trap.c revision 1.33
1/* $NetBSD: trap.c,v 1.33 2006/05/14 21:56:32 elad Exp $ */ 2 3/* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38/* 39 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 40 * Copyright (C) 1995, 1996 TooLs GmbH. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by TooLs GmbH. 54 * 4. The name of TooLs GmbH may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 61 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 62 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 63 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 64 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 65 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 66 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69#include <sys/cdefs.h> 70__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.33 2006/05/14 21:56:32 elad Exp $"); 71 72#include "opt_altivec.h" 73#include "opt_ddb.h" 74 75#include <sys/param.h> 76#include <sys/proc.h> 77#include <sys/reboot.h> 78#include <sys/syscall.h> 79#include <sys/systm.h> 80#include <sys/user.h> 81#include <sys/pool.h> 82#include <sys/sa.h> 83#include <sys/savar.h> 84#include <sys/userret.h> 85 86#include <uvm/uvm_extern.h> 87 88#include <dev/cons.h> 89 90#include <machine/cpu.h> 91#include <machine/db_machdep.h> 92#include <machine/fpu.h> 93#include <machine/frame.h> 94#include <machine/pcb.h> 95#include <machine/psl.h> 96#include <machine/trap.h> 97 98#include <powerpc/spr.h> 99#include <powerpc/ibm4xx/pmap.h> 100#include <powerpc/ibm4xx/tlb.h> 101#include <powerpc/fpu/fpu_extern.h> 102 103/* These definitions should probably be somewhere else XXX */ 104#define FIRSTARG 3 /* first argument is in reg 3 */ 105#define NARGREG 8 /* 8 args are in registers */ 106#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */ 107 108static int fix_unaligned __P((struct lwp *l, struct trapframe *frame)); 109 110void trap __P((struct trapframe *)); /* Called from locore / trap_subr */ 111/* Why are these not defined in a header? */ 112int badaddr __P((void *, size_t)); 113int badaddr_read __P((void *, size_t, int *)); 114int ctx_setup __P((int, int)); 115 116#ifdef DEBUG 117#define TDB_ALL 0x1 118int trapdebug = /* TDB_ALL */ 0; 119#define DBPRINTF(x, y) if (trapdebug & (x)) printf y 120#else 121#define DBPRINTF(x, y) 122#endif 123 124void 125trap(struct trapframe *frame) 126{ 127 struct lwp *l = curlwp; 128 struct proc *p = l ? l->l_proc : NULL; 129 int type = frame->exc; 130 int ftype, rv; 131 ksiginfo_t ksi; 132 133 KASSERT(l == 0 || (l->l_stat == LSONPROC)); 134 135 if (frame->srr1 & PSL_PR) 136 type |= EXC_USER; 137 138 ftype = VM_PROT_READ; 139 140 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 141 type, frame->srr0, frame, &frame)); 142 143 switch (type) { 144 case EXC_DEBUG|EXC_USER: 145 { 146 int srr2, srr3; 147 148 __asm volatile("mfspr %0,0x3f0" : 149 "=r" (rv), "=r" (srr2), "=r" (srr3) :); 150 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, 151 srr3); 152 /* XXX fall through or break here?! */ 153 } 154 /* 155 * DEBUG intr -- probably single-step. 156 */ 157 case EXC_TRC|EXC_USER: 158 frame->srr1 &= ~PSL_SE; 159 KSI_INIT_TRAP(&ksi); 160 ksi.ksi_signo = SIGTRAP; 161 ksi.ksi_trap = EXC_TRC; 162 ksi.ksi_addr = (void *)frame->srr0; 163 KERNEL_PROC_LOCK(l); 164 trapsignal(l, &ksi); 165 KERNEL_PROC_UNLOCK(l); 166 break; 167 168 /* 169 * If we could not find and install appropriate TLB entry, fall through. 170 */ 171 172 case EXC_DSI: 173 /* FALLTHROUGH */ 174 case EXC_DTMISS: 175 { 176 struct vm_map *map; 177 vaddr_t va; 178 struct faultbuf *fb = NULL; 179 180 KERNEL_LOCK(LK_CANRECURSE|LK_EXCLUSIVE); 181 va = frame->dar; 182 if (frame->tf_xtra[TF_PID] == KERNEL_PID) { 183 map = kernel_map; 184 } else { 185 map = &p->p_vmspace->vm_map; 186 if (l->l_flag & L_SA) { 187 l->l_savp->savp_faultaddr = va; 188 l->l_flag |= L_SA_PAGEFAULT; 189 } 190 } 191 192 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 193 ftype = VM_PROT_WRITE; 194 195 DBPRINTF(TDB_ALL, 196 ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 197 frame->srr0, 198 (ftype & VM_PROT_WRITE) ? "write" : "read", 199 (void *)va, frame->tf_xtra[TF_ESR])); 200 rv = uvm_fault(map, trunc_page(va), ftype); 201 KERNEL_UNLOCK(); 202 if (map != kernel_map) 203 l->l_flag &= ~L_SA_PAGEFAULT; 204 if (rv == 0) 205 goto done; 206 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 207 frame->tf_xtra[TF_PID] = KERNEL_PID; 208 frame->srr0 = fb->fb_pc; 209 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 210 frame->fixreg[1] = fb->fb_sp; 211 frame->fixreg[2] = fb->fb_r2; 212 frame->fixreg[3] = 1; /* Return TRUE */ 213 frame->cr = fb->fb_cr; 214 memcpy(&frame->fixreg[13], fb->fb_fixreg, 215 sizeof(fb->fb_fixreg)); 216 goto done; 217 } 218 } 219 goto brain_damage; 220 221 case EXC_DSI|EXC_USER: 222 /* FALLTHROUGH */ 223 case EXC_DTMISS|EXC_USER: 224 KERNEL_PROC_LOCK(l); 225 226 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 227 ftype = VM_PROT_WRITE; 228 229 DBPRINTF(TDB_ALL, 230 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 231 frame->srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 232 frame->dar, frame->tf_xtra[TF_ESR])); 233 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 234 if (l->l_flag & L_SA) { 235 l->l_savp->savp_faultaddr = (vaddr_t)frame->dar; 236 l->l_flag |= L_SA_PAGEFAULT; 237 } 238 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->dar), 239 ftype); 240 if (rv == 0) { 241 l->l_flag &= ~L_SA_PAGEFAULT; 242 KERNEL_PROC_UNLOCK(l); 243 break; 244 } 245 KSI_INIT_TRAP(&ksi); 246 ksi.ksi_signo = SIGSEGV; 247 ksi.ksi_trap = EXC_DSI; 248 ksi.ksi_addr = (void *)frame->dar; 249 if (rv == ENOMEM) { 250 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 251 "out of swap\n", 252 p->p_pid, p->p_comm, l->l_lid, 253 p->p_cred ? 254 kauth_cred_geteuid(p->p_cred) : -1); 255 ksi.ksi_signo = SIGKILL; 256 } 257 trapsignal(l, &ksi); 258 l->l_flag &= ~L_SA_PAGEFAULT; 259 KERNEL_PROC_UNLOCK(l); 260 break; 261 262 case EXC_ITMISS|EXC_USER: 263 case EXC_ISI|EXC_USER: 264 KERNEL_PROC_LOCK(l); 265 if (l->l_flag & L_SA) { 266 l->l_savp->savp_faultaddr = (vaddr_t)frame->srr0; 267 l->l_flag |= L_SA_PAGEFAULT; 268 } 269 ftype = VM_PROT_EXECUTE; 270 DBPRINTF(TDB_ALL, 271 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 272 frame->srr0, frame)); 273 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->srr0), 274 ftype); 275 if (rv == 0) { 276 l->l_flag &= ~L_SA_PAGEFAULT; 277 KERNEL_PROC_UNLOCK(l); 278 break; 279 } 280 KSI_INIT_TRAP(&ksi); 281 ksi.ksi_signo = SIGSEGV; 282 ksi.ksi_trap = EXC_ISI; 283 ksi.ksi_addr = (void *)frame->srr0; 284 ksi.ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 285 trapsignal(l, &ksi); 286 l->l_flag &= ~L_SA_PAGEFAULT; 287 KERNEL_PROC_UNLOCK(l); 288 break; 289 290 case EXC_AST|EXC_USER: 291 curcpu()->ci_astpending = 0; /* we are about to do it */ 292 KERNEL_PROC_LOCK(l); 293 uvmexp.softs++; 294 if (p->p_flag & P_OWEUPC) { 295 p->p_flag &= ~P_OWEUPC; 296 ADDUPROF(p); 297 } 298 /* Check whether we are being preempted. */ 299 if (curcpu()->ci_want_resched) 300 preempt(0); 301 KERNEL_PROC_UNLOCK(l); 302 break; 303 304 305 case EXC_ALI|EXC_USER: 306 KERNEL_PROC_LOCK(l); 307 if (fix_unaligned(l, frame) != 0) { 308 KSI_INIT_TRAP(&ksi); 309 ksi.ksi_signo = SIGBUS; 310 ksi.ksi_trap = EXC_ALI; 311 ksi.ksi_addr = (void *)frame->dar; 312 trapsignal(l, &ksi); 313 } else 314 frame->srr0 += 4; 315 KERNEL_PROC_UNLOCK(l); 316 break; 317 318 case EXC_PGM|EXC_USER: 319 /* 320 * Illegal insn: 321 * 322 * let's try to see if it's FPU and can be emulated. 323 */ 324 uvmexp.traps++; 325 if (!(l->l_addr->u_pcb.pcb_flags & PCB_FPU)) { 326 memset(&l->l_addr->u_pcb.pcb_fpu, 0, 327 sizeof l->l_addr->u_pcb.pcb_fpu); 328 l->l_addr->u_pcb.pcb_flags |= PCB_FPU; 329 } 330 331 if ((rv = fpu_emulate(frame, 332 (struct fpreg *)&l->l_addr->u_pcb.pcb_fpu))) { 333 KSI_INIT_TRAP(&ksi); 334 ksi.ksi_signo = rv; 335 ksi.ksi_trap = EXC_PGM; 336 ksi.ksi_addr = (void *)frame->srr0; 337 KERNEL_PROC_LOCK(l); 338 trapsignal(l, &ksi); 339 KERNEL_PROC_UNLOCK(l); 340 } 341 break; 342 343 case EXC_MCHK: 344 { 345 struct faultbuf *fb; 346 347 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 348 frame->tf_xtra[TF_PID] = KERNEL_PID; 349 frame->srr0 = fb->fb_pc; 350 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 351 frame->fixreg[1] = fb->fb_sp; 352 frame->fixreg[2] = fb->fb_r2; 353 frame->fixreg[3] = 1; /* Return TRUE */ 354 frame->cr = fb->fb_cr; 355 memcpy(&frame->fixreg[13], fb->fb_fixreg, 356 sizeof(fb->fb_fixreg)); 357 goto done; 358 } 359 } 360 goto brain_damage; 361 default: 362 brain_damage: 363 printf("trap type 0x%x at 0x%lx\n", type, frame->srr0); 364#ifdef DDB 365 if (kdb_trap(type, frame)) 366 goto done; 367#endif 368#ifdef TRAP_PANICWAIT 369 printf("Press a key to panic.\n"); 370 cngetc(); 371#endif 372 panic("trap"); 373 } 374 375 /* Invoke MI userret code */ 376 mi_userret(l); 377 378 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 379 done: 380 return; 381} 382 383int 384ctx_setup(int ctx, int srr1) 385{ 386 volatile struct pmap *pm; 387 388 /* Update PID if we're returning to user mode. */ 389 if (srr1 & PSL_PR) { 390 pm = curproc->p_vmspace->vm_map.pmap; 391 if (!pm->pm_ctx) { 392 ctx_alloc(__UNVOLATILE(pm)); 393 } 394 ctx = pm->pm_ctx; 395 if (srr1 & PSL_SE) { 396 int dbreg, mask = 0x48000000; 397 /* 398 * Set the Internal Debug and 399 * Instruction Completion bits of 400 * the DBCR0 register. 401 * 402 * XXX this is also used by jtag debuggers... 403 */ 404 __asm volatile("mfspr %0,0x3f2;" 405 "or %0,%0,%1;" 406 "mtspr 0x3f2,%0;" : 407 "=&r" (dbreg) : "r" (mask)); 408 } 409 } 410 else if (!ctx) { 411 ctx = KERNEL_PID; 412 } 413 return (ctx); 414} 415 416/* 417 * Used by copyin()/copyout() 418 */ 419extern vaddr_t vmaprange __P((struct proc *, vaddr_t, vsize_t, int)); 420extern void vunmaprange __P((vaddr_t, vsize_t)); 421static int bigcopyin __P((const void *, void *, size_t )); 422static int bigcopyout __P((const void *, void *, size_t )); 423 424int 425copyin(const void *udaddr, void *kaddr, size_t len) 426{ 427 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 428 int msr, pid, tmp, ctx; 429 struct faultbuf env; 430 431 /* For bigger buffers use the faster copy */ 432 if (len > 256) 433 return (bigcopyin(udaddr, kaddr, len)); 434 435 if (setfault(&env)) { 436 curpcb->pcb_onfault = 0; 437 return EFAULT; 438 } 439 440 if (!(ctx = pm->pm_ctx)) { 441 /* No context -- assign it one */ 442 ctx_alloc(pm); 443 ctx = pm->pm_ctx; 444 } 445 446 __asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 447 "mfmsr %0;" /* Save MSR */ 448 "li %1,0x20; " 449 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 450 "mfpid %1;" /* Save old PID */ 451 "sync; isync;" 452 453 "1: bdz 2f;" /* while len */ 454 "mtpid %3; sync;" /* Load user ctx */ 455 "lbz %2,0(%4); addi %4,%4,1;" /* Load byte */ 456 "sync; isync;" 457 "mtpid %1;sync;" 458 "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Store kernel byte */ 459 "sync; isync;" 460 "b 1b;" /* repeat */ 461 462 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 463 "sync; isync;" 464 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 465 : "r" (ctx), "b" (udaddr), "b" (kaddr), "b" (len)); 466 467 curpcb->pcb_onfault = 0; 468 return 0; 469} 470 471static int 472bigcopyin(const void *udaddr, void *kaddr, size_t len) 473{ 474 const char *up; 475 char *kp = kaddr; 476 struct lwp *l = curlwp; 477 struct proc *p; 478 int error; 479 480 if (!l) { 481 return EFAULT; 482 } 483 484 p = l->l_proc; 485 486 /* 487 * Stolen from physio(): 488 */ 489 PHOLD(l); 490 error = uvm_vslock(p, __UNCONST(udaddr), len, VM_PROT_READ); 491 if (error) { 492 PRELE(l); 493 return EFAULT; 494 } 495 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 496 497 memcpy(kp, up, len); 498 vunmaprange((vaddr_t)up, len); 499 uvm_vsunlock(p, __UNCONST(udaddr), len); 500 PRELE(l); 501 502 return 0; 503} 504 505int 506copyout(const void *kaddr, void *udaddr, size_t len) 507{ 508 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 509 int msr, pid, tmp, ctx; 510 struct faultbuf env; 511 512 /* For big copies use more efficient routine */ 513 if (len > 256) 514 return (bigcopyout(kaddr, udaddr, len)); 515 516 if (setfault(&env)) { 517 curpcb->pcb_onfault = 0; 518 return EFAULT; 519 } 520 521 if (!(ctx = pm->pm_ctx)) { 522 /* No context -- assign it one */ 523 ctx_alloc(pm); 524 ctx = pm->pm_ctx; 525 } 526 527 __asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 528 "mfmsr %0;" /* Save MSR */ 529 "li %1,0x20; " 530 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 531 "mfpid %1;" /* Save old PID */ 532 "sync; isync;" 533 534 "1: bdz 2f;" /* while len */ 535 "mtpid %1;sync;" 536 "lbz %2,0(%5); addi %5,%5,1;" /* Load kernel byte */ 537 "sync; isync;" 538 "mtpid %3; sync;" /* Load user ctx */ 539 "stb %2,0(%4); dcbf 0,%4; addi %4,%4,1;" /* Store user byte */ 540 "sync; isync;" 541 "b 1b;" /* repeat */ 542 543 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 544 "sync; isync;" 545 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 546 : "r" (ctx), "b" (udaddr), "b" (kaddr), "b" (len)); 547 548 curpcb->pcb_onfault = 0; 549 return 0; 550} 551 552static int 553bigcopyout(const void *kaddr, void *udaddr, size_t len) 554{ 555 char *up; 556 const char *kp = (const char *)kaddr; 557 struct lwp *l = curlwp; 558 struct proc *p; 559 int error; 560 561 if (!l) { 562 return EFAULT; 563 } 564 565 p = l->l_proc; 566 567 /* 568 * Stolen from physio(): 569 */ 570 PHOLD(l); 571 error = uvm_vslock(p, udaddr, len, VM_PROT_WRITE); 572 if (error) { 573 PRELE(l); 574 return EFAULT; 575 } 576 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 577 VM_PROT_READ | VM_PROT_WRITE); 578 579 memcpy(up, kp, len); 580 vunmaprange((vaddr_t)up, len); 581 uvm_vsunlock(p, udaddr, len); 582 PRELE(l); 583 584 return 0; 585} 586 587/* 588 * kcopy(const void *src, void *dst, size_t len); 589 * 590 * Copy len bytes from src to dst, aborting if we encounter a fatal 591 * page fault. 592 * 593 * kcopy() _must_ save and restore the old fault handler since it is 594 * called by uiomove(), which may be in the path of servicing a non-fatal 595 * page fault. 596 */ 597int 598kcopy(const void *src, void *dst, size_t len) 599{ 600 struct faultbuf env, *oldfault; 601 602 oldfault = curpcb->pcb_onfault; 603 if (setfault(&env)) { 604 curpcb->pcb_onfault = oldfault; 605 return EFAULT; 606 } 607 608 memcpy(dst, src, len); 609 610 curpcb->pcb_onfault = oldfault; 611 return 0; 612} 613 614int 615badaddr(void *addr, size_t size) 616{ 617 618 return badaddr_read(addr, size, NULL); 619} 620 621int 622badaddr_read(void *addr, size_t size, int *rptr) 623{ 624 struct faultbuf env; 625 int x; 626 627 /* Get rid of any stale machine checks that have been waiting. */ 628 __asm volatile ("sync; isync"); 629 630 if (setfault(&env)) { 631 curpcb->pcb_onfault = 0; 632 __asm volatile ("sync"); 633 return 1; 634 } 635 636 __asm volatile ("sync"); 637 638 switch (size) { 639 case 1: 640 x = *(volatile int8_t *)addr; 641 break; 642 case 2: 643 x = *(volatile int16_t *)addr; 644 break; 645 case 4: 646 x = *(volatile int32_t *)addr; 647 break; 648 default: 649 panic("badaddr: invalid size (%d)", size); 650 } 651 652 /* Make sure we took the machine check, if we caused one. */ 653 __asm volatile ("sync; isync"); 654 655 curpcb->pcb_onfault = 0; 656 __asm volatile ("sync"); /* To be sure. */ 657 658 /* Use the value to avoid reorder. */ 659 if (rptr) 660 *rptr = x; 661 662 return 0; 663} 664 665/* 666 * For now, this only deals with the particular unaligned access case 667 * that gcc tends to generate. Eventually it should handle all of the 668 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 669 */ 670 671static int 672fix_unaligned(struct lwp *l, struct trapframe *frame) 673{ 674 675 return -1; 676} 677 678/* 679 * Start a new LWP 680 */ 681void 682startlwp(arg) 683 void *arg; 684{ 685 int err; 686 ucontext_t *uc = arg; 687 struct lwp *l = curlwp; 688 689 err = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); 690#if DIAGNOSTIC 691 if (err) { 692 printf("Error %d from cpu_setmcontext.", err); 693 } 694#endif 695 pool_put(&lwp_uc_pool, uc); 696 697 upcallret(l); 698} 699 700/* 701 * XXX This is a terrible name. 702 */ 703void 704upcallret(l) 705 struct lwp *l; 706{ 707 708 /* Invoke MI userret code */ 709 mi_userret(l); 710 711 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 712} 713