trap.c revision 1.84
1 /* $NetBSD: trap.c,v 1.84 2020/07/15 08:48:40 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 #define __UFETCHSTORE_PRIVATE 70 71 #include <sys/cdefs.h> 72 __KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.84 2020/07/15 08:48:40 rin Exp $"); 73 74 #ifdef _KERNEL_OPT 75 #include "opt_ddb.h" 76 #include "opt_kgdb.h" 77 #include "opt_ppcarch.h" 78 #endif 79 80 #include <sys/param.h> 81 #include <sys/cpu.h> 82 #include <sys/kauth.h> 83 #include <sys/proc.h> 84 #include <sys/reboot.h> 85 #include <sys/syscall.h> 86 #include <sys/systm.h> 87 88 #if defined(KGDB) 89 #include <sys/kgdb.h> 90 #endif 91 92 #include <uvm/uvm_extern.h> 93 94 #include <dev/cons.h> 95 96 #include <machine/fpu.h> 97 #include <machine/frame.h> 98 #include <machine/pcb.h> 99 #include <machine/psl.h> 100 #include <machine/trap.h> 101 102 #include <powerpc/db_machdep.h> 103 #include <powerpc/spr.h> 104 #include <powerpc/userret.h> 105 106 #include <powerpc/ibm4xx/cpu.h> 107 #include <powerpc/ibm4xx/pmap.h> 108 #include <powerpc/ibm4xx/spr.h> 109 #include <powerpc/ibm4xx/tlb.h> 110 111 #include <powerpc/fpu/fpu_extern.h> 112 113 /* These definitions should probably be somewhere else XXX */ 114 #define FIRSTARG 3 /* first argument is in reg 3 */ 115 #define NARGREG 8 /* 8 args are in registers */ 116 #define MOREARGS(sp) ((void *)((int)(sp) + 8)) /* more args go here */ 117 118 static int fix_unaligned(struct lwp *l, struct trapframe *tf); 119 120 void trap(struct trapframe *); /* Called from locore / trap_subr */ 121 #if 0 122 /* Not currently used nor exposed externally in any header file */ 123 int badaddr(void *, size_t); 124 int badaddr_read(void *, size_t, int *); 125 #endif 126 int ctx_setup(int, int); 127 128 #ifdef DEBUG 129 #define TDB_ALL 0x1 130 int trapdebug = /* TDB_ALL */ 0; 131 #define DBPRINTF(x, y) if (trapdebug & (x)) printf y 132 #else 133 #define DBPRINTF(x, y) 134 #endif 135 136 void 137 trap(struct trapframe *tf) 138 { 139 struct lwp *l = curlwp; 140 struct proc *p = l->l_proc; 141 struct pcb *pcb; 142 int type = tf->tf_exc; 143 int ftype, rv; 144 ksiginfo_t ksi; 145 146 KASSERT(l->l_stat == LSONPROC); 147 148 if (tf->tf_srr1 & PSL_PR) { 149 LWP_CACHE_CREDS(l, p); 150 type |= EXC_USER; 151 } 152 153 ftype = VM_PROT_READ; 154 155 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 156 type, tf->tf_srr0, tf, &tf)); 157 158 switch (type) { 159 case EXC_DEBUG|EXC_USER: 160 { 161 int srr2, srr3; 162 163 __asm volatile("mfspr %0,0x3f0" : 164 "=r" (rv), "=r" (srr2), "=r" (srr3) :); 165 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, 166 srr3); 167 /* XXX fall through or break here?! */ 168 } 169 /* 170 * DEBUG intr -- probably single-step. 171 */ 172 case EXC_TRC|EXC_USER: 173 tf->tf_srr1 &= ~PSL_SE; 174 KSI_INIT_TRAP(&ksi); 175 ksi.ksi_signo = SIGTRAP; 176 ksi.ksi_trap = EXC_TRC; 177 ksi.ksi_addr = (void *)tf->tf_srr0; 178 trapsignal(l, &ksi); 179 break; 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; 188 189 pcb = lwp_getpcb(l); 190 fb = pcb->pcb_onfault; 191 192 if (curcpu()->ci_idepth >= 0) { 193 rv = EFAULT; 194 goto out; 195 } 196 197 va = tf->tf_dear; 198 if (tf->tf_pid == KERNEL_PID) { 199 map = kernel_map; 200 } else { 201 map = &p->p_vmspace->vm_map; 202 } 203 204 if (tf->tf_esr & (ESR_DST|ESR_DIZ)) 205 ftype = VM_PROT_WRITE; 206 207 DBPRINTF(TDB_ALL, 208 ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 209 tf->tf_srr0, 210 (ftype & VM_PROT_WRITE) ? "write" : "read", 211 (void *)va, tf->tf_esr)); 212 213 pcb->pcb_onfault = NULL; 214 rv = uvm_fault(map, trunc_page(va), ftype); 215 pcb->pcb_onfault = fb; 216 if (rv == 0) 217 return; 218 out: 219 if (fb != NULL) { 220 tf->tf_pid = KERNEL_PID; 221 tf->tf_srr0 = fb->fb_pc; 222 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 223 tf->tf_cr = fb->fb_cr; 224 tf->tf_fixreg[1] = fb->fb_sp; 225 tf->tf_fixreg[2] = fb->fb_r2; 226 tf->tf_fixreg[3] = rv; 227 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 228 sizeof(fb->fb_fixreg)); 229 return; 230 } 231 } 232 goto brain_damage; 233 234 case EXC_DSI|EXC_USER: 235 /* FALLTHROUGH */ 236 case EXC_DTMISS|EXC_USER: 237 if (tf->tf_esr & (ESR_DST|ESR_DIZ)) 238 ftype = VM_PROT_WRITE; 239 240 DBPRINTF(TDB_ALL, 241 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 242 tf->tf_srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 243 tf->tf_dear, tf->tf_esr)); 244 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 245 // KASSERT(curpcb->pcb_onfault == NULL); 246 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(tf->tf_dear), 247 ftype); 248 if (rv == 0) { 249 break; 250 } 251 KSI_INIT_TRAP(&ksi); 252 ksi.ksi_trap = EXC_DSI; 253 ksi.ksi_addr = (void *)tf->tf_dear; 254 vm_signal: 255 switch (rv) { 256 case EINVAL: 257 ksi.ksi_signo = SIGBUS; 258 ksi.ksi_code = BUS_ADRERR; 259 break; 260 case EACCES: 261 ksi.ksi_signo = SIGSEGV; 262 ksi.ksi_code = SEGV_ACCERR; 263 break; 264 case ENOMEM: 265 ksi.ksi_signo = SIGKILL; 266 printf("UVM: pid %d.%d (%s), uid %d killed: " 267 "out of swap\n", p->p_pid, l->l_lid, p->p_comm, 268 l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1); 269 break; 270 default: 271 ksi.ksi_signo = SIGSEGV; 272 ksi.ksi_code = SEGV_MAPERR; 273 break; 274 } 275 trapsignal(l, &ksi); 276 break; 277 278 case EXC_ITMISS|EXC_USER: 279 case EXC_ISI|EXC_USER: 280 ftype = VM_PROT_EXECUTE; 281 DBPRINTF(TDB_ALL, 282 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 283 tf->tf_srr0, tf)); 284 // KASSERT(curpcb->pcb_onfault == NULL); 285 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(tf->tf_srr0), 286 ftype); 287 if (rv == 0) { 288 break; 289 } 290 KSI_INIT_TRAP(&ksi); 291 ksi.ksi_trap = EXC_ISI; 292 ksi.ksi_addr = (void *)tf->tf_srr0; 293 goto vm_signal; 294 break; 295 296 case EXC_AST|EXC_USER: 297 cpu_ast(l, curcpu()); 298 break; 299 300 case EXC_ALI|EXC_USER: 301 if (fix_unaligned(l, tf) != 0) { 302 KSI_INIT_TRAP(&ksi); 303 ksi.ksi_signo = SIGBUS; 304 ksi.ksi_trap = EXC_ALI; 305 ksi.ksi_addr = (void *)tf->tf_dear; 306 trapsignal(l, &ksi); 307 } else 308 tf->tf_srr0 += 4; 309 break; 310 311 case EXC_PGM|EXC_USER: 312 curcpu()->ci_data.cpu_ntrap++; 313 314 KSI_INIT_TRAP(&ksi); 315 ksi.ksi_trap = EXC_PGM; 316 ksi.ksi_addr = (void *)tf->tf_srr0; 317 318 if (tf->tf_esr & ESR_PTR) { 319 sigtrap: 320 if (p->p_raslist != NULL && 321 ras_lookup(p, (void *)tf->tf_srr0) != (void *) -1) { 322 tf->tf_srr1 += 4; 323 break; 324 } 325 ksi.ksi_code = TRAP_BRKPT; 326 ksi.ksi_signo = SIGTRAP; 327 } else { 328 pcb = lwp_getpcb(l); 329 330 if (__predict_false(!fpu_used_p(l))) { 331 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 332 fpu_mark_used(l); 333 } 334 335 if (fpu_emulate(tf, &pcb->pcb_fpu, &ksi)) { 336 if (ksi.ksi_signo == 0) /* was emulated */ 337 break; 338 else if (ksi.ksi_signo == SIGTRAP) 339 goto sigtrap; /* XXX H/W bug? */ 340 } else { 341 ksi.ksi_code = ILL_ILLOPC; 342 ksi.ksi_signo = SIGILL; 343 } 344 } 345 346 trapsignal(l, &ksi); 347 break; 348 349 case EXC_MCHK: 350 { 351 struct faultbuf *fb; 352 353 pcb = lwp_getpcb(l); 354 if ((fb = pcb->pcb_onfault) != NULL) { 355 tf->tf_pid = KERNEL_PID; 356 tf->tf_srr0 = fb->fb_pc; 357 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 358 tf->tf_fixreg[1] = fb->fb_sp; 359 tf->tf_fixreg[2] = fb->fb_r2; 360 tf->tf_fixreg[3] = 1; /* Return TRUE */ 361 tf->tf_cr = fb->fb_cr; 362 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 363 sizeof(fb->fb_fixreg)); 364 return; 365 } 366 } 367 goto brain_damage; 368 369 default: 370 brain_damage: 371 printf("trap type 0x%x at 0x%lx\n", type, tf->tf_srr0); 372 #if defined(DDB) || defined(KGDB) 373 if (kdb_trap(type, tf)) 374 return; 375 #endif 376 #ifdef TRAP_PANICWAIT 377 printf("Press a key to panic.\n"); 378 cngetc(); 379 #endif 380 panic("trap"); 381 } 382 383 /* Invoke powerpc userret code */ 384 userret(l, tf); 385 } 386 387 int 388 ctx_setup(int ctx, int srr1) 389 { 390 volatile struct pmap *pm; 391 392 /* Update PID if we're returning to user mode. */ 393 if (srr1 & PSL_PR) { 394 pm = curproc->p_vmspace->vm_map.pmap; 395 if (!pm->pm_ctx) { 396 ctx_alloc(__UNVOLATILE(pm)); 397 } 398 ctx = pm->pm_ctx; 399 if (srr1 & PSL_SE) { 400 int dbreg, mask = 0x48000000; 401 /* 402 * Set the Internal Debug and 403 * Instruction Completion bits of 404 * the DBCR0 register. 405 * 406 * XXX this is also used by jtag debuggers... 407 */ 408 __asm volatile("mfspr %0,0x3f2;" 409 "or %0,%0,%1;" 410 "mtspr 0x3f2,%0;" : 411 "=&r" (dbreg) : "r" (mask)); 412 } 413 } 414 else if (!ctx) { 415 ctx = KERNEL_PID; 416 } 417 return (ctx); 418 } 419 420 /* 421 * Used by copyin()/copyout() 422 */ 423 extern vaddr_t vmaprange(struct proc *, vaddr_t, vsize_t, int); 424 extern void vunmaprange(vaddr_t, vsize_t); 425 static int bigcopyin(const void *, void *, size_t ); 426 static int bigcopyout(const void *, void *, size_t ); 427 428 int 429 copyin(const void *udaddr, void *kaddr, size_t len) 430 { 431 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 432 int rv, msr, pid, tmp, ctx, count = 0; 433 struct faultbuf env; 434 435 /* For bigger buffers use the faster copy */ 436 if (len > 1024) 437 return (bigcopyin(udaddr, kaddr, len)); 438 439 if ((rv = setfault(&env))) { 440 curpcb->pcb_onfault = NULL; 441 return rv; 442 } 443 444 if (!(ctx = pm->pm_ctx)) { 445 /* No context -- assign it one */ 446 ctx_alloc(pm); 447 ctx = pm->pm_ctx; 448 } 449 450 __asm volatile( 451 " mfmsr %[msr];" /* Save MSR */ 452 " li %[pid],0x20;" 453 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 454 " isync;" 455 " mfpid %[pid];" /* Save old PID */ 456 457 " srwi. %[count],%[len],0x2;" /* How many words? */ 458 " beq- 2f;" /* No words. Go do bytes */ 459 " mtctr %[count];" 460 "1: mtpid %[ctx]; isync;" 461 #ifdef PPC_IBM403 462 " lswi %[tmp],%[udaddr],4;" /* Load user word */ 463 #else 464 " lwz %[tmp],0(%[udaddr]);" 465 #endif 466 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 467 " sync;" 468 " mtpid %[pid]; isync;" 469 #ifdef PPC_IBM403 470 " stswi %[tmp],%[kaddr],4;" /* Store kernel word */ 471 #else 472 " stw %[tmp],0(%[kaddr]);" 473 #endif 474 " dcbst 0,%[kaddr];" /* flush cache */ 475 " addi %[kaddr],%[kaddr],0x4;" /* next udaddr word */ 476 " sync;" 477 " bdnz 1b;" /* repeat */ 478 479 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 480 " addi %[count],%[count],0x1;" 481 " mtctr %[count];" 482 "3: bdz 10f;" /* while count */ 483 " mtpid %[ctx]; isync;" 484 " lbz %[tmp],0(%[udaddr]);" /* Load user byte */ 485 " addi %[udaddr],%[udaddr],0x1;" /* next udaddr byte */ 486 " sync;" 487 " mtpid %[pid]; isync;" 488 " stb %[tmp],0(%[kaddr]);" /* Store kernel byte */ 489 " dcbst 0,%[kaddr];" /* flush cache */ 490 " addi %[kaddr],%[kaddr],0x1;" 491 " sync;" 492 " b 3b;" 493 "10:mtpid %[pid]; mtmsr %[msr]; isync;" 494 /* Restore PID and MSR */ 495 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 496 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), 497 [len] "b" (len), [count] "b" (count)); 498 499 curpcb->pcb_onfault = NULL; 500 return 0; 501 } 502 503 static int 504 bigcopyin(const void *udaddr, void *kaddr, size_t len) 505 { 506 const char *up; 507 char *kp = kaddr; 508 struct lwp *l = curlwp; 509 struct proc *p; 510 struct faultbuf env; 511 int error; 512 513 p = l->l_proc; 514 515 /* 516 * Stolen from physio(): 517 */ 518 error = uvm_vslock(p->p_vmspace, __UNCONST(udaddr), len, VM_PROT_READ); 519 if (error) { 520 return error; 521 } 522 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 523 524 if ((error = setfault(&env)) == 0) { 525 memcpy(kp, up, len); 526 } 527 528 curpcb->pcb_onfault = NULL; 529 vunmaprange((vaddr_t)up, len); 530 uvm_vsunlock(p->p_vmspace, __UNCONST(udaddr), len); 531 532 return error; 533 } 534 535 int 536 copyout(const void *kaddr, void *udaddr, size_t len) 537 { 538 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 539 int rv, msr, pid, tmp, ctx, count = 0; 540 struct faultbuf env; 541 542 /* For big copies use more efficient routine */ 543 if (len > 1024) 544 return (bigcopyout(kaddr, udaddr, len)); 545 546 if ((rv = setfault(&env))) { 547 curpcb->pcb_onfault = NULL; 548 return rv; 549 } 550 551 if (!(ctx = pm->pm_ctx)) { 552 /* No context -- assign it one */ 553 ctx_alloc(pm); 554 ctx = pm->pm_ctx; 555 } 556 557 __asm volatile( 558 " mfmsr %[msr];" /* Save MSR */ 559 " li %[pid],0x20;" 560 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 561 " isync;" 562 " mfpid %[pid];" /* Save old PID */ 563 564 " srwi. %[count],%[len],0x2;" /* How many words? */ 565 " beq- 2f;" /* No words. Go do bytes */ 566 " mtctr %[count];" 567 "1: mtpid %[pid]; isync;" 568 #ifdef PPC_IBM403 569 " lswi %[tmp],%[kaddr],4;" /* Load kernel word */ 570 #else 571 " lwz %[tmp],0(%[kaddr]);" 572 #endif 573 " addi %[kaddr],%[kaddr],0x4;" /* next kaddr word */ 574 " sync;" 575 " mtpid %[ctx]; isync;" 576 #ifdef PPC_IBM403 577 " stswi %[tmp],%[udaddr],4;" /* Store user word */ 578 #else 579 " stw %[tmp],0(%[udaddr]);" 580 #endif 581 " dcbst 0,%[udaddr];" /* flush cache */ 582 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 583 " sync;" 584 " bdnz 1b;" /* repeat */ 585 586 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 587 " addi %[count],%[count],0x1;" 588 " mtctr %[count];" 589 "3: bdz 10f;" /* while count */ 590 " mtpid %[pid]; isync;" 591 " lbz %[tmp],0(%[kaddr]);" /* Load kernel byte */ 592 " addi %[kaddr],%[kaddr],0x1;" /* next kaddr byte */ 593 " sync;" 594 " mtpid %[ctx]; isync;" 595 " stb %[tmp],0(%[udaddr]);" /* Store user byte */ 596 " dcbst 0,%[udaddr];" /* flush cache */ 597 " addi %[udaddr],%[udaddr],0x1;" 598 " sync;" 599 " b 3b;" 600 "10:mtpid %[pid]; mtmsr %[msr]; isync;" 601 /* Restore PID and MSR */ 602 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 603 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), 604 [len] "b" (len), [count] "b" (count)); 605 606 curpcb->pcb_onfault = NULL; 607 return 0; 608 } 609 610 static int 611 bigcopyout(const void *kaddr, void *udaddr, size_t len) 612 { 613 char *up; 614 const char *kp = (const char *)kaddr; 615 struct lwp *l = curlwp; 616 struct proc *p; 617 struct faultbuf env; 618 int error; 619 620 p = l->l_proc; 621 622 /* 623 * Stolen from physio(): 624 */ 625 error = uvm_vslock(p->p_vmspace, udaddr, len, VM_PROT_WRITE); 626 if (error) { 627 return error; 628 } 629 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 630 VM_PROT_READ | VM_PROT_WRITE); 631 632 if ((error = setfault(&env)) == 0) { 633 memcpy(up, kp, len); 634 } 635 636 curpcb->pcb_onfault = NULL; 637 vunmaprange((vaddr_t)up, len); 638 uvm_vsunlock(p->p_vmspace, udaddr, len); 639 640 return error; 641 } 642 643 /* 644 * kcopy(const void *src, void *dst, size_t len); 645 * 646 * Copy len bytes from src to dst, aborting if we encounter a fatal 647 * page fault. 648 * 649 * kcopy() _must_ save and restore the old fault handler since it is 650 * called by uiomove(), which may be in the path of servicing a non-fatal 651 * page fault. 652 */ 653 int 654 kcopy(const void *src, void *dst, size_t len) 655 { 656 struct faultbuf env, *oldfault; 657 int rv; 658 659 oldfault = curpcb->pcb_onfault; 660 if ((rv = setfault(&env))) { 661 curpcb->pcb_onfault = oldfault; 662 return rv; 663 } 664 665 memcpy(dst, src, len); 666 667 curpcb->pcb_onfault = oldfault; 668 return 0; 669 } 670 671 #if 0 672 int 673 badaddr(void *addr, size_t size) 674 { 675 676 return badaddr_read(addr, size, NULL); 677 } 678 679 int 680 badaddr_read(void *addr, size_t size, int *rptr) 681 { 682 struct faultbuf env; 683 int x; 684 685 /* Get rid of any stale machine checks that have been waiting. */ 686 __asm volatile ("sync; isync"); 687 688 if (setfault(&env)) { 689 curpcb->pcb_onfault = NULL; 690 __asm volatile ("sync"); 691 return 1; 692 } 693 694 __asm volatile ("sync"); 695 696 switch (size) { 697 case 1: 698 x = *(volatile int8_t *)addr; 699 break; 700 case 2: 701 x = *(volatile int16_t *)addr; 702 break; 703 case 4: 704 x = *(volatile int32_t *)addr; 705 break; 706 default: 707 panic("badaddr: invalid size (%d)", size); 708 } 709 710 /* Make sure we took the machine check, if we caused one. */ 711 __asm volatile ("sync; isync"); 712 713 curpcb->pcb_onfault = NULL; 714 __asm volatile ("sync"); /* To be sure. */ 715 716 /* Use the value to avoid reorder. */ 717 if (rptr) 718 *rptr = x; 719 720 return 0; 721 } 722 #endif 723 724 /* 725 * For now, this only deals with the particular unaligned access case 726 * that gcc tends to generate. Eventually it should handle all of the 727 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 728 */ 729 730 static int 731 fix_unaligned(struct lwp *l, struct trapframe *tf) 732 { 733 734 return -1; 735 } 736 737 /* 738 * XXX Extremely lame implementations of _ufetch_* / _ustore_*. IBM 4xx 739 * experts should make versions that are good. 740 */ 741 742 #define UFETCH(sz) \ 743 int \ 744 _ufetch_ ## sz(const uint ## sz ## _t *uaddr, uint ## sz ## _t *valp) \ 745 { \ 746 return copyin(uaddr, valp, sizeof(*valp)); \ 747 } 748 749 UFETCH(8) 750 UFETCH(16) 751 UFETCH(32) 752 753 #define USTORE(sz) \ 754 int \ 755 _ustore_ ## sz(uint ## sz ## _t *uaddr, uint ## sz ## _t val) \ 756 { \ 757 return copyout(&val, uaddr, sizeof(val)); \ 758 } 759 760 USTORE(8) 761 USTORE(16) 762 USTORE(32) 763
Indexes created Mon Sep 22 13:09:51 GMT 2025