trap.c revision 1.61
1 /* $NetBSD: trap.c,v 1.61 2011/06/18 06:41:41 matt 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 1.61 2011/06/18 06:41:41 matt Exp $"); 71 72 #include "opt_altivec.h" 73 #include "opt_ddb.h" 74 #include "opt_kgdb.h" 75 76 #include <sys/param.h> 77 #include <sys/proc.h> 78 #include <sys/reboot.h> 79 #include <sys/syscall.h> 80 #include <sys/systm.h> 81 #include <sys/sa.h> 82 #include <sys/savar.h> 83 #include <sys/userret.h> 84 #include <sys/kauth.h> 85 #include <sys/cpu.h> 86 87 #if defined(KGDB) 88 #include <sys/kgdb.h> 89 #endif 90 91 #include <uvm/uvm_extern.h> 92 93 #include <dev/cons.h> 94 95 #include <machine/fpu.h> 96 #include <machine/frame.h> 97 #include <machine/pcb.h> 98 #include <machine/psl.h> 99 #include <machine/trap.h> 100 101 #include <powerpc/db_machdep.h> 102 #include <powerpc/spr.h> 103 #include <powerpc/ibm4xx/spr.h> 104 105 #include <powerpc/ibm4xx/cpu.h> 106 #include <powerpc/ibm4xx/pmap.h> 107 #include <powerpc/ibm4xx/tlb.h> 108 109 #include <powerpc/fpu/fpu_extern.h> 110 111 /* These definitions should probably be somewhere else XXX */ 112 #define FIRSTARG 3 /* first argument is in reg 3 */ 113 #define NARGREG 8 /* 8 args are in registers */ 114 #define MOREARGS(sp) ((void *)((int)(sp) + 8)) /* more args go here */ 115 116 static int fix_unaligned(struct lwp *l, struct trapframe *frame); 117 118 void trap(struct trapframe *); /* Called from locore / trap_subr */ 119 /* Why are these not defined in a header? */ 120 int badaddr(void *, size_t); 121 int badaddr_read(void *, size_t, int *); 122 int ctx_setup(int, int); 123 124 #ifdef DEBUG 125 #define TDB_ALL 0x1 126 int trapdebug = /* TDB_ALL */ 0; 127 #define DBPRINTF(x, y) if (trapdebug & (x)) printf y 128 #else 129 #define DBPRINTF(x, y) 130 #endif 131 132 void 133 trap(struct trapframe *tf) 134 { 135 struct lwp *l = curlwp; 136 struct proc *p = l->l_proc; 137 struct pcb *pcb; 138 int type = tf->tf_exc; 139 int ftype, rv; 140 ksiginfo_t ksi; 141 142 KASSERT(l->l_stat == LSONPROC); 143 144 if (tf->tf_srr1 & PSL_PR) { 145 LWP_CACHE_CREDS(l, p); 146 type |= EXC_USER; 147 } 148 149 ftype = VM_PROT_READ; 150 151 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 152 type, tf->tf_srr0, tf, &tf)); 153 154 switch (type) { 155 case EXC_DEBUG|EXC_USER: 156 { 157 int srr2, srr3; 158 159 __asm volatile("mfspr %0,0x3f0" : 160 "=r" (rv), "=r" (srr2), "=r" (srr3) :); 161 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, 162 srr3); 163 /* XXX fall through or break here?! */ 164 } 165 /* 166 * DEBUG intr -- probably single-step. 167 */ 168 case EXC_TRC|EXC_USER: 169 tf->tf_srr1 &= ~PSL_SE; 170 KSI_INIT_TRAP(&ksi); 171 ksi.ksi_signo = SIGTRAP; 172 ksi.ksi_trap = EXC_TRC; 173 ksi.ksi_addr = (void *)tf->tf_srr0; 174 trapsignal(l, &ksi); 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 va = tf->tf_dear; 190 if (tf->tf_pid == KERNEL_PID) { 191 map = kernel_map; 192 } else { 193 map = &p->p_vmspace->vm_map; 194 if ((l->l_flag & LW_SA) 195 && (~l->l_pflag & LP_SA_NOBLOCK)) { 196 l->l_savp->savp_faultaddr = va; 197 l->l_pflag |= LP_SA_PAGEFAULT; 198 } 199 } 200 201 if (tf->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 tf->tf_srr0, 207 (ftype & VM_PROT_WRITE) ? "write" : "read", 208 (void *)va, tf->tf_esr)); 209 210 pcb = lwp_getpcb(l); 211 fb = pcb->pcb_onfault; 212 pcb->pcb_onfault = NULL; 213 rv = uvm_fault(map, trunc_page(va), ftype); 214 pcb->pcb_onfault = fb; 215 if (map != kernel_map) { 216 l->l_pflag &= ~LP_SA_PAGEFAULT; 217 } 218 if (rv == 0) 219 goto done; 220 if (fb != NULL) { 221 tf->tf_pid = KERNEL_PID; 222 tf->tf_srr0 = fb->fb_pc; 223 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 224 tf->tf_cr = fb->fb_cr; 225 tf->tf_fixreg[1] = fb->fb_sp; 226 tf->tf_fixreg[2] = fb->fb_r2; 227 tf->tf_fixreg[3] = 1; /* Return TRUE */ 228 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 229 sizeof(fb->fb_fixreg)); 230 goto done; 231 } 232 } 233 goto brain_damage; 234 235 case EXC_DSI|EXC_USER: 236 /* FALLTHROUGH */ 237 case EXC_DTMISS|EXC_USER: 238 if (tf->tf_esr & (ESR_DST|ESR_DIZ)) 239 ftype = VM_PROT_WRITE; 240 241 DBPRINTF(TDB_ALL, 242 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 243 tf->tf_srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 244 tf->tf_dear, tf->tf_esr)); 245 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 246 if (l->l_flag & LW_SA) { 247 l->l_savp->savp_faultaddr = (vaddr_t)tf->tf_dear; 248 l->l_pflag |= LP_SA_PAGEFAULT; 249 } 250 // KASSERT(curpcb->pcb_onfault == NULL); 251 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(tf->tf_dear), 252 ftype); 253 if (rv == 0) { 254 l->l_pflag &= ~LP_SA_PAGEFAULT; 255 break; 256 } 257 KSI_INIT_TRAP(&ksi); 258 ksi.ksi_signo = SIGSEGV; 259 ksi.ksi_trap = EXC_DSI; 260 ksi.ksi_addr = (void *)tf->tf_dear; 261 if (rv == ENOMEM) { 262 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 263 "out of swap\n", 264 p->p_pid, p->p_comm, l->l_lid, 265 l->l_cred ? 266 kauth_cred_geteuid(l->l_cred) : -1); 267 ksi.ksi_signo = SIGKILL; 268 } 269 trapsignal(l, &ksi); 270 l->l_pflag &= ~LP_SA_PAGEFAULT; 271 break; 272 273 case EXC_ITMISS|EXC_USER: 274 case EXC_ISI|EXC_USER: 275 if (l->l_flag & LW_SA) { 276 l->l_savp->savp_faultaddr = (vaddr_t)tf->tf_srr0; 277 l->l_pflag |= LP_SA_PAGEFAULT; 278 } 279 ftype = VM_PROT_EXECUTE; 280 DBPRINTF(TDB_ALL, 281 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 282 tf->tf_srr0, tf)); 283 // KASSERT(curpcb->pcb_onfault == NULL); 284 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(tf->tf_srr0), 285 ftype); 286 if (rv == 0) { 287 l->l_pflag &= ~LP_SA_PAGEFAULT; 288 break; 289 } 290 KSI_INIT_TRAP(&ksi); 291 ksi.ksi_signo = SIGSEGV; 292 ksi.ksi_trap = EXC_ISI; 293 ksi.ksi_addr = (void *)tf->tf_srr0; 294 ksi.ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 295 trapsignal(l, &ksi); 296 l->l_pflag &= ~LP_SA_PAGEFAULT; 297 break; 298 299 case EXC_AST|EXC_USER: 300 l->l_md.md_astpending = 0; /* we are about to do it */ 301 //curcpu()->ci_data.cpu_nast++; 302 if (l->l_pflag & LP_OWEUPC) { 303 l->l_pflag &= ~LP_OWEUPC; 304 ADDUPROF(l); 305 } 306 /* Check whether we are being preempted. */ 307 if (curcpu()->ci_want_resched) 308 preempt(); 309 break; 310 311 312 case EXC_ALI|EXC_USER: 313 if (fix_unaligned(l, tf) != 0) { 314 KSI_INIT_TRAP(&ksi); 315 ksi.ksi_signo = SIGBUS; 316 ksi.ksi_trap = EXC_ALI; 317 ksi.ksi_addr = (void *)tf->tf_dear; 318 trapsignal(l, &ksi); 319 } else 320 tf->tf_srr0 += 4; 321 break; 322 323 case EXC_PGM|EXC_USER: 324 /* 325 * Illegal insn: 326 * 327 * let's try to see if it's FPU and can be emulated. 328 */ 329 curcpu()->ci_data.cpu_ntrap++; 330 pcb = lwp_getpcb(l); 331 332 if (!(l->l_md.md_flags & MDLWP_USEDFPU)) { 333 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 334 l->l_md.md_flags |= MDLWP_USEDFPU; 335 } 336 337 if ((rv = fpu_emulate(tf, (struct fpreg *)&pcb->pcb_fpu))) { 338 KSI_INIT_TRAP(&ksi); 339 ksi.ksi_signo = rv; 340 ksi.ksi_trap = EXC_PGM; 341 ksi.ksi_addr = (void *)tf->tf_srr0; 342 trapsignal(l, &ksi); 343 } 344 break; 345 346 case EXC_MCHK: 347 { 348 struct faultbuf *fb; 349 350 pcb = lwp_getpcb(l); 351 if ((fb = pcb->pcb_onfault) != NULL) { 352 tf->tf_pid = KERNEL_PID; 353 tf->tf_srr0 = fb->fb_pc; 354 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 355 tf->tf_fixreg[1] = fb->fb_sp; 356 tf->tf_fixreg[2] = fb->fb_r2; 357 tf->tf_fixreg[3] = 1; /* Return TRUE */ 358 tf->tf_cr = fb->fb_cr; 359 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 360 sizeof(fb->fb_fixreg)); 361 goto done; 362 } 363 } 364 goto brain_damage; 365 default: 366 brain_damage: 367 printf("trap type 0x%x at 0x%lx\n", type, tf->tf_srr0); 368 #if defined(DDB) || defined(KGDB) 369 if (kdb_trap(type, tf)) 370 goto done; 371 #endif 372 #ifdef TRAP_PANICWAIT 373 printf("Press a key to panic.\n"); 374 cngetc(); 375 #endif 376 panic("trap"); 377 } 378 379 /* Invoke MI userret code */ 380 mi_userret(l); 381 done: 382 return; 383 } 384 385 int 386 ctx_setup(int ctx, int srr1) 387 { 388 volatile struct pmap *pm; 389 390 /* Update PID if we're returning to user mode. */ 391 if (srr1 & PSL_PR) { 392 pm = curproc->p_vmspace->vm_map.pmap; 393 if (!pm->pm_ctx) { 394 ctx_alloc(__UNVOLATILE(pm)); 395 } 396 ctx = pm->pm_ctx; 397 if (srr1 & PSL_SE) { 398 int dbreg, mask = 0x48000000; 399 /* 400 * Set the Internal Debug and 401 * Instruction Completion bits of 402 * the DBCR0 register. 403 * 404 * XXX this is also used by jtag debuggers... 405 */ 406 __asm volatile("mfspr %0,0x3f2;" 407 "or %0,%0,%1;" 408 "mtspr 0x3f2,%0;" : 409 "=&r" (dbreg) : "r" (mask)); 410 } 411 } 412 else if (!ctx) { 413 ctx = KERNEL_PID; 414 } 415 return (ctx); 416 } 417 418 /* 419 * Used by copyin()/copyout() 420 */ 421 extern vaddr_t vmaprange(struct proc *, vaddr_t, vsize_t, int); 422 extern void vunmaprange(vaddr_t, vsize_t); 423 static int bigcopyin(const void *, void *, size_t ); 424 static int bigcopyout(const void *, void *, size_t ); 425 426 int 427 copyin(const void *udaddr, void *kaddr, size_t len) 428 { 429 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 430 int rv, msr, pid, tmp, ctx, count = 0; 431 struct faultbuf env; 432 433 /* For bigger buffers use the faster copy */ 434 if (len > 1024) 435 return (bigcopyin(udaddr, kaddr, len)); 436 437 if ((rv = setfault(&env))) { 438 curpcb->pcb_onfault = NULL; 439 return rv; 440 } 441 442 if (!(ctx = pm->pm_ctx)) { 443 /* No context -- assign it one */ 444 ctx_alloc(pm); 445 ctx = pm->pm_ctx; 446 } 447 448 __asm volatile( 449 " mfmsr %[msr];" /* Save MSR */ 450 " li %[pid],0x20; " 451 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 452 " mfpid %[pid];" /* Save old PID */ 453 " sync; isync;" 454 455 " srwi. %[count],%[len],0x2;" /* How many words? */ 456 " beq- 2f;" /* No words. Go do bytes */ 457 " mtctr %[count];" 458 "1: mtpid %[ctx]; sync;" 459 " lswi %[tmp],%[udaddr],4;" /* Load user word */ 460 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 461 " sync; isync;" 462 " mtpid %[pid];sync;" 463 " stswi %[tmp],%[kaddr],4;" /* Store kernel word */ 464 " dcbf 0,%[kaddr];" /* flush cache */ 465 " addi %[kaddr],%[kaddr],0x4;" /* next udaddr word */ 466 " sync; isync;" 467 " bdnz 1b;" /* repeat */ 468 469 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 470 " addi %[count],%[count],0x1;" 471 " mtctr %[count];" 472 "3: bdz 10f;" /* while count */ 473 " mtpid %[ctx];sync;" 474 " lbz %[tmp],0(%[udaddr]);" /* Load user byte */ 475 " addi %[udaddr],%[udaddr],0x1;" /* next udaddr byte */ 476 " sync; isync;" 477 " mtpid %[pid]; sync;" 478 " stb %[tmp],0(%[kaddr]);" /* Store kernel byte */ 479 " dcbf 0,%[kaddr];" /* flush cache */ 480 " addi %[kaddr],%[kaddr],0x1;" 481 " sync; isync;" 482 " b 3b;" 483 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" /* Restore PID and MSR */ 484 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 485 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), [len] "b" (len), [count] "b" (count)); 486 487 curpcb->pcb_onfault = NULL; 488 return 0; 489 } 490 491 static int 492 bigcopyin(const void *udaddr, void *kaddr, size_t len) 493 { 494 const char *up; 495 char *kp = kaddr; 496 struct lwp *l = curlwp; 497 struct proc *p; 498 struct faultbuf env; 499 int error; 500 501 p = l->l_proc; 502 503 /* 504 * Stolen from physio(): 505 */ 506 error = uvm_vslock(p->p_vmspace, __UNCONST(udaddr), len, VM_PROT_READ); 507 if (error) { 508 return error; 509 } 510 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 511 512 if ((error = setfault(&env)) == 0) { 513 memcpy(kp, up, len); 514 } 515 516 curpcb->pcb_onfault = NULL; 517 vunmaprange((vaddr_t)up, len); 518 uvm_vsunlock(p->p_vmspace, __UNCONST(udaddr), len); 519 520 return error; 521 } 522 523 int 524 copyout(const void *kaddr, void *udaddr, size_t len) 525 { 526 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 527 int rv, msr, pid, tmp, ctx, count = 0; 528 struct faultbuf env; 529 530 /* For big copies use more efficient routine */ 531 if (len > 1024) 532 return (bigcopyout(kaddr, udaddr, len)); 533 534 if ((rv = setfault(&env))) { 535 curpcb->pcb_onfault = NULL; 536 return rv; 537 } 538 539 if (!(ctx = pm->pm_ctx)) { 540 /* No context -- assign it one */ 541 ctx_alloc(pm); 542 ctx = pm->pm_ctx; 543 } 544 545 __asm volatile( 546 " mfmsr %[msr];" /* Save MSR */ \ 547 " li %[pid],0x20; " \ 548 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ \ 549 " mfpid %[pid];" /* Save old PID */ \ 550 " sync; isync;" 551 552 " srwi. %[count],%[len],0x2;" /* How many words? */ 553 " beq- 2f;" /* No words. Go do bytes */ 554 " mtctr %[count];" 555 "1: mtpid %[pid];sync;" 556 " lswi %[tmp],%[kaddr],4;" /* Load kernel word */ 557 " addi %[kaddr],%[kaddr],0x4;" /* next kaddr word */ 558 " sync; isync;" 559 " mtpid %[ctx]; sync;" 560 " stswi %[tmp],%[udaddr],4;" /* Store user word */ 561 " dcbf 0,%[udaddr];" /* flush cache */ 562 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 563 " sync; isync;" 564 " bdnz 1b;" /* repeat */ 565 566 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 567 " addi %[count],%[count],0x1;" 568 " mtctr %[count];" 569 "3: bdz 10f;" /* while count */ 570 " mtpid %[pid];sync;" 571 " lbz %[tmp],0(%[kaddr]);" /* Load kernel byte */ 572 " addi %[kaddr],%[kaddr],0x1;" /* next kaddr byte */ 573 " sync; isync;" 574 " mtpid %[ctx]; sync;" 575 " stb %[tmp],0(%[udaddr]);" /* Store user byte */ 576 " dcbf 0,%[udaddr];" /* flush cache */ 577 " addi %[udaddr],%[udaddr],0x1;" 578 " sync; isync;" 579 " b 3b;" 580 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" /* Restore PID and MSR */ 581 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 582 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), [len] "b" (len), [count] "b" (count)); 583 584 curpcb->pcb_onfault = NULL; 585 return 0; 586 } 587 588 static int 589 bigcopyout(const void *kaddr, void *udaddr, size_t len) 590 { 591 char *up; 592 const char *kp = (const char *)kaddr; 593 struct lwp *l = curlwp; 594 struct proc *p; 595 struct faultbuf env; 596 int error; 597 598 p = l->l_proc; 599 600 /* 601 * Stolen from physio(): 602 */ 603 error = uvm_vslock(p->p_vmspace, udaddr, len, VM_PROT_WRITE); 604 if (error) { 605 return error; 606 } 607 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 608 VM_PROT_READ | VM_PROT_WRITE); 609 610 if ((error = setfault(&env)) == 0) { 611 memcpy(up, kp, len); 612 } 613 614 curpcb->pcb_onfault = NULL; 615 vunmaprange((vaddr_t)up, len); 616 uvm_vsunlock(p->p_vmspace, udaddr, len); 617 618 return error; 619 } 620 621 /* 622 * kcopy(const void *src, void *dst, size_t len); 623 * 624 * Copy len bytes from src to dst, aborting if we encounter a fatal 625 * page fault. 626 * 627 * kcopy() _must_ save and restore the old fault handler since it is 628 * called by uiomove(), which may be in the path of servicing a non-fatal 629 * page fault. 630 */ 631 int 632 kcopy(const void *src, void *dst, size_t len) 633 { 634 struct faultbuf env, *oldfault; 635 int rv; 636 637 oldfault = curpcb->pcb_onfault; 638 if ((rv = setfault(&env))) { 639 curpcb->pcb_onfault = oldfault; 640 return rv; 641 } 642 643 memcpy(dst, src, len); 644 645 curpcb->pcb_onfault = oldfault; 646 return 0; 647 } 648 649 int 650 badaddr(void *addr, size_t size) 651 { 652 653 return badaddr_read(addr, size, NULL); 654 } 655 656 int 657 badaddr_read(void *addr, size_t size, int *rptr) 658 { 659 struct faultbuf env; 660 int x; 661 662 /* Get rid of any stale machine checks that have been waiting. */ 663 __asm volatile ("sync; isync"); 664 665 if (setfault(&env)) { 666 curpcb->pcb_onfault = NULL; 667 __asm volatile ("sync"); 668 return 1; 669 } 670 671 __asm volatile ("sync"); 672 673 switch (size) { 674 case 1: 675 x = *(volatile int8_t *)addr; 676 break; 677 case 2: 678 x = *(volatile int16_t *)addr; 679 break; 680 case 4: 681 x = *(volatile int32_t *)addr; 682 break; 683 default: 684 panic("badaddr: invalid size (%d)", size); 685 } 686 687 /* Make sure we took the machine check, if we caused one. */ 688 __asm volatile ("sync; isync"); 689 690 curpcb->pcb_onfault = NULL; 691 __asm volatile ("sync"); /* To be sure. */ 692 693 /* Use the value to avoid reorder. */ 694 if (rptr) 695 *rptr = x; 696 697 return 0; 698 } 699 700 /* 701 * For now, this only deals with the particular unaligned access case 702 * that gcc tends to generate. Eventually it should handle all of the 703 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 704 */ 705 706 static int 707 fix_unaligned(struct lwp *l, struct trapframe *tf) 708 { 709 710 return -1; 711 } 712
Indexes created Fri Sep 26 20:09:58 GMT 2025