trap.c revision 1.82
1 /* $NetBSD: trap.c,v 1.82 2020/07/06 09:34:16 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 1.82 2020/07/06 09:34:16 rin Exp $"); 73 74 #ifdef _KERNEL_OPT 75 #include "opt_altivec.h" 76 #include "opt_ddb.h" 77 #include "opt_kgdb.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 /* 313 * Illegal insn: 314 * 315 * let's try to see if its FPU and can be emulated. 316 */ 317 curcpu()->ci_data.cpu_ntrap++; 318 pcb = lwp_getpcb(l); 319 320 if (__predict_false(!fpu_used_p(l))) { 321 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 322 fpu_mark_used(l); 323 } 324 325 if (fpu_emulate(tf, &pcb->pcb_fpu, &ksi)) { 326 if (ksi.ksi_signo == 0) /* was emulated */ 327 break; 328 } else { 329 ksi.ksi_signo = SIGILL; 330 ksi.ksi_code = ILL_ILLOPC; 331 ksi.ksi_trap = EXC_PGM; 332 ksi.ksi_addr = (void *)tf->tf_srr0; 333 } 334 335 trapsignal(l, &ksi); 336 break; 337 338 case EXC_MCHK: 339 { 340 struct faultbuf *fb; 341 342 pcb = lwp_getpcb(l); 343 if ((fb = pcb->pcb_onfault) != NULL) { 344 tf->tf_pid = KERNEL_PID; 345 tf->tf_srr0 = fb->fb_pc; 346 tf->tf_srr1 |= PSL_IR; /* Re-enable IMMU */ 347 tf->tf_fixreg[1] = fb->fb_sp; 348 tf->tf_fixreg[2] = fb->fb_r2; 349 tf->tf_fixreg[3] = 1; /* Return TRUE */ 350 tf->tf_cr = fb->fb_cr; 351 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, 352 sizeof(fb->fb_fixreg)); 353 return; 354 } 355 } 356 goto brain_damage; 357 358 default: 359 brain_damage: 360 printf("trap type 0x%x at 0x%lx\n", type, tf->tf_srr0); 361 #if defined(DDB) || defined(KGDB) 362 if (kdb_trap(type, tf)) 363 return; 364 #endif 365 #ifdef TRAP_PANICWAIT 366 printf("Press a key to panic.\n"); 367 cngetc(); 368 #endif 369 panic("trap"); 370 } 371 372 /* Invoke powerpc userret code */ 373 userret(l, tf); 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 " isync;" 444 " mfpid %[pid];" /* Save old PID */ 445 446 " srwi. %[count],%[len],0x2;" /* How many words? */ 447 " beq- 2f;" /* No words. Go do bytes */ 448 " mtctr %[count];" 449 "1: mtpid %[ctx]; isync;" 450 #ifdef PPC_IBM403 451 " lswi %[tmp],%[udaddr],4;" /* Load user word */ 452 #else 453 " lwz %[tmp],0(%[udaddr]);" 454 #endif 455 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 456 " sync;" 457 " mtpid %[pid]; isync;" 458 #ifdef PPC_IBM403 459 " stswi %[tmp],%[kaddr],4;" /* Store kernel word */ 460 #else 461 " stw %[tmp],0(%[kaddr]);" 462 #endif 463 " dcbst 0,%[kaddr];" /* flush cache */ 464 " addi %[kaddr],%[kaddr],0x4;" /* next udaddr word */ 465 " sync;" 466 " bdnz 1b;" /* repeat */ 467 468 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 469 " addi %[count],%[count],0x1;" 470 " mtctr %[count];" 471 "3: bdz 10f;" /* while count */ 472 " mtpid %[ctx]; isync;" 473 " lbz %[tmp],0(%[udaddr]);" /* Load user byte */ 474 " addi %[udaddr],%[udaddr],0x1;" /* next udaddr byte */ 475 " sync;" 476 " mtpid %[pid]; isync;" 477 " stb %[tmp],0(%[kaddr]);" /* Store kernel byte */ 478 " dcbst 0,%[kaddr];" /* flush cache */ 479 " addi %[kaddr],%[kaddr],0x1;" 480 " sync;" 481 " b 3b;" 482 "10:mtpid %[pid]; mtmsr %[msr]; isync;" 483 /* Restore PID and MSR */ 484 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 485 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), 486 [len] "b" (len), [count] "b" (count)); 487 488 curpcb->pcb_onfault = NULL; 489 return 0; 490 } 491 492 static int 493 bigcopyin(const void *udaddr, void *kaddr, size_t len) 494 { 495 const char *up; 496 char *kp = kaddr; 497 struct lwp *l = curlwp; 498 struct proc *p; 499 struct faultbuf env; 500 int error; 501 502 p = l->l_proc; 503 504 /* 505 * Stolen from physio(): 506 */ 507 error = uvm_vslock(p->p_vmspace, __UNCONST(udaddr), len, VM_PROT_READ); 508 if (error) { 509 return error; 510 } 511 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 512 513 if ((error = setfault(&env)) == 0) { 514 memcpy(kp, up, len); 515 } 516 517 curpcb->pcb_onfault = NULL; 518 vunmaprange((vaddr_t)up, len); 519 uvm_vsunlock(p->p_vmspace, __UNCONST(udaddr), len); 520 521 return error; 522 } 523 524 int 525 copyout(const void *kaddr, void *udaddr, size_t len) 526 { 527 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 528 int rv, msr, pid, tmp, ctx, count = 0; 529 struct faultbuf env; 530 531 /* For big copies use more efficient routine */ 532 if (len > 1024) 533 return (bigcopyout(kaddr, udaddr, len)); 534 535 if ((rv = setfault(&env))) { 536 curpcb->pcb_onfault = NULL; 537 return rv; 538 } 539 540 if (!(ctx = pm->pm_ctx)) { 541 /* No context -- assign it one */ 542 ctx_alloc(pm); 543 ctx = pm->pm_ctx; 544 } 545 546 __asm volatile( 547 " mfmsr %[msr];" /* Save MSR */ 548 " li %[pid],0x20;" 549 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ 550 " isync;" 551 " mfpid %[pid];" /* Save old PID */ 552 553 " srwi. %[count],%[len],0x2;" /* How many words? */ 554 " beq- 2f;" /* No words. Go do bytes */ 555 " mtctr %[count];" 556 "1: mtpid %[pid]; isync;" 557 #ifdef PPC_IBM403 558 " lswi %[tmp],%[kaddr],4;" /* Load kernel word */ 559 #else 560 " lwz %[tmp],0(%[kaddr]);" 561 #endif 562 " addi %[kaddr],%[kaddr],0x4;" /* next kaddr word */ 563 " sync;" 564 " mtpid %[ctx]; isync;" 565 #ifdef PPC_IBM403 566 " stswi %[tmp],%[udaddr],4;" /* Store user word */ 567 #else 568 " stw %[tmp],0(%[udaddr]);" 569 #endif 570 " dcbst 0,%[udaddr];" /* flush cache */ 571 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 572 " sync;" 573 " bdnz 1b;" /* repeat */ 574 575 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 576 " addi %[count],%[count],0x1;" 577 " mtctr %[count];" 578 "3: bdz 10f;" /* while count */ 579 " mtpid %[pid]; isync;" 580 " lbz %[tmp],0(%[kaddr]);" /* Load kernel byte */ 581 " addi %[kaddr],%[kaddr],0x1;" /* next kaddr byte */ 582 " sync;" 583 " mtpid %[ctx]; isync;" 584 " stb %[tmp],0(%[udaddr]);" /* Store user byte */ 585 " dcbst 0,%[udaddr];" /* flush cache */ 586 " addi %[udaddr],%[udaddr],0x1;" 587 " sync;" 588 " b 3b;" 589 "10:mtpid %[pid]; mtmsr %[msr]; isync;" 590 /* Restore PID and MSR */ 591 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 592 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), 593 [len] "b" (len), [count] "b" (count)); 594 595 curpcb->pcb_onfault = NULL; 596 return 0; 597 } 598 599 static int 600 bigcopyout(const void *kaddr, void *udaddr, size_t len) 601 { 602 char *up; 603 const char *kp = (const char *)kaddr; 604 struct lwp *l = curlwp; 605 struct proc *p; 606 struct faultbuf env; 607 int error; 608 609 p = l->l_proc; 610 611 /* 612 * Stolen from physio(): 613 */ 614 error = uvm_vslock(p->p_vmspace, udaddr, len, VM_PROT_WRITE); 615 if (error) { 616 return error; 617 } 618 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 619 VM_PROT_READ | VM_PROT_WRITE); 620 621 if ((error = setfault(&env)) == 0) { 622 memcpy(up, kp, len); 623 } 624 625 curpcb->pcb_onfault = NULL; 626 vunmaprange((vaddr_t)up, len); 627 uvm_vsunlock(p->p_vmspace, udaddr, len); 628 629 return error; 630 } 631 632 /* 633 * kcopy(const void *src, void *dst, size_t len); 634 * 635 * Copy len bytes from src to dst, aborting if we encounter a fatal 636 * page fault. 637 * 638 * kcopy() _must_ save and restore the old fault handler since it is 639 * called by uiomove(), which may be in the path of servicing a non-fatal 640 * page fault. 641 */ 642 int 643 kcopy(const void *src, void *dst, size_t len) 644 { 645 struct faultbuf env, *oldfault; 646 int rv; 647 648 oldfault = curpcb->pcb_onfault; 649 if ((rv = setfault(&env))) { 650 curpcb->pcb_onfault = oldfault; 651 return rv; 652 } 653 654 memcpy(dst, src, len); 655 656 curpcb->pcb_onfault = oldfault; 657 return 0; 658 } 659 660 #if 0 661 int 662 badaddr(void *addr, size_t size) 663 { 664 665 return badaddr_read(addr, size, NULL); 666 } 667 668 int 669 badaddr_read(void *addr, size_t size, int *rptr) 670 { 671 struct faultbuf env; 672 int x; 673 674 /* Get rid of any stale machine checks that have been waiting. */ 675 __asm volatile ("sync; isync"); 676 677 if (setfault(&env)) { 678 curpcb->pcb_onfault = NULL; 679 __asm volatile ("sync"); 680 return 1; 681 } 682 683 __asm volatile ("sync"); 684 685 switch (size) { 686 case 1: 687 x = *(volatile int8_t *)addr; 688 break; 689 case 2: 690 x = *(volatile int16_t *)addr; 691 break; 692 case 4: 693 x = *(volatile int32_t *)addr; 694 break; 695 default: 696 panic("badaddr: invalid size (%d)", size); 697 } 698 699 /* Make sure we took the machine check, if we caused one. */ 700 __asm volatile ("sync; isync"); 701 702 curpcb->pcb_onfault = NULL; 703 __asm volatile ("sync"); /* To be sure. */ 704 705 /* Use the value to avoid reorder. */ 706 if (rptr) 707 *rptr = x; 708 709 return 0; 710 } 711 #endif 712 713 /* 714 * For now, this only deals with the particular unaligned access case 715 * that gcc tends to generate. Eventually it should handle all of the 716 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 717 */ 718 719 static int 720 fix_unaligned(struct lwp *l, struct trapframe *tf) 721 { 722 723 return -1; 724 } 725 726 /* 727 * XXX Extremely lame implementations of _ufetch_* / _ustore_*. IBM 4xx 728 * experts should make versions that are good. 729 */ 730 731 #define UFETCH(sz) \ 732 int \ 733 _ufetch_ ## sz(const uint ## sz ## _t *uaddr, uint ## sz ## _t *valp) \ 734 { \ 735 return copyin(uaddr, valp, sizeof(*valp)); \ 736 } 737 738 UFETCH(8) 739 UFETCH(16) 740 UFETCH(32) 741 742 #define USTORE(sz) \ 743 int \ 744 _ustore_ ## sz(uint ## sz ## _t *uaddr, uint ## sz ## _t val) \ 745 { \ 746 return copyout(&val, uaddr, sizeof(val)); \ 747 } 748 749 USTORE(8) 750 USTORE(16) 751 USTORE(32) 752
Indexes created Thu Sep 25 16:09:42 GMT 2025