trap.c revision 1.76
1 /* $NetBSD: trap.c,v 1.76 2020/02/21 14:27:20 rin 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 1.76 2020/02/21 14:27:20 rin Exp $"); 71 72 #include "opt_altivec.h" 73 #include "opt_ddb.h" 74 #include "opt_kgdb.h" 75 76 #define __UFETCHSTORE_PRIVATE 77 78 #include <sys/param.h> 79 #include <sys/cpu.h> 80 #include <sys/kauth.h> 81 #include <sys/proc.h> 82 #include <sys/reboot.h> 83 #include <sys/syscall.h> 84 #include <sys/systm.h> 85 86 #if defined(KGDB) 87 #include <sys/kgdb.h> 88 #endif 89 90 #include <uvm/uvm_extern.h> 91 92 #include <dev/cons.h> 93 94 #include <machine/fpu.h> 95 #include <machine/frame.h> 96 #include <machine/pcb.h> 97 #include <machine/psl.h> 98 #include <machine/trap.h> 99 100 #include <powerpc/db_machdep.h> 101 #include <powerpc/spr.h> 102 #include <powerpc/userret.h> 103 104 #include <powerpc/ibm4xx/cpu.h> 105 #include <powerpc/ibm4xx/pmap.h> 106 #include <powerpc/ibm4xx/spr.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 #if 0 120 /* Not currently used nor exposed externally in any header file */ 121 int badaddr(void *, size_t); 122 int badaddr_read(void *, size_t, int *); 123 #endif 124 int ctx_setup(int, int); 125 126 #ifdef DEBUG 127 #define TDB_ALL 0x1 128 int trapdebug = /* TDB_ALL */ 0; 129 #define DBPRINTF(x, y) if (trapdebug & (x)) printf y 130 #else 131 #define DBPRINTF(x, y) 132 #endif 133 134 void 135 trap(struct trapframe *tf) 136 { 137 struct lwp *l = curlwp; 138 struct proc *p = l->l_proc; 139 struct pcb *pcb; 140 int type = tf->tf_exc; 141 int ftype, rv; 142 ksiginfo_t ksi; 143 144 KASSERT(l->l_stat == LSONPROC); 145 146 if (tf->tf_srr1 & PSL_PR) { 147 LWP_CACHE_CREDS(l, p); 148 type |= EXC_USER; 149 } 150 151 ftype = VM_PROT_READ; 152 153 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 154 type, tf->tf_srr0, tf, &tf)); 155 156 switch (type) { 157 case EXC_DEBUG|EXC_USER: 158 { 159 int srr2, srr3; 160 161 __asm volatile("mfspr %0,0x3f0" : 162 "=r" (rv), "=r" (srr2), "=r" (srr3) :); 163 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, 164 srr3); 165 /* XXX fall through or break here?! */ 166 } 167 /* 168 * DEBUG intr -- probably single-step. 169 */ 170 case EXC_TRC|EXC_USER: 171 tf->tf_srr1 &= ~PSL_SE; 172 KSI_INIT_TRAP(&ksi); 173 ksi.ksi_signo = SIGTRAP; 174 ksi.ksi_trap = EXC_TRC; 175 ksi.ksi_addr = (void *)tf->tf_srr0; 176 trapsignal(l, &ksi); 177 break; 178 179 case EXC_DSI: 180 /* FALLTHROUGH */ 181 case EXC_DTMISS: 182 { 183 struct vm_map *map; 184 vaddr_t va; 185 struct faultbuf *fb = NULL; 186 187 va = tf->tf_dear; 188 if (tf->tf_pid == KERNEL_PID) { 189 map = kernel_map; 190 } else { 191 map = &p->p_vmspace->vm_map; 192 } 193 194 if (tf->tf_esr & (ESR_DST|ESR_DIZ)) 195 ftype = VM_PROT_WRITE; 196 197 DBPRINTF(TDB_ALL, 198 ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 199 tf->tf_srr0, 200 (ftype & VM_PROT_WRITE) ? "write" : "read", 201 (void *)va, tf->tf_esr)); 202 203 pcb = lwp_getpcb(l); 204 fb = pcb->pcb_onfault; 205 pcb->pcb_onfault = NULL; 206 rv = uvm_fault(map, trunc_page(va), ftype); 207 pcb->pcb_onfault = fb; 208 if (rv == 0) 209 return; 210 if (fb != NULL) { 211 tf->tf_pid = KERNEL_PID; 212 tf->tf_srr0 = fb->fb_pc; 213 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 214 tf->tf_cr = fb->fb_cr; 215 tf->tf_fixreg[1] = fb->fb_sp; 216 tf->tf_fixreg[2] = fb->fb_r2; 217 tf->tf_fixreg[3] = 1; /* Return TRUE */ 218 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 219 sizeof(fb->fb_fixreg)); 220 return; 221 } 222 } 223 goto brain_damage; 224 225 case EXC_DSI|EXC_USER: 226 /* FALLTHROUGH */ 227 case EXC_DTMISS|EXC_USER: 228 if (tf->tf_esr & (ESR_DST|ESR_DIZ)) 229 ftype = VM_PROT_WRITE; 230 231 DBPRINTF(TDB_ALL, 232 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 233 tf->tf_srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 234 tf->tf_dear, tf->tf_esr)); 235 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 236 // KASSERT(curpcb->pcb_onfault == NULL); 237 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(tf->tf_dear), 238 ftype); 239 if (rv == 0) { 240 break; 241 } 242 KSI_INIT_TRAP(&ksi); 243 ksi.ksi_signo = SIGSEGV; 244 ksi.ksi_trap = EXC_DSI; 245 ksi.ksi_addr = (void *)tf->tf_dear; 246 if (rv == ENOMEM) { 247 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 248 "out of swap\n", 249 p->p_pid, p->p_comm, l->l_lid, 250 l->l_cred ? 251 kauth_cred_geteuid(l->l_cred) : -1); 252 ksi.ksi_signo = SIGKILL; 253 } 254 trapsignal(l, &ksi); 255 break; 256 257 case EXC_ITMISS|EXC_USER: 258 case EXC_ISI|EXC_USER: 259 ftype = VM_PROT_EXECUTE; 260 DBPRINTF(TDB_ALL, 261 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 262 tf->tf_srr0, tf)); 263 // KASSERT(curpcb->pcb_onfault == NULL); 264 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(tf->tf_srr0), 265 ftype); 266 if (rv == 0) { 267 break; 268 } 269 KSI_INIT_TRAP(&ksi); 270 ksi.ksi_signo = SIGSEGV; 271 ksi.ksi_trap = EXC_ISI; 272 ksi.ksi_addr = (void *)tf->tf_srr0; 273 ksi.ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 274 trapsignal(l, &ksi); 275 break; 276 277 case EXC_AST|EXC_USER: 278 cpu_ast(l, curcpu()); 279 break; 280 281 case EXC_ALI|EXC_USER: 282 if (fix_unaligned(l, tf) != 0) { 283 KSI_INIT_TRAP(&ksi); 284 ksi.ksi_signo = SIGBUS; 285 ksi.ksi_trap = EXC_ALI; 286 ksi.ksi_addr = (void *)tf->tf_dear; 287 trapsignal(l, &ksi); 288 } else 289 tf->tf_srr0 += 4; 290 break; 291 292 case EXC_PGM|EXC_USER: 293 /* 294 * Illegal insn: 295 * 296 * let's try to see if its FPU and can be emulated. 297 */ 298 curcpu()->ci_data.cpu_ntrap++; 299 pcb = lwp_getpcb(l); 300 301 if (__predict_false(!fpu_used_p(l))) { 302 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 303 fpu_mark_used(l); 304 } 305 306 if (fpu_emulate(tf, &pcb->pcb_fpu, &ksi)) { 307 if (ksi.ksi_signo == 0) /* was emulated */ 308 break; 309 } else { 310 ksi.ksi_signo = SIGILL; 311 ksi.ksi_code = ILL_ILLOPC; 312 ksi.ksi_trap = EXC_PGM; 313 ksi.ksi_addr = (void *)tf->tf_srr0; 314 } 315 316 trapsignal(l, &ksi); 317 break; 318 319 case EXC_MCHK: 320 { 321 struct faultbuf *fb; 322 323 pcb = lwp_getpcb(l); 324 if ((fb = pcb->pcb_onfault) != NULL) { 325 tf->tf_pid = KERNEL_PID; 326 tf->tf_srr0 = fb->fb_pc; 327 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 328 tf->tf_fixreg[1] = fb->fb_sp; 329 tf->tf_fixreg[2] = fb->fb_r2; 330 tf->tf_fixreg[3] = 1; /* Return TRUE */ 331 tf->tf_cr = fb->fb_cr; 332 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 333 sizeof(fb->fb_fixreg)); 334 return; 335 } 336 } 337 goto brain_damage; 338 339 default: 340 brain_damage: 341 printf("trap type 0x%x at 0x%lx\n", type, tf->tf_srr0); 342 #if defined(DDB) || defined(KGDB) 343 if (kdb_trap(type, tf)) 344 return; 345 #endif 346 #ifdef TRAP_PANICWAIT 347 printf("Press a key to panic.\n"); 348 cngetc(); 349 #endif 350 panic("trap"); 351 } 352 353 /* Invoke powerpc userret code */ 354 userret(l, tf); 355 } 356 357 int 358 ctx_setup(int ctx, int srr1) 359 { 360 volatile struct pmap *pm; 361 362 /* Update PID if we're returning to user mode. */ 363 if (srr1 & PSL_PR) { 364 pm = curproc->p_vmspace->vm_map.pmap; 365 if (!pm->pm_ctx) { 366 ctx_alloc(__UNVOLATILE(pm)); 367 } 368 ctx = pm->pm_ctx; 369 if (srr1 & PSL_SE) { 370 int dbreg, mask = 0x48000000; 371 /* 372 * Set the Internal Debug and 373 * Instruction Completion bits of 374 * the DBCR0 register. 375 * 376 * XXX this is also used by jtag debuggers... 377 */ 378 __asm volatile("mfspr %0,0x3f2;" 379 "or %0,%0,%1;" 380 "mtspr 0x3f2,%0;" : 381 "=&r" (dbreg) : "r" (mask)); 382 } 383 } 384 else if (!ctx) { 385 ctx = KERNEL_PID; 386 } 387 return (ctx); 388 } 389 390 /* 391 * Used by copyin()/copyout() 392 */ 393 extern vaddr_t vmaprange(struct proc *, vaddr_t, vsize_t, int); 394 extern void vunmaprange(vaddr_t, vsize_t); 395 static int bigcopyin(const void *, void *, size_t ); 396 static int bigcopyout(const void *, void *, size_t ); 397 398 int 399 copyin(const void *udaddr, void *kaddr, size_t len) 400 { 401 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 402 int rv, msr, pid, tmp, ctx, count = 0; 403 struct faultbuf env; 404 405 /* For bigger buffers use the faster copy */ 406 if (len > 1024) 407 return (bigcopyin(udaddr, kaddr, len)); 408 409 if ((rv = setfault(&env))) { 410 curpcb->pcb_onfault = NULL; 411 return rv; 412 } 413 414 if (!(ctx = pm->pm_ctx)) { 415 /* No context -- assign it one */ 416 ctx_alloc(pm); 417 ctx = pm->pm_ctx; 418 } 419 420 __asm volatile( 421 " mfmsr %[msr];" /* Save MSR */ 422 " li %[pid],0x20;" 423 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 424 " mfpid %[pid];" /* Save old PID */ 425 " sync; isync;" 426 427 " srwi. %[count],%[len],0x2;" /* How many words? */ 428 " beq- 2f;" /* No words. Go do bytes */ 429 " mtctr %[count];" 430 "1: mtpid %[ctx]; sync;" 431 " lswi %[tmp],%[udaddr],4;" /* Load user word */ 432 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 433 " sync; isync;" 434 " mtpid %[pid]; sync;" 435 " stswi %[tmp],%[kaddr],4;" /* Store kernel word */ 436 " dcbf 0,%[kaddr];" /* flush cache */ 437 " addi %[kaddr],%[kaddr],0x4;" /* next udaddr word */ 438 " sync; isync;" 439 " bdnz 1b;" /* repeat */ 440 441 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 442 " addi %[count],%[count],0x1;" 443 " mtctr %[count];" 444 "3: bdz 10f;" /* while count */ 445 " mtpid %[ctx]; sync;" 446 " lbz %[tmp],0(%[udaddr]);" /* Load user byte */ 447 " addi %[udaddr],%[udaddr],0x1;" /* next udaddr byte */ 448 " sync; isync;" 449 " mtpid %[pid]; sync;" 450 " stb %[tmp],0(%[kaddr]);" /* Store kernel byte */ 451 " dcbf 0,%[kaddr];" /* flush cache */ 452 " addi %[kaddr],%[kaddr],0x1;" 453 " sync; isync;" 454 " b 3b;" 455 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" 456 /* Restore PID and MSR */ 457 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 458 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), 459 [len] "b" (len), [count] "b" (count)); 460 461 curpcb->pcb_onfault = NULL; 462 return 0; 463 } 464 465 static int 466 bigcopyin(const void *udaddr, void *kaddr, size_t len) 467 { 468 const char *up; 469 char *kp = kaddr; 470 struct lwp *l = curlwp; 471 struct proc *p; 472 struct faultbuf env; 473 int error; 474 475 p = l->l_proc; 476 477 /* 478 * Stolen from physio(): 479 */ 480 error = uvm_vslock(p->p_vmspace, __UNCONST(udaddr), len, VM_PROT_READ); 481 if (error) { 482 return error; 483 } 484 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 485 486 if ((error = setfault(&env)) == 0) { 487 memcpy(kp, up, len); 488 } 489 490 curpcb->pcb_onfault = NULL; 491 vunmaprange((vaddr_t)up, len); 492 uvm_vsunlock(p->p_vmspace, __UNCONST(udaddr), len); 493 494 return error; 495 } 496 497 int 498 copyout(const void *kaddr, void *udaddr, size_t len) 499 { 500 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 501 int rv, msr, pid, tmp, ctx, count = 0; 502 struct faultbuf env; 503 504 /* For big copies use more efficient routine */ 505 if (len > 1024) 506 return (bigcopyout(kaddr, udaddr, len)); 507 508 if ((rv = setfault(&env))) { 509 curpcb->pcb_onfault = NULL; 510 return rv; 511 } 512 513 if (!(ctx = pm->pm_ctx)) { 514 /* No context -- assign it one */ 515 ctx_alloc(pm); 516 ctx = pm->pm_ctx; 517 } 518 519 __asm volatile( 520 " mfmsr %[msr];" /* Save MSR */ 521 " li %[pid],0x20;" 522 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 523 " mfpid %[pid];" /* Save old PID */ 524 " sync; isync;" 525 526 " srwi. %[count],%[len],0x2;" /* How many words? */ 527 " beq- 2f;" /* No words. Go do bytes */ 528 " mtctr %[count];" 529 "1: mtpid %[pid]; sync;" 530 " lswi %[tmp],%[kaddr],4;" /* Load kernel word */ 531 " addi %[kaddr],%[kaddr],0x4;" /* next kaddr word */ 532 " sync; isync;" 533 " mtpid %[ctx]; sync;" 534 " stswi %[tmp],%[udaddr],4;" /* Store user word */ 535 " dcbf 0,%[udaddr];" /* flush cache */ 536 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 537 " sync; isync;" 538 " bdnz 1b;" /* repeat */ 539 540 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 541 " addi %[count],%[count],0x1;" 542 " mtctr %[count];" 543 "3: bdz 10f;" /* while count */ 544 " mtpid %[pid]; sync;" 545 " lbz %[tmp],0(%[kaddr]);" /* Load kernel byte */ 546 " addi %[kaddr],%[kaddr],0x1;" /* next kaddr byte */ 547 " sync; isync;" 548 " mtpid %[ctx]; sync;" 549 " stb %[tmp],0(%[udaddr]);" /* Store user byte */ 550 " dcbf 0,%[udaddr];" /* flush cache */ 551 " addi %[udaddr],%[udaddr],0x1;" 552 " sync; isync;" 553 " b 3b;" 554 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" 555 /* Restore PID and MSR */ 556 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 557 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), 558 [len] "b" (len), [count] "b" (count)); 559 560 curpcb->pcb_onfault = NULL; 561 return 0; 562 } 563 564 static int 565 bigcopyout(const void *kaddr, void *udaddr, size_t len) 566 { 567 char *up; 568 const char *kp = (const char *)kaddr; 569 struct lwp *l = curlwp; 570 struct proc *p; 571 struct faultbuf env; 572 int error; 573 574 p = l->l_proc; 575 576 /* 577 * Stolen from physio(): 578 */ 579 error = uvm_vslock(p->p_vmspace, udaddr, len, VM_PROT_WRITE); 580 if (error) { 581 return error; 582 } 583 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 584 VM_PROT_READ | VM_PROT_WRITE); 585 586 if ((error = setfault(&env)) == 0) { 587 memcpy(up, kp, len); 588 } 589 590 curpcb->pcb_onfault = NULL; 591 vunmaprange((vaddr_t)up, len); 592 uvm_vsunlock(p->p_vmspace, udaddr, len); 593 594 return error; 595 } 596 597 /* 598 * kcopy(const void *src, void *dst, size_t len); 599 * 600 * Copy len bytes from src to dst, aborting if we encounter a fatal 601 * page fault. 602 * 603 * kcopy() _must_ save and restore the old fault handler since it is 604 * called by uiomove(), which may be in the path of servicing a non-fatal 605 * page fault. 606 */ 607 int 608 kcopy(const void *src, void *dst, size_t len) 609 { 610 struct faultbuf env, *oldfault; 611 int rv; 612 613 oldfault = curpcb->pcb_onfault; 614 if ((rv = setfault(&env))) { 615 curpcb->pcb_onfault = oldfault; 616 return rv; 617 } 618 619 memcpy(dst, src, len); 620 621 curpcb->pcb_onfault = oldfault; 622 return 0; 623 } 624 625 #if 0 626 int 627 badaddr(void *addr, size_t size) 628 { 629 630 return badaddr_read(addr, size, NULL); 631 } 632 633 int 634 badaddr_read(void *addr, size_t size, int *rptr) 635 { 636 struct faultbuf env; 637 int x; 638 639 /* Get rid of any stale machine checks that have been waiting. */ 640 __asm volatile ("sync; isync"); 641 642 if (setfault(&env)) { 643 curpcb->pcb_onfault = NULL; 644 __asm volatile ("sync"); 645 return 1; 646 } 647 648 __asm volatile ("sync"); 649 650 switch (size) { 651 case 1: 652 x = *(volatile int8_t *)addr; 653 break; 654 case 2: 655 x = *(volatile int16_t *)addr; 656 break; 657 case 4: 658 x = *(volatile int32_t *)addr; 659 break; 660 default: 661 panic("badaddr: invalid size (%d)", size); 662 } 663 664 /* Make sure we took the machine check, if we caused one. */ 665 __asm volatile ("sync; isync"); 666 667 curpcb->pcb_onfault = NULL; 668 __asm volatile ("sync"); /* To be sure. */ 669 670 /* Use the value to avoid reorder. */ 671 if (rptr) 672 *rptr = x; 673 674 return 0; 675 } 676 #endif 677 678 /* 679 * For now, this only deals with the particular unaligned access case 680 * that gcc tends to generate. Eventually it should handle all of the 681 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 682 */ 683 684 static int 685 fix_unaligned(struct lwp *l, struct trapframe *tf) 686 { 687 688 return -1; 689 } 690 691 /* 692 * XXX Extremely lame implementations of _ufetch_* / _ustore_*. IBM 4xx 693 * experts should make versions that are good. 694 */ 695 696 #define UFETCH(sz) \ 697 int \ 698 _ufetch_ ## sz(const uint ## sz ## _t *uaddr, uint ## sz ## _t *valp) \ 699 { \ 700 return copyin(uaddr, valp, sizeof(*valp)); \ 701 } 702 703 UFETCH(8) 704 UFETCH(16) 705 UFETCH(32) 706 707 #define USTORE(sz) \ 708 int \ 709 _ustore_ ## sz(uint ## sz ## _t *uaddr, uint ## sz ## _t val) \ 710 { \ 711 return copyout(&val, uaddr, sizeof(val)); \ 712 } 713 714 USTORE(8) 715 USTORE(16) 716 USTORE(32) 717
Indexes created Wed Sep 24 05:09:52 GMT 2025