trap.c revision 1.53
1 /* $NetBSD: trap.c,v 1.53 2009/11/21 17:40:29 rmind 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 1.53 2009/11/21 17:40:29 rmind 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/pool.h> 82 #include <sys/sa.h> 83 #include <sys/savar.h> 84 #include <sys/userret.h> 85 #include <sys/kauth.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/cpu.h> 96 #include <machine/db_machdep.h> 97 #include <machine/fpu.h> 98 #include <machine/frame.h> 99 #include <machine/pcb.h> 100 #include <machine/psl.h> 101 #include <machine/trap.h> 102 103 #include <powerpc/spr.h> 104 #include <powerpc/ibm4xx/pmap.h> 105 #include <powerpc/ibm4xx/tlb.h> 106 #include <powerpc/fpu/fpu_extern.h> 107 108 /* These definitions should probably be somewhere else XXX */ 109 #define FIRSTARG 3 /* first argument is in reg 3 */ 110 #define NARGREG 8 /* 8 args are in registers */ 111 #define MOREARGS(sp) ((void *)((int)(sp) + 8)) /* more args go here */ 112 113 static int fix_unaligned(struct lwp *l, struct trapframe *frame); 114 115 void trap(struct trapframe *); /* Called from locore / trap_subr */ 116 /* Why are these not defined in a header? */ 117 int badaddr(void *, size_t); 118 int badaddr_read(void *, size_t, int *); 119 int ctx_setup(int, int); 120 121 #ifdef DEBUG 122 #define TDB_ALL 0x1 123 int trapdebug = /* TDB_ALL */ 0; 124 #define DBPRINTF(x, y) if (trapdebug & (x)) printf y 125 #else 126 #define DBPRINTF(x, y) 127 #endif 128 129 void 130 trap(struct trapframe *frame) 131 { 132 struct lwp *l = curlwp; 133 struct proc *p = l ? l->l_proc : NULL; 134 struct pcb *pcb; 135 int type = frame->exc; 136 int ftype, rv; 137 ksiginfo_t ksi; 138 139 KASSERT(l == NULL || (l->l_stat == LSONPROC)); 140 141 if (frame->srr1 & PSL_PR) { 142 LWP_CACHE_CREDS(l, p); 143 type |= EXC_USER; 144 } 145 146 ftype = VM_PROT_READ; 147 148 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 149 type, frame->srr0, frame, &frame)); 150 151 switch (type) { 152 case EXC_DEBUG|EXC_USER: 153 { 154 int srr2, srr3; 155 156 __asm volatile("mfspr %0,0x3f0" : 157 "=r" (rv), "=r" (srr2), "=r" (srr3) :); 158 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, 159 srr3); 160 /* XXX fall through or break here?! */ 161 } 162 /* 163 * DEBUG intr -- probably single-step. 164 */ 165 case EXC_TRC|EXC_USER: 166 frame->srr1 &= ~PSL_SE; 167 KSI_INIT_TRAP(&ksi); 168 ksi.ksi_signo = SIGTRAP; 169 ksi.ksi_trap = EXC_TRC; 170 ksi.ksi_addr = (void *)frame->srr0; 171 trapsignal(l, &ksi); 172 break; 173 174 /* 175 * If we could not find and install appropriate TLB entry, fall through. 176 */ 177 178 case EXC_DSI: 179 /* FALLTHROUGH */ 180 case EXC_DTMISS: 181 { 182 struct vm_map *map; 183 vaddr_t va; 184 struct faultbuf *fb = NULL; 185 186 va = frame->dar; 187 if (frame->tf_xtra[TF_PID] == KERNEL_PID) { 188 map = kernel_map; 189 } else { 190 map = &p->p_vmspace->vm_map; 191 if ((l->l_flag & LW_SA) 192 && (~l->l_pflag & LP_SA_NOBLOCK)) { 193 l->l_savp->savp_faultaddr = va; 194 l->l_pflag |= LP_SA_PAGEFAULT; 195 } 196 } 197 198 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 199 ftype = VM_PROT_WRITE; 200 201 DBPRINTF(TDB_ALL, 202 ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 203 frame->srr0, 204 (ftype & VM_PROT_WRITE) ? "write" : "read", 205 (void *)va, frame->tf_xtra[TF_ESR])); 206 rv = uvm_fault(map, trunc_page(va), ftype); 207 if (map != kernel_map) { 208 l->l_pflag &= ~LP_SA_PAGEFAULT; 209 } 210 if (rv == 0) 211 goto done; 212 pcb = lwp_getpcb(l); 213 if ((fb = pcb->pcb_onfault) != NULL) { 214 frame->tf_xtra[TF_PID] = KERNEL_PID; 215 frame->srr0 = fb->fb_pc; 216 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 217 frame->fixreg[1] = fb->fb_sp; 218 frame->fixreg[2] = fb->fb_r2; 219 frame->fixreg[3] = 1; /* Return TRUE */ 220 frame->cr = fb->fb_cr; 221 memcpy(&frame->fixreg[13], fb->fb_fixreg, 222 sizeof(fb->fb_fixreg)); 223 goto done; 224 } 225 } 226 goto brain_damage; 227 228 case EXC_DSI|EXC_USER: 229 /* FALLTHROUGH */ 230 case EXC_DTMISS|EXC_USER: 231 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 232 ftype = VM_PROT_WRITE; 233 234 DBPRINTF(TDB_ALL, 235 ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 236 frame->srr0, (ftype & VM_PROT_WRITE) ? "write" : "read", 237 frame->dar, frame->tf_xtra[TF_ESR])); 238 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 239 if (l->l_flag & LW_SA) { 240 l->l_savp->savp_faultaddr = (vaddr_t)frame->dar; 241 l->l_pflag |= LP_SA_PAGEFAULT; 242 } 243 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->dar), 244 ftype); 245 if (rv == 0) { 246 l->l_pflag &= ~LP_SA_PAGEFAULT; 247 break; 248 } 249 KSI_INIT_TRAP(&ksi); 250 ksi.ksi_signo = SIGSEGV; 251 ksi.ksi_trap = EXC_DSI; 252 ksi.ksi_addr = (void *)frame->dar; 253 if (rv == ENOMEM) { 254 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 255 "out of swap\n", 256 p->p_pid, p->p_comm, l->l_lid, 257 l->l_cred ? 258 kauth_cred_geteuid(l->l_cred) : -1); 259 ksi.ksi_signo = SIGKILL; 260 } 261 trapsignal(l, &ksi); 262 l->l_pflag &= ~LP_SA_PAGEFAULT; 263 break; 264 265 case EXC_ITMISS|EXC_USER: 266 case EXC_ISI|EXC_USER: 267 if (l->l_flag & LW_SA) { 268 l->l_savp->savp_faultaddr = (vaddr_t)frame->srr0; 269 l->l_pflag |= LP_SA_PAGEFAULT; 270 } 271 ftype = VM_PROT_EXECUTE; 272 DBPRINTF(TDB_ALL, 273 ("trap(EXC_ISI|EXC_USER) at %lx execute fault tf %p\n", 274 frame->srr0, frame)); 275 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->srr0), 276 ftype); 277 if (rv == 0) { 278 l->l_pflag &= ~LP_SA_PAGEFAULT; 279 break; 280 } 281 KSI_INIT_TRAP(&ksi); 282 ksi.ksi_signo = SIGSEGV; 283 ksi.ksi_trap = EXC_ISI; 284 ksi.ksi_addr = (void *)frame->srr0; 285 ksi.ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 286 trapsignal(l, &ksi); 287 l->l_pflag &= ~LP_SA_PAGEFAULT; 288 break; 289 290 case EXC_AST|EXC_USER: 291 curcpu()->ci_astpending = 0; /* we are about to do it */ 292 uvmexp.softs++; 293 if (l->l_pflag & LP_OWEUPC) { 294 l->l_pflag &= ~LP_OWEUPC; 295 ADDUPROF(l); 296 } 297 /* Check whether we are being preempted. */ 298 if (curcpu()->ci_want_resched) 299 preempt(); 300 break; 301 302 303 case EXC_ALI|EXC_USER: 304 if (fix_unaligned(l, frame) != 0) { 305 KSI_INIT_TRAP(&ksi); 306 ksi.ksi_signo = SIGBUS; 307 ksi.ksi_trap = EXC_ALI; 308 ksi.ksi_addr = (void *)frame->dar; 309 trapsignal(l, &ksi); 310 } else 311 frame->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 uvmexp.traps++; 321 pcb = lwp_getpcb(l); 322 323 if (!(pcb->pcb_flags & PCB_FPU)) { 324 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 325 pcb->pcb_flags |= PCB_FPU; 326 } 327 328 if ((rv = fpu_emulate(frame, (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 *)frame->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 frame->tf_xtra[TF_PID] = KERNEL_PID; 344 frame->srr0 = fb->fb_pc; 345 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 346 frame->fixreg[1] = fb->fb_sp; 347 frame->fixreg[2] = fb->fb_r2; 348 frame->fixreg[3] = 1; /* Return TRUE */ 349 frame->cr = fb->fb_cr; 350 memcpy(&frame->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, frame->srr0); 359 #if defined(DDB) || defined(KGDB) 360 if (kdb_trap(type, frame)) 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 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 (setfault(&env)) { 429 curpcb->pcb_onfault = 0; 430 return EFAULT; 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 = 0; 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 int error; 490 491 if (!l) { 492 return EFAULT; 493 } 494 495 p = l->l_proc; 496 497 /* 498 * Stolen from physio(): 499 */ 500 error = uvm_vslock(p->p_vmspace, __UNCONST(udaddr), len, VM_PROT_READ); 501 if (error) { 502 return EFAULT; 503 } 504 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 505 506 memcpy(kp, up, len); 507 vunmaprange((vaddr_t)up, len); 508 uvm_vsunlock(p->p_vmspace, __UNCONST(udaddr), len); 509 510 return 0; 511 } 512 513 int 514 copyout(const void *kaddr, void *udaddr, size_t len) 515 { 516 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 517 int msr, pid, tmp, ctx, count=0; 518 struct faultbuf env; 519 520 /* For big copies use more efficient routine */ 521 if (len > 1024) 522 return (bigcopyout(kaddr, udaddr, len)); 523 524 if (setfault(&env)) { 525 curpcb->pcb_onfault = 0; 526 return EFAULT; 527 } 528 529 if (!(ctx = pm->pm_ctx)) { 530 /* No context -- assign it one */ 531 ctx_alloc(pm); 532 ctx = pm->pm_ctx; 533 } 534 535 __asm volatile( 536 " mfmsr %[msr];" /* Save MSR */ \ 537 " li %[pid],0x20; " \ 538 " andc %[pid],%[msr],%[pid]; mtmsr %[pid];" /* Disable IMMU */ \ 539 " mfpid %[pid];" /* Save old PID */ \ 540 " sync; isync;" 541 542 " srwi. %[count],%[len],0x2;" /* How many words? */ 543 " beq- 2f;" /* No words. Go do bytes */ 544 " mtctr %[count];" 545 "1: mtpid %[pid];sync;" 546 " lswi %[tmp],%[kaddr],4;" /* Load kernel word */ 547 " addi %[kaddr],%[kaddr],0x4;" /* next kaddr word */ 548 " sync; isync;" 549 " mtpid %[ctx]; sync;" 550 " stswi %[tmp],%[udaddr],4;" /* Store user word */ 551 " dcbf 0,%[udaddr];" /* flush cache */ 552 " addi %[udaddr],%[udaddr],0x4;" /* next udaddr word */ 553 " sync; isync;" 554 " bdnz 1b;" /* repeat */ 555 556 "2: andi. %[count],%[len],0x3;" /* How many remaining bytes? */ 557 " addi %[count],%[count],0x1;" 558 " mtctr %[count];" 559 "3: bdz 10f;" /* while count */ 560 " mtpid %[pid];sync;" 561 " lbz %[tmp],0(%[kaddr]);" /* Load kernel byte */ 562 " addi %[kaddr],%[kaddr],0x1;" /* next kaddr byte */ 563 " sync; isync;" 564 " mtpid %[ctx]; sync;" 565 " stb %[tmp],0(%[udaddr]);" /* Store user byte */ 566 " dcbf 0,%[udaddr];" /* flush cache */ 567 " addi %[udaddr],%[udaddr],0x1;" 568 " sync; isync;" 569 " b 3b;" 570 "10:mtpid %[pid]; mtmsr %[msr]; sync; isync;" /* Restore PID and MSR */ 571 : [msr] "=&r" (msr), [pid] "=&r" (pid), [tmp] "=&r" (tmp) 572 : [udaddr] "b" (udaddr), [ctx] "b" (ctx), [kaddr] "b" (kaddr), [len] "b" (len), [count] "b" (count)); 573 574 curpcb->pcb_onfault = 0; 575 return 0; 576 } 577 578 static int 579 bigcopyout(const void *kaddr, void *udaddr, size_t len) 580 { 581 char *up; 582 const char *kp = (const char *)kaddr; 583 struct lwp *l = curlwp; 584 struct proc *p; 585 int error; 586 587 if (!l) { 588 return EFAULT; 589 } 590 591 p = l->l_proc; 592 593 /* 594 * Stolen from physio(): 595 */ 596 error = uvm_vslock(p->p_vmspace, udaddr, len, VM_PROT_WRITE); 597 if (error) { 598 return EFAULT; 599 } 600 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 601 VM_PROT_READ | VM_PROT_WRITE); 602 603 memcpy(up, kp, len); 604 vunmaprange((vaddr_t)up, len); 605 uvm_vsunlock(p->p_vmspace, udaddr, len); 606 607 return 0; 608 } 609 610 /* 611 * kcopy(const void *src, void *dst, size_t len); 612 * 613 * Copy len bytes from src to dst, aborting if we encounter a fatal 614 * page fault. 615 * 616 * kcopy() _must_ save and restore the old fault handler since it is 617 * called by uiomove(), which may be in the path of servicing a non-fatal 618 * page fault. 619 */ 620 int 621 kcopy(const void *src, void *dst, size_t len) 622 { 623 struct faultbuf env, *oldfault; 624 625 oldfault = curpcb->pcb_onfault; 626 if (setfault(&env)) { 627 curpcb->pcb_onfault = oldfault; 628 return EFAULT; 629 } 630 631 memcpy(dst, src, len); 632 633 curpcb->pcb_onfault = oldfault; 634 return 0; 635 } 636 637 int 638 badaddr(void *addr, size_t size) 639 { 640 641 return badaddr_read(addr, size, NULL); 642 } 643 644 int 645 badaddr_read(void *addr, size_t size, int *rptr) 646 { 647 struct faultbuf env; 648 int x; 649 650 /* Get rid of any stale machine checks that have been waiting. */ 651 __asm volatile ("sync; isync"); 652 653 if (setfault(&env)) { 654 curpcb->pcb_onfault = 0; 655 __asm volatile ("sync"); 656 return 1; 657 } 658 659 __asm volatile ("sync"); 660 661 switch (size) { 662 case 1: 663 x = *(volatile int8_t *)addr; 664 break; 665 case 2: 666 x = *(volatile int16_t *)addr; 667 break; 668 case 4: 669 x = *(volatile int32_t *)addr; 670 break; 671 default: 672 panic("badaddr: invalid size (%d)", size); 673 } 674 675 /* Make sure we took the machine check, if we caused one. */ 676 __asm volatile ("sync; isync"); 677 678 curpcb->pcb_onfault = 0; 679 __asm volatile ("sync"); /* To be sure. */ 680 681 /* Use the value to avoid reorder. */ 682 if (rptr) 683 *rptr = x; 684 685 return 0; 686 } 687 688 /* 689 * For now, this only deals with the particular unaligned access case 690 * that gcc tends to generate. Eventually it should handle all of the 691 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 692 */ 693 694 static int 695 fix_unaligned(struct lwp *l, struct trapframe *frame) 696 { 697 698 return -1; 699 } 700 701 /* 702 * Start a new LWP 703 */ 704 void 705 startlwp(void *arg) 706 { 707 int err; 708 ucontext_t *uc = arg; 709 struct lwp *l = curlwp; 710 711 err = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); 712 #if DIAGNOSTIC 713 if (err) { 714 printf("Error %d from cpu_setmcontext.", err); 715 } 716 #endif 717 pool_put(&lwp_uc_pool, uc); 718 719 upcallret(l); 720 } 721 722 /* 723 * XXX This is a terrible name. 724 */ 725 void 726 upcallret(struct lwp *l) 727 { 728 729 /* Invoke MI userret code */ 730 mi_userret(l); 731 } 732
Indexes created Wed Sep 24 05:09:52 GMT 2025