trap.c revision 1.62.6.1
1 /* $NetBSD: trap.c,v 1.62.6.1 2012/02/18 07:32:53 mrg 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 1.62.6.1 2012/02/18 07:32:53 mrg 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 *tf); 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 cpu_ast(l, curcpu()); 301 break; 302 303 case EXC_ALI|EXC_USER: 304 if (fix_unaligned(l, tf) != 0) { 305 KSI_INIT_TRAP(&ksi); 306 ksi.ksi_signo = SIGBUS; 307 ksi.ksi_trap = EXC_ALI; 308 ksi.ksi_addr = (void *)tf->tf_dear; 309 trapsignal(l, &ksi); 310 } else 311 tf->tf_srr0 += 4; 312 break; 313 314 case EXC_PGM|EXC_USER: 315 /* 316 * Illegal insn: 317 * 318 * let's try to see if it's FPU and can be emulated. 319 */ 320 curcpu()->ci_data.cpu_ntrap++; 321 pcb = lwp_getpcb(l); 322 323 if (!(l->l_md.md_flags & MDLWP_USEDFPU)) { 324 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 325 l->l_md.md_flags |= MDLWP_USEDFPU; 326 } 327 328 if ((rv = fpu_emulate(tf, (struct fpreg *)&pcb->pcb_fpu))) { 329 KSI_INIT_TRAP(&ksi); 330 ksi.ksi_signo = rv; 331 ksi.ksi_trap = EXC_PGM; 332 ksi.ksi_addr = (void *)tf->tf_srr0; 333 trapsignal(l, &ksi); 334 } 335 break; 336 337 case EXC_MCHK: 338 { 339 struct faultbuf *fb; 340 341 pcb = lwp_getpcb(l); 342 if ((fb = pcb->pcb_onfault) != NULL) { 343 tf->tf_pid = KERNEL_PID; 344 tf->tf_srr0 = fb->fb_pc; 345 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 346 tf->tf_fixreg[1] = fb->fb_sp; 347 tf->tf_fixreg[2] = fb->fb_r2; 348 tf->tf_fixreg[3] = 1; /* Return TRUE */ 349 tf->tf_cr = fb->fb_cr; 350 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 351 sizeof(fb->fb_fixreg)); 352 goto done; 353 } 354 } 355 goto brain_damage; 356 default: 357 brain_damage: 358 printf("trap type 0x%x at 0x%lx\n", type, tf->tf_srr0); 359 #if defined(DDB) || defined(KGDB) 360 if (kdb_trap(type, tf)) 361 goto done; 362 #endif 363 #ifdef TRAP_PANICWAIT 364 printf("Press a key to panic.\n"); 365 cngetc(); 366 #endif 367 panic("trap"); 368 } 369 370 /* Invoke MI userret code */ 371 mi_userret(l); 372 done: 373 return; 374 } 375 376 int 377 ctx_setup(int ctx, int srr1) 378 { 379 volatile struct pmap *pm; 380 381 /* Update PID if we're returning to user mode. */ 382 if (srr1 & PSL_PR) { 383 pm = curproc->p_vmspace->vm_map.pmap; 384 if (!pm->pm_ctx) { 385 ctx_alloc(__UNVOLATILE(pm)); 386 } 387 ctx = pm->pm_ctx; 388 if (srr1 & PSL_SE) { 389 int dbreg, mask = 0x48000000; 390 /* 391 * Set the Internal Debug and 392 * Instruction Completion bits of 393 * the DBCR0 register. 394 * 395 * XXX this is also used by jtag debuggers... 396 */ 397 __asm volatile("mfspr %0,0x3f2;" 398 "or %0,%0,%1;" 399 "mtspr 0x3f2,%0;" : 400 "=&r" (dbreg) : "r" (mask)); 401 } 402 } 403 else if (!ctx) { 404 ctx = KERNEL_PID; 405 } 406 return (ctx); 407 } 408 409 /* 410 * Used by copyin()/copyout() 411 */ 412 extern vaddr_t vmaprange(struct proc *, vaddr_t, vsize_t, int); 413 extern void vunmaprange(vaddr_t, vsize_t); 414 static int bigcopyin(const void *, void *, size_t ); 415 static int bigcopyout(const void *, void *, size_t ); 416 417 int 418 copyin(const void *udaddr, void *kaddr, size_t len) 419 { 420 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 421 int rv, msr, pid, tmp, ctx, count = 0; 422 struct faultbuf env; 423 424 /* For bigger buffers use the faster copy */ 425 if (len > 1024) 426 return (bigcopyin(udaddr, kaddr, len)); 427 428 if ((rv = setfault(&env))) { 429 curpcb->pcb_onfault = NULL; 430 return rv; 431 } 432 433 if (!(ctx = pm->pm_ctx)) { 434 /* No context -- assign it one */ 435 ctx_alloc(pm); 436 ctx = pm->pm_ctx; 437 } 438 439 __asm volatile( 440 " mfmsr %[msr];" /* Save MSR */ 441 " li %[pid],0x20; " 442 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 443 " mfpid %[pid];" /* Save old PID */ 444 " sync; isync;" 445 446 " srwi. %[count],%[len],0x2;" /* How many words? */ 447 " beq- 2f;" /* No words. Go do bytes */ 448 " mtctr %[count];" 449 "1: mtpid %[ctx]; sync;" 450 " lswi %[tmp],%[udaddr],4;" /* Load user word */ 451 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 452 " sync; isync;" 453 " mtpid %[pid];sync;" 454 " stswi %[tmp],%[kaddr],4;" /* Store kernel word */ 455 " dcbf 0,%[kaddr];" /* flush cache */ 456 " addi %[kaddr],%[kaddr],0x4;" /* next udaddr word */ 457 " sync; isync;" 458 " bdnz 1b;" /* repeat */ 459 460 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 461 " addi %[count],%[count],0x1;" 462 " mtctr %[count];" 463 "3: bdz 10f;" /* while count */ 464 " mtpid %[ctx];sync;" 465 " lbz %[tmp],0(%[udaddr]);" /* Load user byte */ 466 " addi %[udaddr],%[udaddr],0x1;" /* next udaddr byte */ 467 " sync; isync;" 468 " mtpid %[pid]; sync;" 469 " stb %[tmp],0(%[kaddr]);" /* Store kernel byte */ 470 " dcbf 0,%[kaddr];" /* flush cache */ 471 " addi %[kaddr],%[kaddr],0x1;" 472 " sync; isync;" 473 " b 3b;" 474 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" /* Restore PID and MSR */ 475 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 476 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), [len] "b" (len), [count] "b" (count)); 477 478 curpcb->pcb_onfault = NULL; 479 return 0; 480 } 481 482 static int 483 bigcopyin(const void *udaddr, void *kaddr, size_t len) 484 { 485 const char *up; 486 char *kp = kaddr; 487 struct lwp *l = curlwp; 488 struct proc *p; 489 struct faultbuf env; 490 int error; 491 492 p = l->l_proc; 493 494 /* 495 * Stolen from physio(): 496 */ 497 error = uvm_vslock(p->p_vmspace, __UNCONST(udaddr), len, VM_PROT_READ); 498 if (error) { 499 return error; 500 } 501 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 502 503 if ((error = setfault(&env)) == 0) { 504 memcpy(kp, up, len); 505 } 506 507 curpcb->pcb_onfault = NULL; 508 vunmaprange((vaddr_t)up, len); 509 uvm_vsunlock(p->p_vmspace, __UNCONST(udaddr), len); 510 511 return error; 512 } 513 514 int 515 copyout(const void *kaddr, void *udaddr, size_t len) 516 { 517 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 518 int rv, msr, pid, tmp, ctx, count = 0; 519 struct faultbuf env; 520 521 /* For big copies use more efficient routine */ 522 if (len > 1024) 523 return (bigcopyout(kaddr, udaddr, len)); 524 525 if ((rv = setfault(&env))) { 526 curpcb->pcb_onfault = NULL; 527 return rv; 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( 537 " mfmsr %[msr];" /* Save MSR */ \ 538 " li %[pid],0x20; " \ 539 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ \ 540 " mfpid %[pid];" /* Save old PID */ \ 541 " sync; isync;" 542 543 " srwi. %[count],%[len],0x2;" /* How many words? */ 544 " beq- 2f;" /* No words. Go do bytes */ 545 " mtctr %[count];" 546 "1: mtpid %[pid];sync;" 547 " lswi %[tmp],%[kaddr],4;" /* Load kernel word */ 548 " addi %[kaddr],%[kaddr],0x4;" /* next kaddr word */ 549 " sync; isync;" 550 " mtpid %[ctx]; sync;" 551 " stswi %[tmp],%[udaddr],4;" /* Store user word */ 552 " dcbf 0,%[udaddr];" /* flush cache */ 553 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 554 " sync; isync;" 555 " bdnz 1b;" /* repeat */ 556 557 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 558 " addi %[count],%[count],0x1;" 559 " mtctr %[count];" 560 "3: bdz 10f;" /* while count */ 561 " mtpid %[pid];sync;" 562 " lbz %[tmp],0(%[kaddr]);" /* Load kernel byte */ 563 " addi %[kaddr],%[kaddr],0x1;" /* next kaddr byte */ 564 " sync; isync;" 565 " mtpid %[ctx]; sync;" 566 " stb %[tmp],0(%[udaddr]);" /* Store user byte */ 567 " dcbf 0,%[udaddr];" /* flush cache */ 568 " addi %[udaddr],%[udaddr],0x1;" 569 " sync; isync;" 570 " b 3b;" 571 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" /* Restore PID and MSR */ 572 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 573 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), [len] "b" (len), [count] "b" (count)); 574 575 curpcb->pcb_onfault = NULL; 576 return 0; 577 } 578 579 static int 580 bigcopyout(const void *kaddr, void *udaddr, size_t len) 581 { 582 char *up; 583 const char *kp = (const char *)kaddr; 584 struct lwp *l = curlwp; 585 struct proc *p; 586 struct faultbuf env; 587 int error; 588 589 p = l->l_proc; 590 591 /* 592 * Stolen from physio(): 593 */ 594 error = uvm_vslock(p->p_vmspace, udaddr, len, VM_PROT_WRITE); 595 if (error) { 596 return error; 597 } 598 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 599 VM_PROT_READ | VM_PROT_WRITE); 600 601 if ((error = setfault(&env)) == 0) { 602 memcpy(up, kp, len); 603 } 604 605 curpcb->pcb_onfault = NULL; 606 vunmaprange((vaddr_t)up, len); 607 uvm_vsunlock(p->p_vmspace, udaddr, len); 608 609 return error; 610 } 611 612 /* 613 * kcopy(const void *src, void *dst, size_t len); 614 * 615 * Copy len bytes from src to dst, aborting if we encounter a fatal 616 * page fault. 617 * 618 * kcopy() _must_ save and restore the old fault handler since it is 619 * called by uiomove(), which may be in the path of servicing a non-fatal 620 * page fault. 621 */ 622 int 623 kcopy(const void *src, void *dst, size_t len) 624 { 625 struct faultbuf env, *oldfault; 626 int rv; 627 628 oldfault = curpcb->pcb_onfault; 629 if ((rv = setfault(&env))) { 630 curpcb->pcb_onfault = oldfault; 631 return rv; 632 } 633 634 memcpy(dst, src, len); 635 636 curpcb->pcb_onfault = oldfault; 637 return 0; 638 } 639 640 int 641 badaddr(void *addr, size_t size) 642 { 643 644 return badaddr_read(addr, size, NULL); 645 } 646 647 int 648 badaddr_read(void *addr, size_t size, int *rptr) 649 { 650 struct faultbuf env; 651 int x; 652 653 /* Get rid of any stale machine checks that have been waiting. */ 654 __asm volatile ("sync; isync"); 655 656 if (setfault(&env)) { 657 curpcb->pcb_onfault = NULL; 658 __asm volatile ("sync"); 659 return 1; 660 } 661 662 __asm volatile ("sync"); 663 664 switch (size) { 665 case 1: 666 x = *(volatile int8_t *)addr; 667 break; 668 case 2: 669 x = *(volatile int16_t *)addr; 670 break; 671 case 4: 672 x = *(volatile int32_t *)addr; 673 break; 674 default: 675 panic("badaddr: invalid size (%d)", size); 676 } 677 678 /* Make sure we took the machine check, if we caused one. */ 679 __asm volatile ("sync; isync"); 680 681 curpcb->pcb_onfault = NULL; 682 __asm volatile ("sync"); /* To be sure. */ 683 684 /* Use the value to avoid reorder. */ 685 if (rptr) 686 *rptr = x; 687 688 return 0; 689 } 690 691 /* 692 * For now, this only deals with the particular unaligned access case 693 * that gcc tends to generate. Eventually it should handle all of the 694 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 695 */ 696 697 static int 698 fix_unaligned(struct lwp *l, struct trapframe *tf) 699 { 700 701 return -1; 702 } 703
Indexes created Tue Sep 30 20:09:53 GMT 2025