| support.s (271071) | support.s (274648) |
|---|---|
| 1/*- 2 * Copyright (c) 1993 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 12 unchanged lines hidden (view full) --- 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 27 * SUCH DAMAGE. 28 * | 1/*- 2 * Copyright (c) 1993 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 12 unchanged lines hidden (view full) --- 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 27 * SUCH DAMAGE. 28 * |
| 29 * $FreeBSD: stable/10/sys/i386/i386/support.s 271071 2014-09-04 00:40:41Z pfg $ | 29 * $FreeBSD: stable/10/sys/i386/i386/support.s 274648 2014-11-18 12:53:32Z kib $ |
| 30 */ 31 32#include "opt_npx.h" 33 34#include <machine/asmacros.h> 35#include <machine/cputypes.h> 36#include <machine/intr_machdep.h> 37#include <machine/pmap.h> --- 346 unchanged lines hidden (view full) --- 384 popl %edi 385 popl %esi 386 movl PCPU(CURPCB),%edx 387 movl $0,PCB_ONFAULT(%edx) 388 movl $EFAULT,%eax 389 ret 390 391/* | 30 */ 31 32#include "opt_npx.h" 33 34#include <machine/asmacros.h> 35#include <machine/cputypes.h> 36#include <machine/intr_machdep.h> 37#include <machine/pmap.h> --- 346 unchanged lines hidden (view full) --- 384 popl %edi 385 popl %esi 386 movl PCPU(CURPCB),%edx 387 movl $0,PCB_ONFAULT(%edx) 388 movl $EFAULT,%eax 389 ret 390 391/* |
| 392 * casuword. Compare and set user word. Returns -1 or the current value. | 392 * casueword. Compare and set user word. Returns -1 on fault, 393 * 0 on non-faulting access. The current value is in *oldp. |
| 393 */ | 394 */ |
| 394 395ALTENTRY(casuword32) 396ENTRY(casuword) | 395ALTENTRY(casueword32) 396ENTRY(casueword) |
| 397 movl PCPU(CURPCB),%ecx 398 movl $fusufault,PCB_ONFAULT(%ecx) 399 movl 4(%esp),%edx /* dst */ 400 movl 8(%esp),%eax /* old */ | 397 movl PCPU(CURPCB),%ecx 398 movl $fusufault,PCB_ONFAULT(%ecx) 399 movl 4(%esp),%edx /* dst */ 400 movl 8(%esp),%eax /* old */ |
| 401 movl 12(%esp),%ecx /* new */ | 401 movl 16(%esp),%ecx /* new */ |
| 402 403 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address is valid */ 404 ja fusufault 405 406#ifdef SMP 407 lock 408#endif 409 cmpxchgl %ecx,(%edx) /* Compare and set. */ 410 411 /* 412 * The old value is in %eax. If the store succeeded it will be the 413 * value we expected (old) from before the store, otherwise it will 414 * be the current value. 415 */ 416 417 movl PCPU(CURPCB),%ecx 418 movl $0,PCB_ONFAULT(%ecx) | 402 403 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address is valid */ 404 ja fusufault 405 406#ifdef SMP 407 lock 408#endif 409 cmpxchgl %ecx,(%edx) /* Compare and set. */ 410 411 /* 412 * The old value is in %eax. If the store succeeded it will be the 413 * value we expected (old) from before the store, otherwise it will 414 * be the current value. 415 */ 416 417 movl PCPU(CURPCB),%ecx 418 movl $0,PCB_ONFAULT(%ecx) |
| 419 movl 12(%esp),%edx /* oldp */ 420 movl %eax,(%edx) 421 xorl %eax,%eax |
|
| 419 ret | 422 ret |
| 420END(casuword32) 421END(casuword) | 423END(casueword32) 424END(casueword) |
| 422 423/* 424 * Fetch (load) a 32-bit word, a 16-bit word, or an 8-bit byte from user | 425 426/* 427 * Fetch (load) a 32-bit word, a 16-bit word, or an 8-bit byte from user |
| 425 * memory. All these functions are MPSAFE. | 428 * memory. |
| 426 */ 427 | 429 */ 430 |
| 428ALTENTRY(fuword32) 429ENTRY(fuword) | 431ALTENTRY(fueword32) 432ENTRY(fueword) |
| 430 movl PCPU(CURPCB),%ecx 431 movl $fusufault,PCB_ONFAULT(%ecx) 432 movl 4(%esp),%edx /* from */ 433 434 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address is valid */ 435 ja fusufault 436 437 movl (%edx),%eax 438 movl $0,PCB_ONFAULT(%ecx) | 433 movl PCPU(CURPCB),%ecx 434 movl $fusufault,PCB_ONFAULT(%ecx) 435 movl 4(%esp),%edx /* from */ 436 437 cmpl $VM_MAXUSER_ADDRESS-4,%edx /* verify address is valid */ 438 ja fusufault 439 440 movl (%edx),%eax 441 movl $0,PCB_ONFAULT(%ecx) |
| 442 movl 8(%esp),%edx 443 movl %eax,(%edx) 444 xorl %eax,%eax |
|
| 439 ret | 445 ret |
| 440END(fuword32) 441END(fuword) | 446END(fueword32) 447END(fueword) |
| 442 443/* 444 * fuswintr() and suswintr() are specialized variants of fuword16() and 445 * suword16(), respectively. They are called from the profiling code, 446 * potentially at interrupt time. If they fail, that's okay; good things 447 * will happen later. They always fail for now, until the trap code is 448 * able to deal with this. 449 */ --- 382 unchanged lines hidden --- | 448 449/* 450 * fuswintr() and suswintr() are specialized variants of fuword16() and 451 * suword16(), respectively. They are called from the profiling code, 452 * potentially at interrupt time. If they fail, that's okay; good things 453 * will happen later. They always fail for now, until the trap code is 454 * able to deal with this. 455 */ --- 382 unchanged lines hidden --- |