trap.c revision 1.20
1 /* $NetBSD: trap.c,v 1.20 2003/10/31 16:44:35 cl 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 1.20 2003/10/31 16:44:35 cl 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 */ 116 117 static int fix_unaligned __P((struct lwp *l, struct trapframe *frame)); 118 119 void trap __P((struct trapframe *)); /* Called from locore / trap_subr */ 120 /* Why are these not defined in a header? */ 121 int badaddr __P((void *, size_t)); 122 int badaddr_read __P((void *, size_t, int *)); 123 int ctx_setup __P((int, int)); 124 125 #ifdef DEBUG 126 #define TDB_ALL 0x1 127 int trapdebug = /* TDB_ALL */ 0; 128 #define DBPRINTF(x, y) if (trapdebug & (x)) printf y 129 #else 130 #define DBPRINTF(x, y) 131 #endif 132 133 void 134 trap(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 KDASSERT(p != NULL && p->p_sa != NULL); 197 p->p_sa->sa_vp_faultaddr = va; 198 l->l_flag |= L_SA_PAGEFAULT; 199 } 200 } 201 202 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 203 ftype = VM_PROT_WRITE; 204 205 DBPRINTF(TDB_ALL, 206 ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 207 frame->srr0, 208 (ftype & VM_PROT_WRITE) ? "write" : "read", 209 (void *)va, frame->tf_xtra[TF_ESR])); 210 rv = uvm_fault(map, trunc_page(va), 0, ftype); 211 KERNEL_UNLOCK(); 212 if (map != kernel_map) 213 l->l_flag &= ~L_SA_PAGEFAULT; 214 if (rv == 0) 215 goto done; 216 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 217 frame->tf_xtra[TF_PID] = KERNEL_PID; 218 frame->srr0 = fb->fb_pc; 219 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 220 frame->fixreg[1] = fb->fb_sp; 221 frame->fixreg[2] = fb->fb_r2; 222 frame->fixreg[3] = 1; /* Return TRUE */ 223 frame->cr = fb->fb_cr; 224 memcpy(&frame->fixreg[13], fb->fb_fixreg, 225 sizeof(fb->fb_fixreg)); 226 goto done; 227 } 228 } 229 goto brain_damage; 230 231 case EXC_DSI|EXC_USER: 232 /* FALLTHROUGH */ 233 case EXC_DTMISS|EXC_USER: 234 KERNEL_PROC_LOCK(l); 235 236 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 237 ftype = VM_PROT_WRITE; 238 239 DBPRINTF(TDB_ALL, 240 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 241 frame->srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 242 frame->dar, frame->tf_xtra[TF_ESR])); 243 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 244 if (l->l_flag & L_SA) { 245 KDASSERT(p != NULL && p->p_sa != NULL); 246 p->p_sa->sa_vp_faultaddr = (vaddr_t)frame->dar; 247 l->l_flag |= L_SA_PAGEFAULT; 248 } 249 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->dar), 250 0, ftype); 251 if (rv == 0) { 252 l->l_flag &= ~L_SA_PAGEFAULT; 253 KERNEL_PROC_UNLOCK(l); 254 break; 255 } 256 KSI_INIT_TRAP(&ksi); 257 ksi.ksi_signo = SIGSEGV; 258 ksi.ksi_trap = EXC_DSI; 259 ksi.ksi_addr = (void *)frame->dar; 260 if (rv == ENOMEM) { 261 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 262 "out of swap\n", 263 p->p_pid, p->p_comm, l->l_lid, 264 p->p_cred && p->p_ucred ? 265 p->p_ucred->cr_uid : -1); 266 ksi.ksi_signo = SIGKILL; 267 } 268 trapsignal(l, &ksi); 269 l->l_flag &= ~L_SA_PAGEFAULT; 270 KERNEL_PROC_UNLOCK(l); 271 break; 272 273 case EXC_ITMISS|EXC_USER: 274 case EXC_ISI|EXC_USER: 275 KERNEL_PROC_LOCK(l); 276 if (l->l_flag & L_SA) { 277 KDASSERT(p != NULL && p->p_sa != NULL); 278 p->p_sa->sa_vp_faultaddr = (vaddr_t)frame->srr0; 279 l->l_flag |= L_SA_PAGEFAULT; 280 } 281 ftype = VM_PROT_EXECUTE; 282 DBPRINTF(TDB_ALL, 283 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 284 frame->srr0, frame)); 285 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->srr0), 286 0, ftype); 287 if (rv == 0) { 288 l->l_flag &= ~L_SA_PAGEFAULT; 289 KERNEL_PROC_UNLOCK(l); 290 break; 291 } 292 KSI_INIT_TRAP(&ksi); 293 ksi.ksi_signo = SIGSEGV; 294 ksi.ksi_trap = EXC_ISI; 295 ksi.ksi_addr = (void *)frame->srr0; 296 trapsignal(l, &ksi); 297 l->l_flag &= ~L_SA_PAGEFAULT; 298 KERNEL_PROC_UNLOCK(l); 299 break; 300 301 case EXC_AST|EXC_USER: 302 curcpu()->ci_astpending = 0; /* we are about to do it */ 303 KERNEL_PROC_LOCK(l); 304 uvmexp.softs++; 305 if (p->p_flag & P_OWEUPC) { 306 p->p_flag &= ~P_OWEUPC; 307 ADDUPROF(p); 308 } 309 /* Check whether we are being preempted. */ 310 if (curcpu()->ci_want_resched) 311 preempt(0); 312 KERNEL_PROC_UNLOCK(l); 313 break; 314 315 316 case EXC_ALI|EXC_USER: 317 KERNEL_PROC_LOCK(l); 318 if (fix_unaligned(l, frame) != 0) { 319 KSI_INIT_TRAP(&ksi); 320 ksi.ksi_signo = SIGBUS; 321 ksi.ksi_trap = EXC_ALI; 322 ksi.ksi_addr = (void *)frame->dar; 323 trapsignal(l, &ksi); 324 } else 325 frame->srr0 += 4; 326 KERNEL_PROC_UNLOCK(l); 327 break; 328 329 case EXC_PGM|EXC_USER: 330 /* 331 * Illegal insn: 332 * 333 * let's try to see if it's FPU and can be emulated. 334 */ 335 uvmexp.traps ++; 336 if (!(l->l_addr->u_pcb.pcb_flags & PCB_FPU)) { 337 memset(&l->l_addr->u_pcb.pcb_fpu, 0, 338 sizeof l->l_addr->u_pcb.pcb_fpu); 339 l->l_addr->u_pcb.pcb_flags |= PCB_FPU; 340 } 341 342 if ((rv = fpu_emulate(frame, 343 (struct fpreg *)&l->l_addr->u_pcb.pcb_fpu))) { 344 KSI_INIT_TRAP(&ksi); 345 ksi.ksi_signo = rv; 346 ksi.ksi_trap = EXC_PGM; 347 ksi.ksi_addr = (void *)frame->srr0; 348 KERNEL_PROC_LOCK(l); 349 trapsignal(l, &ksi); 350 KERNEL_PROC_UNLOCK(l); 351 } 352 break; 353 354 case EXC_MCHK: 355 { 356 struct faultbuf *fb; 357 358 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 359 frame->tf_xtra[TF_PID] = KERNEL_PID; 360 frame->srr0 = fb->fb_pc; 361 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 362 frame->fixreg[1] = fb->fb_sp; 363 frame->fixreg[2] = fb->fb_r2; 364 frame->fixreg[3] = 1; /* Return TRUE */ 365 frame->cr = fb->fb_cr; 366 memcpy(&frame->fixreg[13], fb->fb_fixreg, 367 sizeof(fb->fb_fixreg)); 368 goto done; 369 } 370 } 371 goto brain_damage; 372 default: 373 brain_damage: 374 printf("trap type 0x%x at 0x%lx\n", type, frame->srr0); 375 #ifdef DDB 376 if (kdb_trap(type, frame)) 377 goto done; 378 #endif 379 #ifdef TRAP_PANICWAIT 380 printf("Press a key to panic.\n"); 381 cngetc(); 382 #endif 383 panic("trap"); 384 } 385 386 /* Invoke MI userret code */ 387 mi_userret(l); 388 389 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 390 done: 391 return; 392 } 393 394 int 395 ctx_setup(int ctx, int srr1) 396 { 397 volatile struct pmap *pm; 398 399 /* Update PID if we're returning to user mode. */ 400 if (srr1 & PSL_PR) { 401 pm = curproc->p_vmspace->vm_map.pmap; 402 if (!pm->pm_ctx) { 403 ctx_alloc((struct pmap *)pm); 404 } 405 ctx = pm->pm_ctx; 406 if (srr1 & PSL_SE) { 407 int dbreg, mask = 0x48000000; 408 /* 409 * Set the Internal Debug and 410 * Instruction Completion bits of 411 * the DBCR0 register. 412 * 413 * XXX this is also used by jtag debuggers... 414 */ 415 __asm __volatile("mfspr %0,0x3f2;" 416 "or %0,%0,%1;" 417 "mtspr 0x3f2,%0;" : 418 "=&r" (dbreg) : "r" (mask)); 419 } 420 } 421 else if (!ctx) { 422 ctx = KERNEL_PID; 423 } 424 return (ctx); 425 } 426 427 /* 428 * Used by copyin()/copyout() 429 */ 430 extern vaddr_t vmaprange __P((struct proc *, vaddr_t, vsize_t, int)); 431 extern void vunmaprange __P((vaddr_t, vsize_t)); 432 static int bigcopyin __P((const void *, void *, size_t )); 433 static int bigcopyout __P((const void *, void *, size_t )); 434 435 int 436 copyin(const void *udaddr, void *kaddr, size_t len) 437 { 438 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 439 int msr, pid, tmp, ctx; 440 struct faultbuf env; 441 442 /* For bigger buffers use the faster copy */ 443 if (len > 256) return (bigcopyin(udaddr, kaddr, len)); 444 445 if (setfault(&env)) { 446 curpcb->pcb_onfault = 0; 447 return EFAULT; 448 } 449 450 if (!(ctx = pm->pm_ctx)) { 451 /* No context -- assign it one */ 452 ctx_alloc(pm); 453 ctx = pm->pm_ctx; 454 } 455 456 asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 457 "mfmsr %0;" /* Save MSR */ 458 "li %1,0x20; " 459 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 460 "mfpid %1;" /* Save old PID */ 461 "sync; isync;" 462 463 "1: bdz 2f;" /* while len */ 464 "mtpid %3; sync;" /* Load user ctx */ 465 "lbz %2,0(%4); addi %4,%4,1;" /* Load byte */ 466 "sync; isync;" 467 "mtpid %1;sync;" 468 "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Store kernel byte */ 469 "sync; isync;" 470 "b 1b;" /* repeat */ 471 472 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 473 "sync; isync;" 474 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 475 : "r" (ctx), "r" (udaddr), "r" (kaddr), "r" (len)); 476 477 curpcb->pcb_onfault = 0; 478 return 0; 479 } 480 481 static int 482 bigcopyin(const void *udaddr, void *kaddr, size_t len) 483 { 484 const char *up; 485 char *kp = kaddr; 486 struct lwp *l = curlwp; 487 struct proc *p; 488 int error; 489 490 if (!l) { 491 return EFAULT; 492 } 493 494 p = l->l_proc; 495 496 /* 497 * Stolen from physio(): 498 */ 499 PHOLD(l); 500 error = uvm_vslock(p, (caddr_t)udaddr, len, VM_PROT_READ); 501 if (error) { 502 PRELE(l); 503 return EFAULT; 504 } 505 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 506 507 memcpy(kp, up, len); 508 vunmaprange((vaddr_t)up, len); 509 uvm_vsunlock(p, (caddr_t)udaddr, len); 510 PRELE(l); 511 512 return 0; 513 } 514 515 int 516 copyout(const void *kaddr, void *udaddr, size_t len) 517 { 518 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 519 int msr, pid, tmp, ctx; 520 struct faultbuf env; 521 522 /* For big copies use more efficient routine */ 523 if (len > 256) 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), "r" (udaddr), "r" (kaddr), "r" (len)); 556 557 curpcb->pcb_onfault = 0; 558 return 0; 559 } 560 561 static int 562 bigcopyout(const void *kaddr, void *udaddr, size_t len) 563 { 564 char *up; 565 const char *kp = (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 */ 606 int 607 kcopy(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 } 622 623 int 624 badaddr(void *addr, size_t size) 625 { 626 627 return badaddr_read(addr, size, NULL); 628 } 629 630 int 631 badaddr_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 */ 679 680 static int 681 fix_unaligned(struct lwp *l, struct trapframe *frame) 682 { 683 684 return -1; 685 } 686 687 /* 688 * Start a new LWP 689 */ 690 void 691 startlwp(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 */ 712 void 713 upcallret(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
Indexes created Tue Sep 23 22:09:46 GMT 2025