trap.c revision 1.29
1/* $NetBSD: trap.c,v 1.29 2005/12/24 22:45:36 perry 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 1.29 2005/12/24 22:45:36 perry Exp $"); 71 72#include "opt_altivec.h" 73#include "opt_ddb.h" 74#include "opt_ktrace.h" 75#include "opt_systrace.h" 76#include "opt_syscall_debug.h" 77 78#include <sys/param.h> 79#include <sys/proc.h> 80#include <sys/reboot.h> 81#include <sys/syscall.h> 82#include <sys/systm.h> 83#include <sys/user.h> 84#ifdef KTRACE 85#include <sys/ktrace.h> 86#endif 87#include <sys/pool.h> 88#include <sys/sa.h> 89#include <sys/savar.h> 90#ifdef SYSTRACE 91#include <sys/systrace.h> 92#endif 93#include <sys/userret.h> 94 95#include <uvm/uvm_extern.h> 96 97#include <dev/cons.h> 98 99#include <machine/cpu.h> 100#include <machine/db_machdep.h> 101#include <machine/fpu.h> 102#include <machine/frame.h> 103#include <machine/pcb.h> 104#include <machine/psl.h> 105#include <machine/trap.h> 106 107#include <powerpc/spr.h> 108#include <powerpc/ibm4xx/pmap.h> 109#include <powerpc/ibm4xx/tlb.h> 110#include <powerpc/fpu/fpu_extern.h> 111 112/* These definitions should probably be somewhere else XXX */ 113#define FIRSTARG 3 /* first argument is in reg 3 */ 114#define NARGREG 8 /* 8 args are in registers */ 115#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */ 116 117static int fix_unaligned __P((struct lwp *l, struct trapframe *frame)); 118 119void trap __P((struct trapframe *)); /* Called from locore / trap_subr */ 120/* Why are these not defined in a header? */ 121int badaddr __P((void *, size_t)); 122int badaddr_read __P((void *, size_t, int *)); 123int ctx_setup __P((int, int)); 124 125#ifdef DEBUG 126#define TDB_ALL 0x1 127int trapdebug = /* TDB_ALL */ 0; 128#define DBPRINTF(x, y) if (trapdebug & (x)) printf y 129#else 130#define DBPRINTF(x, y) 131#endif 132 133void 134trap(struct trapframe *frame) 135{ 136 struct lwp *l = curlwp; 137 struct proc *p = l ? l->l_proc : NULL; 138 int type = frame->exc; 139 int ftype, rv; 140 ksiginfo_t ksi; 141 142 KASSERT(l == 0 || (l->l_stat == LSONPROC)); 143 144 if (frame->srr1 & PSL_PR) 145 type |= EXC_USER; 146 147 ftype = VM_PROT_READ; 148 149 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 150 type, frame->srr0, frame, &frame)); 151 152 switch (type) { 153 case EXC_DEBUG|EXC_USER: 154 { 155 int srr2, srr3; 156 157 __asm volatile("mfspr %0,0x3f0" : 158 "=r" (rv), "=r" (srr2), "=r" (srr3) :); 159 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, 160 srr3); 161 /* XXX fall through or break here?! */ 162 } 163 /* 164 * DEBUG intr -- probably single-step. 165 */ 166 case EXC_TRC|EXC_USER: 167 frame->srr1 &= ~PSL_SE; 168 KSI_INIT_TRAP(&ksi); 169 ksi.ksi_signo = SIGTRAP; 170 ksi.ksi_trap = EXC_TRC; 171 ksi.ksi_addr = (void *)frame->srr0; 172 KERNEL_PROC_LOCK(l); 173 trapsignal(l, &ksi); 174 KERNEL_PROC_UNLOCK(l); 175 break; 176 177 /* 178 * If we could not find and install appropriate TLB entry, fall through. 179 */ 180 181 case EXC_DSI: 182 /* FALLTHROUGH */ 183 case EXC_DTMISS: 184 { 185 struct vm_map *map; 186 vaddr_t va; 187 struct faultbuf *fb = NULL; 188 189 KERNEL_LOCK(LK_CANRECURSE|LK_EXCLUSIVE); 190 va = frame->dar; 191 if (frame->tf_xtra[TF_PID] == KERNEL_PID) { 192 map = kernel_map; 193 } else { 194 map = &p->p_vmspace->vm_map; 195 if (l->l_flag & L_SA) { 196 l->l_savp->savp_faultaddr = va; 197 l->l_flag |= L_SA_PAGEFAULT; 198 } 199 } 200 201 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 202 ftype = VM_PROT_WRITE; 203 204 DBPRINTF(TDB_ALL, 205 ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 206 frame->srr0, 207 (ftype & VM_PROT_WRITE) ? "write" : "read", 208 (void *)va, frame->tf_xtra[TF_ESR])); 209 rv = uvm_fault(map, trunc_page(va), 0, ftype); 210 KERNEL_UNLOCK(); 211 if (map != kernel_map) 212 l->l_flag &= ~L_SA_PAGEFAULT; 213 if (rv == 0) 214 goto done; 215 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 216 frame->tf_xtra[TF_PID] = KERNEL_PID; 217 frame->srr0 = fb->fb_pc; 218 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 219 frame->fixreg[1] = fb->fb_sp; 220 frame->fixreg[2] = fb->fb_r2; 221 frame->fixreg[3] = 1; /* Return TRUE */ 222 frame->cr = fb->fb_cr; 223 memcpy(&frame->fixreg[13], fb->fb_fixreg, 224 sizeof(fb->fb_fixreg)); 225 goto done; 226 } 227 } 228 goto brain_damage; 229 230 case EXC_DSI|EXC_USER: 231 /* FALLTHROUGH */ 232 case EXC_DTMISS|EXC_USER: 233 KERNEL_PROC_LOCK(l); 234 235 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 236 ftype = VM_PROT_WRITE; 237 238 DBPRINTF(TDB_ALL, 239 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 240 frame->srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 241 frame->dar, frame->tf_xtra[TF_ESR])); 242 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 243 if (l->l_flag & L_SA) { 244 l->l_savp->savp_faultaddr = (vaddr_t)frame->dar; 245 l->l_flag |= L_SA_PAGEFAULT; 246 } 247 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->dar), 248 0, ftype); 249 if (rv == 0) { 250 l->l_flag &= ~L_SA_PAGEFAULT; 251 KERNEL_PROC_UNLOCK(l); 252 break; 253 } 254 KSI_INIT_TRAP(&ksi); 255 ksi.ksi_signo = SIGSEGV; 256 ksi.ksi_trap = EXC_DSI; 257 ksi.ksi_addr = (void *)frame->dar; 258 if (rv == ENOMEM) { 259 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 260 "out of swap\n", 261 p->p_pid, p->p_comm, l->l_lid, 262 p->p_cred && p->p_ucred ? 263 p->p_ucred->cr_uid : -1); 264 ksi.ksi_signo = SIGKILL; 265 } 266 trapsignal(l, &ksi); 267 l->l_flag &= ~L_SA_PAGEFAULT; 268 KERNEL_PROC_UNLOCK(l); 269 break; 270 271 case EXC_ITMISS|EXC_USER: 272 case EXC_ISI|EXC_USER: 273 KERNEL_PROC_LOCK(l); 274 if (l->l_flag & L_SA) { 275 l->l_savp->savp_faultaddr = (vaddr_t)frame->srr0; 276 l->l_flag |= L_SA_PAGEFAULT; 277 } 278 ftype = VM_PROT_EXECUTE; 279 DBPRINTF(TDB_ALL, 280 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 281 frame->srr0, frame)); 282 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->srr0), 283 0, ftype); 284 if (rv == 0) { 285 l->l_flag &= ~L_SA_PAGEFAULT; 286 KERNEL_PROC_UNLOCK(l); 287 break; 288 } 289 KSI_INIT_TRAP(&ksi); 290 ksi.ksi_signo = SIGSEGV; 291 ksi.ksi_trap = EXC_ISI; 292 ksi.ksi_addr = (void *)frame->srr0; 293 ksi.ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 294 trapsignal(l, &ksi); 295 l->l_flag &= ~L_SA_PAGEFAULT; 296 KERNEL_PROC_UNLOCK(l); 297 break; 298 299 case EXC_AST|EXC_USER: 300 curcpu()->ci_astpending = 0; /* we are about to do it */ 301 KERNEL_PROC_LOCK(l); 302 uvmexp.softs++; 303 if (p->p_flag & P_OWEUPC) { 304 p->p_flag &= ~P_OWEUPC; 305 ADDUPROF(p); 306 } 307 /* Check whether we are being preempted. */ 308 if (curcpu()->ci_want_resched) 309 preempt(0); 310 KERNEL_PROC_UNLOCK(l); 311 break; 312 313 314 case EXC_ALI|EXC_USER: 315 KERNEL_PROC_LOCK(l); 316 if (fix_unaligned(l, frame) != 0) { 317 KSI_INIT_TRAP(&ksi); 318 ksi.ksi_signo = SIGBUS; 319 ksi.ksi_trap = EXC_ALI; 320 ksi.ksi_addr = (void *)frame->dar; 321 trapsignal(l, &ksi); 322 } else 323 frame->srr0 += 4; 324 KERNEL_PROC_UNLOCK(l); 325 break; 326 327 case EXC_PGM|EXC_USER: 328 /* 329 * Illegal insn: 330 * 331 * let's try to see if it's FPU and can be emulated. 332 */ 333 uvmexp.traps++; 334 if (!(l->l_addr->u_pcb.pcb_flags & PCB_FPU)) { 335 memset(&l->l_addr->u_pcb.pcb_fpu, 0, 336 sizeof l->l_addr->u_pcb.pcb_fpu); 337 l->l_addr->u_pcb.pcb_flags |= PCB_FPU; 338 } 339 340 if ((rv = fpu_emulate(frame, 341 (struct fpreg *)&l->l_addr->u_pcb.pcb_fpu))) { 342 KSI_INIT_TRAP(&ksi); 343 ksi.ksi_signo = rv; 344 ksi.ksi_trap = EXC_PGM; 345 ksi.ksi_addr = (void *)frame->srr0; 346 KERNEL_PROC_LOCK(l); 347 trapsignal(l, &ksi); 348 KERNEL_PROC_UNLOCK(l); 349 } 350 break; 351 352 case EXC_MCHK: 353 { 354 struct faultbuf *fb; 355 356 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 357 frame->tf_xtra[TF_PID] = KERNEL_PID; 358 frame->srr0 = fb->fb_pc; 359 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 360 frame->fixreg[1] = fb->fb_sp; 361 frame->fixreg[2] = fb->fb_r2; 362 frame->fixreg[3] = 1; /* Return TRUE */ 363 frame->cr = fb->fb_cr; 364 memcpy(&frame->fixreg[13], fb->fb_fixreg, 365 sizeof(fb->fb_fixreg)); 366 goto done; 367 } 368 } 369 goto brain_damage; 370 default: 371 brain_damage: 372 printf("trap type 0x%x at 0x%lx\n", type, frame->srr0); 373#ifdef DDB 374 if (kdb_trap(type, frame)) 375 goto done; 376#endif 377#ifdef TRAP_PANICWAIT 378 printf("Press a key to panic.\n"); 379 cngetc(); 380#endif 381 panic("trap"); 382 } 383 384 /* Invoke MI userret code */ 385 mi_userret(l); 386 387 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 388 done: 389 return; 390} 391 392int 393ctx_setup(int ctx, int srr1) 394{ 395 volatile struct pmap *pm; 396 397 /* Update PID if we're returning to user mode. */ 398 if (srr1 & PSL_PR) { 399 pm = curproc->p_vmspace->vm_map.pmap; 400 if (!pm->pm_ctx) { 401 ctx_alloc(__UNVOLATILE(pm)); 402 } 403 ctx = pm->pm_ctx; 404 if (srr1 & PSL_SE) { 405 int dbreg, mask = 0x48000000; 406 /* 407 * Set the Internal Debug and 408 * Instruction Completion bits of 409 * the DBCR0 register. 410 * 411 * XXX this is also used by jtag debuggers... 412 */ 413 __asm volatile("mfspr %0,0x3f2;" 414 "or %0,%0,%1;" 415 "mtspr 0x3f2,%0;" : 416 "=&r" (dbreg) : "r" (mask)); 417 } 418 } 419 else if (!ctx) { 420 ctx = KERNEL_PID; 421 } 422 return (ctx); 423} 424 425/* 426 * Used by copyin()/copyout() 427 */ 428extern vaddr_t vmaprange __P((struct proc *, vaddr_t, vsize_t, int)); 429extern void vunmaprange __P((vaddr_t, vsize_t)); 430static int bigcopyin __P((const void *, void *, size_t )); 431static int bigcopyout __P((const void *, void *, size_t )); 432 433int 434copyin(const void *udaddr, void *kaddr, size_t len) 435{ 436 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 437 int msr, pid, tmp, ctx; 438 struct faultbuf env; 439 440 /* For bigger buffers use the faster copy */ 441 if (len > 256) 442 return (bigcopyin(udaddr, kaddr, len)); 443 444 if (setfault(&env)) { 445 curpcb->pcb_onfault = 0; 446 return EFAULT; 447 } 448 449 if (!(ctx = pm->pm_ctx)) { 450 /* No context -- assign it one */ 451 ctx_alloc(pm); 452 ctx = pm->pm_ctx; 453 } 454 455 __asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 456 "mfmsr %0;" /* Save MSR */ 457 "li %1,0x20; " 458 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 459 "mfpid %1;" /* Save old PID */ 460 "sync; isync;" 461 462 "1: bdz 2f;" /* while len */ 463 "mtpid %3; sync;" /* Load user ctx */ 464 "lbz %2,0(%4); addi %4,%4,1;" /* Load byte */ 465 "sync; isync;" 466 "mtpid %1;sync;" 467 "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Store kernel byte */ 468 "sync; isync;" 469 "b 1b;" /* repeat */ 470 471 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 472 "sync; isync;" 473 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 474 : "r" (ctx), "b" (udaddr), "b" (kaddr), "b" (len)); 475 476 curpcb->pcb_onfault = 0; 477 return 0; 478} 479 480static int 481bigcopyin(const void *udaddr, void *kaddr, size_t len) 482{ 483 const char *up; 484 char *kp = kaddr; 485 struct lwp *l = curlwp; 486 struct proc *p; 487 int error; 488 489 if (!l) { 490 return EFAULT; 491 } 492 493 p = l->l_proc; 494 495 /* 496 * Stolen from physio(): 497 */ 498 PHOLD(l); 499 error = uvm_vslock(p, __UNCONST(udaddr), len, VM_PROT_READ); 500 if (error) { 501 PRELE(l); 502 return EFAULT; 503 } 504 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 505 506 memcpy(kp, up, len); 507 vunmaprange((vaddr_t)up, len); 508 uvm_vsunlock(p, __UNCONST(udaddr), len); 509 PRELE(l); 510 511 return 0; 512} 513 514int 515copyout(const void *kaddr, void *udaddr, size_t len) 516{ 517 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 518 int msr, pid, tmp, ctx; 519 struct faultbuf env; 520 521 /* For big copies use more efficient routine */ 522 if (len > 256) 523 return (bigcopyout(kaddr, udaddr, len)); 524 525 if (setfault(&env)) { 526 curpcb->pcb_onfault = 0; 527 return EFAULT; 528 } 529 530 if (!(ctx = pm->pm_ctx)) { 531 /* No context -- assign it one */ 532 ctx_alloc(pm); 533 ctx = pm->pm_ctx; 534 } 535 536 __asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 537 "mfmsr %0;" /* Save MSR */ 538 "li %1,0x20; " 539 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 540 "mfpid %1;" /* Save old PID */ 541 "sync; isync;" 542 543 "1: bdz 2f;" /* while len */ 544 "mtpid %1;sync;" 545 "lbz %2,0(%5); addi %5,%5,1;" /* Load kernel byte */ 546 "sync; isync;" 547 "mtpid %3; sync;" /* Load user ctx */ 548 "stb %2,0(%4); dcbf 0,%4; addi %4,%4,1;" /* Store user byte */ 549 "sync; isync;" 550 "b 1b;" /* repeat */ 551 552 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 553 "sync; isync;" 554 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 555 : "r" (ctx), "b" (udaddr), "b" (kaddr), "b" (len)); 556 557 curpcb->pcb_onfault = 0; 558 return 0; 559} 560 561static int 562bigcopyout(const void *kaddr, void *udaddr, size_t len) 563{ 564 char *up; 565 const char *kp = (const char *)kaddr; 566 struct lwp *l = curlwp; 567 struct proc *p; 568 int error; 569 570 if (!l) { 571 return EFAULT; 572 } 573 574 p = l->l_proc; 575 576 /* 577 * Stolen from physio(): 578 */ 579 PHOLD(l); 580 error = uvm_vslock(p, udaddr, len, VM_PROT_WRITE); 581 if (error) { 582 PRELE(l); 583 return EFAULT; 584 } 585 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 586 VM_PROT_READ | VM_PROT_WRITE); 587 588 memcpy(up, kp, len); 589 vunmaprange((vaddr_t)up, len); 590 uvm_vsunlock(p, udaddr, len); 591 PRELE(l); 592 593 return 0; 594} 595 596/* 597 * kcopy(const void *src, void *dst, size_t len); 598 * 599 * Copy len bytes from src to dst, aborting if we encounter a fatal 600 * page fault. 601 * 602 * kcopy() _must_ save and restore the old fault handler since it is 603 * called by uiomove(), which may be in the path of servicing a non-fatal 604 * page fault. 605 */ 606int 607kcopy(const void *src, void *dst, size_t len) 608{ 609 struct faultbuf env, *oldfault; 610 611 oldfault = curpcb->pcb_onfault; 612 if (setfault(&env)) { 613 curpcb->pcb_onfault = oldfault; 614 return EFAULT; 615 } 616 617 memcpy(dst, src, len); 618 619 curpcb->pcb_onfault = oldfault; 620 return 0; 621} 622 623int 624badaddr(void *addr, size_t size) 625{ 626 627 return badaddr_read(addr, size, NULL); 628} 629 630int 631badaddr_read(void *addr, size_t size, int *rptr) 632{ 633 struct faultbuf env; 634 int x; 635 636 /* Get rid of any stale machine checks that have been waiting. */ 637 __asm volatile ("sync; isync"); 638 639 if (setfault(&env)) { 640 curpcb->pcb_onfault = 0; 641 __asm volatile ("sync"); 642 return 1; 643 } 644 645 __asm volatile ("sync"); 646 647 switch (size) { 648 case 1: 649 x = *(volatile int8_t *)addr; 650 break; 651 case 2: 652 x = *(volatile int16_t *)addr; 653 break; 654 case 4: 655 x = *(volatile int32_t *)addr; 656 break; 657 default: 658 panic("badaddr: invalid size (%d)", size); 659 } 660 661 /* Make sure we took the machine check, if we caused one. */ 662 __asm volatile ("sync; isync"); 663 664 curpcb->pcb_onfault = 0; 665 __asm volatile ("sync"); /* To be sure. */ 666 667 /* Use the value to avoid reorder. */ 668 if (rptr) 669 *rptr = x; 670 671 return 0; 672} 673 674/* 675 * For now, this only deals with the particular unaligned access case 676 * that gcc tends to generate. Eventually it should handle all of the 677 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 678 */ 679 680static int 681fix_unaligned(struct lwp *l, struct trapframe *frame) 682{ 683 684 return -1; 685} 686 687/* 688 * Start a new LWP 689 */ 690void 691startlwp(arg) 692 void *arg; 693{ 694 int err; 695 ucontext_t *uc = arg; 696 struct lwp *l = curlwp; 697 698 err = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); 699#if DIAGNOSTIC 700 if (err) { 701 printf("Error %d from cpu_setmcontext.", err); 702 } 703#endif 704 pool_put(&lwp_uc_pool, uc); 705 706 upcallret(l); 707} 708 709/* 710 * XXX This is a terrible name. 711 */ 712void 713upcallret(l) 714 struct lwp *l; 715{ 716 717 /* Invoke MI userret code */ 718 mi_userret(l); 719 720 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 721} 722