trap.c revision 1.1.2.4
1 /* $NetBSD: trap.c,v 1.1.2.4 2011/07/26 03:42:21 matt Exp $ */ 2 /*- 3 * Copyright (c) 2010, 2011 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Raytheon BBN Technologies Corp and Defense Advanced Research Projects 8 * Agency and which was developed by Matt Thomas of 3am Software Foundry. 9 * 10 * This material is based upon work supported by the Defense Advanced Research 11 * Projects Agency and Space and Naval Warfare Systems Center, Pacific, under 12 * Contract No. N66001-09-C-2073. 13 * Approved for Public Release, Distribution Unlimited 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include "opt_ddb.h" 38 #include "opt_sa.h" 39 40 #include <sys/cdefs.h> 41 42 __KERNEL_RCSID(1, "$NetBSD: trap.c,v 1.1.2.4 2011/07/26 03:42:21 matt Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/siginfo.h> 47 #include <sys/user.h> 48 #include <sys/lwp.h> 49 #include <sys/proc.h> 50 #include <sys/cpu.h> 51 #ifdef KERN_SA 52 #include <sys/savar.h> 53 #endif 54 #include <sys/kauth.h> 55 #include <sys/kmem.h> 56 #include <sys/ras.h> 57 58 #include <uvm/uvm_extern.h> 59 60 #include <powerpc/pcb.h> 61 #include <powerpc/userret.h> 62 #include <powerpc/psl.h> 63 #include <powerpc/instr.h> 64 #include <powerpc/altivec.h> /* use same interface for SPE */ 65 66 #include <powerpc/spr.h> 67 #include <powerpc/booke/spr.h> 68 69 #include <powerpc/db_machdep.h> 70 #include <ddb/db_interface.h> 71 72 #include <powerpc/trap.h> 73 #include <powerpc/booke/trap.h> 74 #include <powerpc/booke/pte.h> 75 76 void trap(enum ppc_booke_exceptions, struct trapframe *); 77 static void dump_trapframe(const struct trapframe *); 78 79 static const char trap_names[][8] = { 80 [T_CRITIAL_INPUT] = "CRIT", 81 [T_EXTERNAL_INPUT] = "EXT", 82 [T_DECREMENTER] = "DECR", 83 [T_FIXED_INTERVAL] = "FIT", 84 [T_WATCHDOG] = "WDOG", 85 [T_SYSTEM_CALL] = "SC", 86 [T_MACHINE_CHECK] = "MCHK", 87 [T_DSI] = "DSI", 88 [T_ISI] = "ISI", 89 [T_ALIGNMENT] = "ALN", 90 [T_PROGRAM] = "PGM", 91 [T_FP_UNAVAILABLE] = "FP", 92 [T_AP_UNAVAILABLE] = "AP", 93 [T_DATA_TLB_ERROR] = "DTLB", 94 [T_INSTRUCTION_TLB_ERROR] = "ITLB", 95 [T_DEBUG] = "DEBUG", 96 [T_SPE_UNAVAILABLE] = "SPE", 97 [T_EMBEDDED_FP_DATA] = "FPDATA", 98 [T_EMBEDDED_FP_ROUND] = "FPROUND", 99 [T_EMBEDDED_PERF_MONITOR] = "PERFMON", 100 [T_AST] = "AST", 101 }; 102 103 static inline bool 104 usertrap_p(struct trapframe *tf) 105 { 106 return (tf->tf_srr1 & PSL_PR) != 0; 107 } 108 109 static int 110 mchk_exception(struct trapframe *tf, ksiginfo_t *ksi) 111 { 112 const bool usertrap = usertrap_p(tf); 113 const vaddr_t faultva = tf->tf_mcar; 114 struct cpu_info * const ci = curcpu(); 115 int rv = EFAULT; 116 117 if (usertrap) 118 ci->ci_ev_umchk.ev_count++; 119 120 if (rv != 0 && usertrap) { 121 KSI_INIT_TRAP(ksi); 122 ksi->ksi_signo = SIGSEGV; 123 ksi->ksi_trap = EXC_DSI; 124 ksi->ksi_code = SEGV_ACCERR; 125 ksi->ksi_addr = (void *)faultva; 126 } 127 128 return rv; 129 } 130 131 static inline vm_prot_t 132 get_faulttype(const struct trapframe * const tf) 133 { 134 return VM_PROT_READ | (tf->tf_esr & ESR_ST ? VM_PROT_WRITE : 0); 135 } 136 137 static inline struct vm_map * 138 get_faultmap(const struct trapframe * const tf, register_t psl_mask) 139 { 140 return (tf->tf_srr1 & psl_mask) 141 ? &curlwp->l_proc->p_vmspace->vm_map 142 : kernel_map; 143 } 144 145 /* 146 * We could use pmap_pte_lookip but this slightly faster since we already 147 * the segtab pointers in cpu_info. 148 */ 149 static inline pt_entry_t * 150 trap_pte_lookup(struct trapframe *tf, vaddr_t va, register_t psl_mask) 151 { 152 struct pmap_segtab ** const stps = &curcpu()->ci_pmap_kern_segtab; 153 struct pmap_segtab * const stp = stps[(tf->tf_srr1 / psl_mask) & 1]; 154 if (__predict_false(stp == NULL)) 155 return NULL; 156 pt_entry_t *ptep = stp->seg_tab[va >> SEGSHIFT]; 157 if (__predict_false(ptep == NULL)) 158 return NULL; 159 return ptep + ((va & SEGOFSET) >> PAGE_SHIFT); 160 } 161 162 static int 163 pagefault(struct vm_map *map, vaddr_t va, vm_prot_t ftype, bool usertrap) 164 { 165 struct lwp * const l = curlwp; 166 int rv; 167 168 // printf("%s(%p,%#lx,%u,%u)\n", __func__, map, va, ftype, usertrap); 169 170 if (usertrap) { 171 #ifdef KERN_SA 172 if (l->l_flag & LW_SA) { 173 l->l_savp->savp_faultaddr = va; 174 l->l_pflag |= LP_SA_PAGEFAULT; 175 } 176 #endif 177 rv = uvm_fault(map, trunc_page(va), ftype); 178 if (rv == 0) 179 uvm_grow(l->l_proc, trunc_page(va)); 180 #ifdef KERN_SA 181 l->l_pflag &= ~LP_SA_PAGEFAULT; 182 #endif 183 } else { 184 if (cpu_intr_p()) 185 return EFAULT; 186 187 struct pcb * const pcb = lwp_getpcb(l); 188 struct faultbuf * const fb = pcb->pcb_onfault; 189 pcb->pcb_onfault = NULL; 190 rv = uvm_fault(map, trunc_page(va), ftype); 191 pcb->pcb_onfault = fb; 192 if (map != kernel_map) { 193 if (rv == 0) 194 uvm_grow(l->l_proc, trunc_page(va)); 195 #ifdef KERN_SA 196 l->l_pflag &= ~LP_SA_PAGEFAULT; 197 #endif 198 } 199 if (rv == EACCES) 200 rv = EFAULT; 201 } 202 return rv; 203 } 204 205 static int 206 dsi_exception(struct trapframe *tf, ksiginfo_t *ksi) 207 { 208 const vaddr_t faultva = tf->tf_dear; 209 const vm_prot_t ftype = get_faulttype(tf); 210 struct vm_map * const faultmap = get_faultmap(tf, PSL_DS); 211 const bool usertrap = usertrap_p(tf); 212 213 kpreempt_disable(); 214 struct cpu_info * const ci = curcpu(); 215 216 if (usertrap) 217 ci->ci_ev_udsi.ev_count++; 218 else 219 ci->ci_ev_kdsi.ev_count++; 220 221 /* 222 * If we had a TLB entry (which we must have had to get this exception), 223 * we certainly have a PTE. 224 */ 225 pt_entry_t * const ptep = trap_pte_lookup(tf, trunc_page(faultva), 226 PSL_DS); 227 KASSERT(ptep != NULL); 228 pt_entry_t pte = *ptep; 229 230 if ((ftype & VM_PROT_WRITE) 231 && ((pte & (PTE_xW|PTE_UNMODIFIED)) == (PTE_xW|PTE_UNMODIFIED))) { 232 const paddr_t pa = pte_to_paddr(pte); 233 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 234 KASSERT(pg); 235 236 if (!VM_PAGE_MD_MODIFIED_P(pg)) { 237 pmap_page_set_attributes(pg, VM_PAGE_MD_MODIFIED); 238 } 239 pte &= ~PTE_UNMODIFIED; 240 *ptep = pte; 241 pmap_tlb_update_addr(faultmap->pmap, trunc_page(faultva), 242 pte, 0); 243 kpreempt_enable(); 244 return 0; 245 } 246 kpreempt_enable(); 247 248 int rv = pagefault(faultmap, faultva, ftype, usertrap); 249 250 /* 251 * We can't get a MAPERR here since that's a different exception. 252 */ 253 if (__predict_false(rv != 0 && usertrap)) { 254 ci->ci_ev_udsi_fatal.ev_count++; 255 KSI_INIT_TRAP(ksi); 256 ksi->ksi_signo = SIGSEGV; 257 ksi->ksi_trap = EXC_DSI; 258 ksi->ksi_code = SEGV_ACCERR; 259 ksi->ksi_addr = (void *)faultva; 260 } 261 return rv; 262 } 263 264 static int 265 isi_exception(struct trapframe *tf, ksiginfo_t *ksi) 266 { 267 const vaddr_t faultva = trunc_page(tf->tf_srr0); 268 struct vm_map * const faultmap = get_faultmap(tf, PSL_IS); 269 const bool usertrap = usertrap_p(tf); 270 271 kpreempt_disable(); 272 struct cpu_info * const ci = curcpu(); 273 274 if (usertrap) 275 ci->ci_ev_isi.ev_count++; 276 else 277 ci->ci_ev_kisi.ev_count++; 278 279 /* 280 * If we had a TLB entry (which we must have had to get this exception), 281 * we certainly have a PTE. 282 */ 283 pt_entry_t * const ptep = trap_pte_lookup(tf, trunc_page(faultva), 284 PSL_IS); 285 if (ptep == NULL) 286 dump_trapframe(tf); 287 KASSERT(ptep != NULL); 288 pt_entry_t pte = *ptep; 289 290 if ((pte & PTE_UNSYNCED) == PTE_UNSYNCED) { 291 const paddr_t pa = pte_to_paddr(pte); 292 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 293 KASSERT(pg); 294 295 if (!VM_PAGE_MD_EXECPAGE_P(pg)) { 296 ci->ci_softc->cpu_ev_exec_trap_sync.ev_count++; 297 dcache_wb_page(pa); 298 icache_inv_page(pa); 299 pmap_page_set_attributes(pg, VM_PAGE_MD_EXECPAGE); 300 } 301 pte &= ~PTE_UNSYNCED; 302 pte |= PTE_xX; 303 *ptep = pte; 304 pmap_tlb_update_addr(faultmap->pmap, trunc_page(faultva), 305 pte, 0); 306 kpreempt_enable(); 307 return false; 308 } 309 kpreempt_enable(); 310 311 int rv = pagefault(faultmap, faultva, VM_PROT_READ|VM_PROT_EXECUTE, 312 usertrap); 313 314 if (__predict_false(rv != 0 && usertrap)) { 315 /* 316 * We can't get a MAPERR here since 317 * that's a different exception. 318 */ 319 ci->ci_ev_isi_fatal.ev_count++; 320 KSI_INIT_TRAP(ksi); 321 ksi->ksi_signo = SIGSEGV; 322 ksi->ksi_trap = EXC_ISI; 323 ksi->ksi_code = SEGV_ACCERR; 324 ksi->ksi_addr = (void *)tf->tf_srr0; /* not truncated */ 325 } 326 return rv; 327 } 328 329 static int 330 dtlb_exception(struct trapframe *tf, ksiginfo_t *ksi) 331 { 332 const vaddr_t faultva = tf->tf_dear; 333 const vm_prot_t ftype = get_faulttype(tf); 334 struct vm_map * const faultmap = get_faultmap(tf, PSL_DS); 335 struct cpu_info * const ci = curcpu(); 336 const bool usertrap = usertrap_p(tf); 337 338 #if 0 339 /* 340 * This is what pte_load in trap_subr.S does for us. 341 */ 342 const pt_entry_t * const ptep = 343 trap_pte_lookup(tf, trunc_page(faultva), PSL_DS); 344 if (ptep != NULL && !usertrap && pte_valid_p(*ptep)) { 345 tlb_update_addr(trunc_page(faultva), KERNEL_PID, *ptep, true); 346 ci->ci_ev_tlbmiss_soft.ev_count++; 347 return 0; 348 } 349 #endif 350 351 ci->ci_ev_dtlbmiss_hard.ev_count++; 352 353 // printf("pagefault(%p,%#lx,%u,%u)", faultmap, faultva, ftype, usertrap); 354 int rv = pagefault(faultmap, faultva, ftype, usertrap); 355 // printf(": %d\n", rv); 356 357 if (__predict_false(rv != 0 && usertrap)) { 358 ci->ci_ev_udsi_fatal.ev_count++; 359 KSI_INIT_TRAP(ksi); 360 ksi->ksi_signo = SIGSEGV; 361 ksi->ksi_trap = EXC_DSI; 362 ksi->ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 363 ksi->ksi_addr = (void *)faultva; 364 } 365 return rv; 366 } 367 368 static int 369 itlb_exception(struct trapframe *tf, ksiginfo_t *ksi) 370 { 371 struct vm_map * const faultmap = get_faultmap(tf, PSL_IS); 372 const vaddr_t faultva = tf->tf_srr0; 373 struct cpu_info * const ci = curcpu(); 374 const bool usertrap = usertrap_p(tf); 375 376 ci->ci_ev_itlbmiss_hard.ev_count++; 377 378 int rv = pagefault(faultmap, faultva, VM_PROT_READ|VM_PROT_EXECUTE, 379 usertrap); 380 381 if (__predict_false(rv != 0 && usertrap)) { 382 ci->ci_ev_isi_fatal.ev_count++; 383 KSI_INIT_TRAP(ksi); 384 ksi->ksi_signo = SIGSEGV; 385 ksi->ksi_trap = EXC_ISI; 386 ksi->ksi_code = (rv == EACCES ? SEGV_ACCERR : SEGV_MAPERR); 387 ksi->ksi_addr = (void *)tf->tf_srr0; 388 } 389 return rv; 390 } 391 392 static int 393 spe_exception(struct trapframe *tf, ksiginfo_t *ksi) 394 { 395 struct cpu_info * const ci = curcpu(); 396 397 if (!usertrap_p(tf)) 398 return EPERM; 399 400 ci->ci_ev_vec.ev_count++; 401 402 #ifdef PPC_HAVE_SPE 403 vec_enable(); 404 return 0; 405 #else 406 KSI_INIT_TRAP(ksi); 407 ksi->ksi_signo = SIGILL; 408 ksi->ksi_trap = EXC_PGM; 409 ksi->ksi_code = ILL_ILLOPC; 410 ksi->ksi_addr = (void *)tf->tf_srr0; 411 return EPERM; 412 #endif 413 } 414 415 static bool 416 emulate_opcode(struct trapframe *tf, ksiginfo_t *ksi) 417 { 418 uint32_t opcode; 419 if (copyin((void *)tf->tf_srr0, &opcode, sizeof(opcode)) != 0) 420 return false; 421 422 if (opcode == OPC_LWSYNC) 423 return true; 424 425 if (OPC_MFSPR_P(opcode, SPR_PVR)) { 426 __asm ("mfpvr %0" : "=r"(tf->tf_fixreg[OPC_MFSPR_REG(opcode)])); 427 return true; 428 } 429 430 /* 431 * If we bothered to emulate FP, we would try to do so here. 432 */ 433 return false; 434 } 435 436 static int 437 pgm_exception(struct trapframe *tf, ksiginfo_t *ksi) 438 { 439 struct cpu_info * const ci = curcpu(); 440 int rv = EPERM; 441 442 if (!usertrap_p(tf)) 443 return rv; 444 445 ci->ci_ev_pgm.ev_count++; 446 447 if (tf->tf_esr & ESR_PTR) { 448 struct proc *p = curlwp->l_proc; 449 if (p->p_raslist != NULL 450 && ras_lookup(p, (void *)tf->tf_srr0) != (void *) -1) { 451 tf->tf_srr0 += 4; 452 return 0; 453 } 454 } else if (tf->tf_esr & (ESR_PIL|ESR_PPR)) { 455 if (emulate_opcode(tf, ksi)) { 456 tf->tf_srr0 += 4; 457 return 0; 458 } 459 } 460 461 KSI_INIT_TRAP(ksi); 462 ksi->ksi_signo = SIGILL; 463 ksi->ksi_trap = EXC_PGM; 464 if (tf->tf_esr & ESR_PIL) 465 ksi->ksi_code = ILL_ILLOPC; 466 else if (tf->tf_esr & ESR_PPR) 467 ksi->ksi_code = ILL_PRVOPC; 468 else if (tf->tf_esr & ESR_PTR) 469 ksi->ksi_code = ILL_ILLTRP; 470 else 471 ksi->ksi_code = 0; 472 ksi->ksi_addr = (void *)tf->tf_srr0; 473 return rv; 474 } 475 476 static int 477 ali_exception(struct trapframe *tf, ksiginfo_t *ksi) 478 { 479 struct cpu_info * const ci = curcpu(); 480 int rv = EFAULT; 481 482 ci->ci_ev_ali.ev_count++; 483 484 if (rv != 0 && usertrap_p(tf)) { 485 ci->ci_ev_ali_fatal.ev_count++; 486 KSI_INIT_TRAP(ksi); 487 ksi->ksi_signo = SIGILL; 488 ksi->ksi_trap = EXC_PGM; 489 if (tf->tf_esr & ESR_PIL) 490 ksi->ksi_code = ILL_ILLOPC; 491 else if (tf->tf_esr & ESR_PPR) 492 ksi->ksi_code = ILL_PRVOPC; 493 else if (tf->tf_esr & ESR_PTR) 494 ksi->ksi_code = ILL_ILLTRP; 495 else 496 ksi->ksi_code = 0; 497 ksi->ksi_addr = (void *)tf->tf_srr0; 498 } 499 return rv; 500 } 501 502 static int 503 embedded_fp_data_exception(struct trapframe *tf, ksiginfo_t *ksi) 504 { 505 struct cpu_info * const ci = curcpu(); 506 int rv = EFAULT; 507 508 ci->ci_ev_fpu.ev_count++; 509 510 if (rv != 0 && usertrap_p(tf)) { 511 KSI_INIT_TRAP(ksi); 512 #ifdef PPC_HAVE_SPE 513 ksi->ksi_signo = SIGFPE; 514 ksi->ksi_trap = tf->tf_exc; 515 ksi->ksi_code = vec_siginfo_code(tf); 516 #else 517 ksi->ksi_signo = SIGILL; 518 ksi->ksi_trap = EXC_PGM; 519 ksi->ksi_code = ILL_ILLOPC; 520 #endif 521 ksi->ksi_addr = (void *)tf->tf_srr0; 522 } 523 return rv; 524 } 525 526 static int 527 embedded_fp_round_exception(struct trapframe *tf, ksiginfo_t *ksi) 528 { 529 struct cpu_info * const ci = curcpu(); 530 int rv = EDOM; 531 532 ci->ci_ev_fpu.ev_count++; 533 534 if (rv != 0 && usertrap_p(tf)) { 535 KSI_INIT_TRAP(ksi); 536 #ifdef PPC_HAVE_SPE 537 ksi->ksi_signo = SIGFPE; 538 ksi->ksi_trap = tf->tf_exc; 539 ksi->ksi_code = vec_siginfo_code(tf); 540 #else 541 ksi->ksi_signo = SIGILL; 542 ksi->ksi_trap = EXC_PGM; 543 ksi->ksi_code = ILL_ILLOPC; 544 #endif 545 ksi->ksi_addr = (void *)tf->tf_srr0; 546 } 547 return rv; 548 } 549 550 static void 551 dump_trapframe(const struct trapframe *tf) 552 { 553 printf("trapframe %p (exc=%x srr0/1=%#lx/%#lx esr/dear=%#x/%#lx)\n", 554 tf, tf->tf_exc, tf->tf_srr0, tf->tf_srr1, tf->tf_esr, tf->tf_dear); 555 printf("lr =%08lx ctr=%08lx cr =%08x xer=%08x\n", 556 tf->tf_lr, tf->tf_ctr, tf->tf_cr, tf->tf_xer); 557 for (u_int r = 0; r < 32; r += 4) { 558 printf("r%02u=%08lx r%02u=%08lx r%02u=%08lx r%02u=%08lx\n", 559 r+0, tf->tf_fixreg[r+0], r+1, tf->tf_fixreg[r+1], 560 r+2, tf->tf_fixreg[r+2], r+3, tf->tf_fixreg[r+3]); 561 } 562 } 563 static bool 564 ddb_exception(struct trapframe *tf) 565 { 566 #if 0 567 const register_t ddb_trapfunc = (uintptr_t) cpu_Debugger; 568 if ((tf->tf_esr & ESR_PTR) == 0) 569 return false; 570 if (ddb_trapfunc <= tf->tf_srr0 && tf->tf_srr0 <= ddb_trapfunc+16) { 571 register_t srr0 = tf->tf_srr0; 572 if (kdb_trap(tf->tf_exc, tf)) { 573 if (srr0 == tf->tf_srr0) 574 tf->tf_srr0 += 4; 575 return true; 576 } 577 } 578 return false; 579 #else 580 struct cpu_info * const ci = curcpu(); 581 struct cpu_softc * const cpu = ci->ci_softc; 582 printf("CPL stack:"); 583 if (ci->ci_idepth >= 0) { 584 for (u_int i = 0; i <= ci->ci_idepth; i++) { 585 printf(" [%u]=%u", i, cpu->cpu_pcpls[i]); 586 } 587 } 588 printf(" %u\n", ci->ci_cpl); 589 dump_trapframe(tf); 590 if (kdb_trap(tf->tf_exc, tf)) { 591 tf->tf_srr0 += 4; 592 return true; 593 } 594 return false; 595 #endif 596 } 597 598 static bool 599 onfaulted(struct trapframe *tf, register_t rv) 600 { 601 struct lwp * const l = curlwp; 602 struct pcb * const pcb = lwp_getpcb(l); 603 struct faultbuf * const fb = pcb->pcb_onfault; 604 if (fb == NULL) 605 return false; 606 tf->tf_srr0 = fb->fb_pc; 607 tf->tf_srr1 = fb->fb_msr; 608 tf->tf_cr = fb->fb_cr; 609 tf->tf_fixreg[1] = fb->fb_sp; 610 tf->tf_fixreg[2] = fb->fb_r2; 611 tf->tf_fixreg[3] = rv; 612 pcb->pcb_onfault = NULL; 613 return true; 614 } 615 616 void 617 trap(enum ppc_booke_exceptions trap_code, struct trapframe *tf) 618 { 619 const bool usertrap = usertrap_p(tf); 620 struct cpu_info * const ci = curcpu(); 621 struct lwp * const l = curlwp; 622 struct proc * const p = l->l_proc; 623 ksiginfo_t ksi; 624 int rv = EACCES; 625 626 ci->ci_ev_traps.ev_count++; 627 ci->ci_data.cpu_ntrap++; 628 629 KASSERTMSG(!usertrap || tf == trapframe(l), 630 ("trap: tf=%p is invalid: trapframe(%p)=%p", tf, l, trapframe(l))); 631 632 #if 0 633 if (trap_code != T_PROGRAM || usertrap) 634 printf("trap(enter): %s (tf=%p, esr/dear=%#x/%#lx, srr0/1=%#lx/%#lx, lr=%#lx)\n", 635 trap_names[trap_code], tf, tf->tf_esr, tf->tf_dear, 636 tf->tf_srr0, tf->tf_srr1, tf->tf_lr); 637 #endif 638 #if 0 639 if ((register_t)tf >= (register_t)l->l_addr + USPACE 640 || (register_t)tf < (register_t)l->l_addr + PAGE_SIZE) { 641 printf("%s(entry): pid %d.%d (%s): invalid tf addr %p\n", 642 __func__, p->p_pid, l->l_lid, p->p_comm, tf); 643 dump_trapframe(tf); 644 Debugger(); 645 } 646 #endif 647 #if 0 648 if ((mfmsr() & PSL_CE) == 0) { 649 printf("%s(entry): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 650 __func__, p->p_pid, l->l_lid, p->p_comm, 651 trap_names[trap_code], mfmsr()); 652 dump_trapframe(tf); 653 } 654 #endif 655 656 #if 0 657 if (usertrap && (tf->tf_srr1 & (PSL_DS|PSL_IS)) != (PSL_DS|PSL_IS)) { 658 printf("%s(entry): pid %d.%d (%s): %s invalid PSL %#lx\n", 659 __func__, p->p_pid, l->l_lid, p->p_comm, 660 trap_names[trap_code], tf->tf_srr1); 661 dump_trapframe(tf); 662 Debugger(); 663 } 664 #endif 665 666 if (usertrap) { 667 LWP_CACHE_CREDS(l, p); 668 } 669 670 671 switch (trap_code) { 672 case T_CRITIAL_INPUT: 673 case T_EXTERNAL_INPUT: 674 case T_DECREMENTER: 675 case T_FIXED_INTERVAL: 676 case T_WATCHDOG: 677 case T_SYSTEM_CALL: 678 default: 679 panic("trap: unexcepted trap code %d! (tf=%p, srr0/1=%#lx/%#lx)", 680 trap_code, tf, tf->tf_srr0, tf->tf_srr1); 681 case T_MACHINE_CHECK: 682 rv = mchk_exception(tf, &ksi); 683 break; 684 case T_DSI: 685 rv = dsi_exception(tf, &ksi); 686 break; 687 case T_ISI: 688 rv = isi_exception(tf, &ksi); 689 break; 690 case T_ALIGNMENT: 691 rv = ali_exception(tf, &ksi); 692 break; 693 case T_SPE_UNAVAILABLE: 694 rv = spe_exception(tf, &ksi); 695 break; 696 case T_PROGRAM: 697 #ifdef DDB 698 if (!usertrap && ddb_exception(tf)) 699 return; 700 #endif 701 rv = pgm_exception(tf, &ksi); 702 break; 703 case T_FP_UNAVAILABLE: 704 case T_AP_UNAVAILABLE: 705 panic("trap: unexcepted trap code %d! (tf=%p, srr0/1=%#lx/%#lx)", 706 trap_code, tf, tf->tf_srr0, tf->tf_srr1); 707 case T_DATA_TLB_ERROR: 708 rv = dtlb_exception(tf, &ksi); 709 break; 710 case T_INSTRUCTION_TLB_ERROR: 711 rv = itlb_exception(tf, &ksi); 712 break; 713 case T_DEBUG: 714 case T_EMBEDDED_FP_DATA: 715 rv = embedded_fp_data_exception(tf, &ksi); 716 break; 717 case T_EMBEDDED_FP_ROUND: 718 rv = embedded_fp_round_exception(tf, &ksi); 719 break; 720 case T_EMBEDDED_PERF_MONITOR: 721 //db_stack_trace_print(tf->tf_fixreg[1], true, 40, "", printf); 722 dump_trapframe(tf); 723 rv = EPERM; 724 break; 725 case T_AST: 726 KASSERT(usertrap); 727 ci->ci_astpending = 0; /* we are about to do it */ 728 ci->ci_data.cpu_nsoft++; 729 if (l->l_pflag & LP_OWEUPC) { 730 l->l_pflag &= ~LP_OWEUPC; 731 ADDUPROF(l); 732 } 733 /* Check whether we are being preempted. */ 734 if (ci->ci_want_resched) 735 preempt(); 736 if (tf->tf_fixreg[1] & 0x80000000) { 737 printf("%s(ast-exit): pid %d.%d (%s): invalid sp %#lx\n", 738 __func__, p->p_pid, l->l_lid, p->p_comm, 739 tf->tf_fixreg[1]); 740 dump_trapframe(tf); 741 Debugger(); 742 } 743 if ((tf->tf_srr1 & (PSL_DS|PSL_IS)) != (PSL_DS|PSL_IS)) { 744 printf("%s(entry): pid %d.%d (%s): %s invalid PSL %#lx\n", 745 __func__, p->p_pid, l->l_lid, p->p_comm, 746 trap_names[trap_code], tf->tf_srr1); 747 dump_trapframe(tf); 748 Debugger(); 749 } 750 #if 0 751 if ((mfmsr() & PSL_CE) == 0) { 752 printf("%s(exit): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 753 __func__, p->p_pid, l->l_lid, p->p_comm, 754 trap_names[trap_code], mfmsr()); 755 dump_trapframe(tf); 756 } 757 #endif 758 userret(l, tf); 759 return; 760 } 761 if (!usertrap) { 762 if (rv != 0) { 763 if (!onfaulted(tf, rv)) { 764 db_stack_trace_print(tf->tf_fixreg[1], true, 40, "", printf); 765 dump_trapframe(tf); 766 panic("%s: pid %d.%d (%s): %s exception in kernel mode" 767 " (tf=%p, dear=%#lx, esr=%#x," 768 " srr0/1=%#lx/%#lx)", 769 __func__, p->p_pid, l->l_lid, p->p_comm, 770 trap_names[trap_code], tf, tf->tf_dear, 771 tf->tf_esr, tf->tf_srr0, tf->tf_srr1); 772 } 773 } 774 #if 0 775 if (tf->tf_fixreg[1] >= (register_t)l->l_addr + USPACE 776 || tf->tf_fixreg[1] < (register_t)l->l_addr + PAGE_SIZE) { 777 printf("%s(exit): pid %d.%d (%s): invalid kern sp %#lx\n", 778 __func__, p->p_pid, l->l_lid, p->p_comm, 779 tf->tf_fixreg[1]); 780 dump_trapframe(tf); 781 Debugger(); 782 } 783 #endif 784 #if 0 785 if ((mfmsr() & PSL_CE) == 0) { 786 printf("%s(exit): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 787 __func__, p->p_pid, l->l_lid, p->p_comm, 788 trap_names[trap_code], mfmsr()); 789 mtmsr(mfmsr()|PSL_CE); 790 dump_trapframe(tf); 791 } 792 #endif 793 } else { 794 if (rv == ENOMEM) { 795 printf("UVM: pid %d.%d (%s), uid %d killed: " 796 "out of swap\n", 797 p->p_pid, l->l_lid, p->p_comm, 798 l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1); 799 ksi.ksi_signo = SIGKILL; 800 } 801 if (rv != 0) { 802 if (cpu_printfataltraps) { 803 printf("%s: pid %d.%d (%s):" 804 " %s exception in user mode\n", 805 __func__, p->p_pid, l->l_lid, p->p_comm, 806 trap_names[trap_code]); 807 if (cpu_printfataltraps > 1) 808 dump_trapframe(tf); 809 } 810 (*p->p_emul->e_trapsignal)(l, &ksi); 811 } 812 #ifdef DEBUG 813 if ((tf->tf_srr1 & (PSL_DS|PSL_IS)) != (PSL_DS|PSL_IS)) { 814 printf("%s(exit): pid %d.%d (%s): %s invalid PSL %#lx\n", 815 __func__, p->p_pid, l->l_lid, p->p_comm, 816 trap_names[trap_code], tf->tf_srr1); 817 dump_trapframe(tf); 818 Debugger(); 819 } 820 #endif 821 #if 0 822 if ((mfmsr() & PSL_CE) == 0) { 823 printf("%s(exit): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 824 __func__, p->p_pid, l->l_lid, p->p_comm, 825 trap_names[trap_code], mfmsr()); 826 dump_trapframe(tf); 827 } 828 #endif 829 userret(l, tf); 830 } 831 } 832 833 void 834 upcallret(struct lwp *l) 835 { 836 837 mi_userret(l); /* Invoke MI userret code */ 838 } 839 840 /* 841 * Start a new LWP 842 */ 843 void 844 startlwp(void *arg) 845 { 846 ucontext_t * const uc = arg; 847 struct lwp * const l = curlwp; 848 849 int error = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); 850 KASSERT(error); 851 (void)error; 852 pool_put(&lwp_uc_pool, uc); 853 upcallret(l); 854 } 855
Indexes created Tue Oct 14 21:09:58 GMT 2025