trap.c revision 1.33
1 /* $NetBSD: trap.c,v 1.33 2020/07/15 07:44:34 rin 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 <sys/cdefs.h> 38 __KERNEL_RCSID(1, "$NetBSD: trap.c,v 1.33 2020/07/15 07:44:34 rin Exp $"); 39 40 #ifdef _KERNEL_OPT 41 #include "opt_altivec.h" 42 #include "opt_ddb.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/siginfo.h> 48 #include <sys/lwp.h> 49 #include <sys/proc.h> 50 #include <sys/cpu.h> 51 #include <sys/kauth.h> 52 #include <sys/ras.h> 53 54 #include <uvm/uvm_extern.h> 55 56 #include <powerpc/pcb.h> 57 #include <powerpc/userret.h> 58 #include <powerpc/psl.h> 59 #include <powerpc/instr.h> 60 #include <powerpc/altivec.h> /* use same interface for SPE */ 61 62 #include <powerpc/spr.h> 63 #include <powerpc/booke/spr.h> 64 #include <powerpc/booke/cpuvar.h> 65 66 #include <powerpc/fpu/fpu_extern.h> 67 68 #include <powerpc/db_machdep.h> 69 #include <ddb/db_interface.h> 70 71 #include <powerpc/trap.h> 72 #include <powerpc/booke/trap.h> 73 #include <powerpc/booke/pte.h> 74 75 void trap(enum ppc_booke_exceptions, struct trapframe *); 76 77 static const char trap_names[][8] = { 78 [T_CRITIAL_INPUT] = "CRIT", 79 [T_EXTERNAL_INPUT] = "EXT", 80 [T_DECREMENTER] = "DECR", 81 [T_FIXED_INTERVAL] = "FIT", 82 [T_WATCHDOG] = "WDOG", 83 [T_SYSTEM_CALL] = "SC", 84 [T_MACHINE_CHECK] = "MCHK", 85 [T_DSI] = "DSI", 86 [T_ISI] = "ISI", 87 [T_ALIGNMENT] = "ALN", 88 [T_PROGRAM] = "PGM", 89 [T_FP_UNAVAILABLE] = "FP", 90 [T_AP_UNAVAILABLE] = "AP", 91 [T_DATA_TLB_ERROR] = "DTLB", 92 [T_INSTRUCTION_TLB_ERROR] = "ITLB", 93 [T_DEBUG] = "DEBUG", 94 [T_SPE_UNAVAILABLE] = "SPE", 95 [T_EMBEDDED_FP_DATA] = "FPDATA", 96 [T_EMBEDDED_FP_ROUND] = "FPROUND", 97 [T_EMBEDDED_PERF_MONITOR] = "PERFMON", 98 [T_AST] = "AST", 99 }; 100 101 static inline bool 102 usertrap_p(struct trapframe *tf) 103 { 104 return (tf->tf_srr1 & PSL_PR) != 0; 105 } 106 107 static int 108 mchk_exception(struct trapframe *tf, ksiginfo_t *ksi) 109 { 110 const bool usertrap = usertrap_p(tf); 111 const vaddr_t faultva = tf->tf_mcar; 112 struct cpu_info * const ci = curcpu(); 113 int rv = EFAULT; 114 115 if (usertrap) { 116 ci->ci_ev_umchk.ev_count++; 117 KSI_INIT_TRAP(ksi); 118 ksi->ksi_signo = SIGBUS; 119 ksi->ksi_trap = EXC_MCHK; 120 ksi->ksi_addr = (void *)faultva; 121 ksi->ksi_code = BUS_OBJERR; 122 } 123 124 return rv; 125 } 126 127 static inline vm_prot_t 128 get_faulttype(const struct trapframe * const tf) 129 { 130 return VM_PROT_READ | (tf->tf_esr & ESR_ST ? VM_PROT_WRITE : 0); 131 } 132 133 static inline struct vm_map * 134 get_faultmap(const struct trapframe * const tf, register_t psl_mask) 135 { 136 return (tf->tf_srr1 & psl_mask) 137 ? &curlwp->l_proc->p_vmspace->vm_map 138 : kernel_map; 139 } 140 141 /* 142 * We could use pmap_pte_lookup but this slightly faster since we already 143 * the segtab pointers in cpu_info. 144 */ 145 static inline pt_entry_t * 146 trap_pte_lookup(struct trapframe *tf, vaddr_t va, register_t psl_mask) 147 { 148 pmap_segtab_t ** const stps = &curcpu()->ci_pmap_kern_segtab; 149 pmap_segtab_t * const stp = stps[(tf->tf_srr1 / psl_mask) & 1]; 150 if (__predict_false(stp == NULL)) 151 return NULL; 152 pt_entry_t * const ptep = stp->seg_tab[va >> SEGSHIFT]; 153 if (__predict_false(ptep == NULL)) 154 return NULL; 155 return ptep + ((va & SEGOFSET) >> PAGE_SHIFT); 156 } 157 158 static int 159 pagefault(struct vm_map *map, vaddr_t va, vm_prot_t ftype, bool usertrap) 160 { 161 struct lwp * const l = curlwp; 162 int rv; 163 164 // printf("%s(%p,%#lx,%u,%u)\n", __func__, map, va, ftype, usertrap); 165 166 if (usertrap) { 167 rv = uvm_fault(map, trunc_page(va), ftype); 168 if (rv == 0) 169 uvm_grow(l->l_proc, trunc_page(va)); 170 } else { 171 if (cpu_intr_p()) 172 return EFAULT; 173 174 struct pcb * const pcb = lwp_getpcb(l); 175 struct faultbuf * const fb = pcb->pcb_onfault; 176 pcb->pcb_onfault = NULL; 177 rv = uvm_fault(map, trunc_page(va), ftype); 178 pcb->pcb_onfault = fb; 179 if (map != kernel_map) { 180 if (rv == 0) 181 uvm_grow(l->l_proc, trunc_page(va)); 182 } 183 } 184 return rv; 185 } 186 187 static void 188 vm_signal(int error, int trap, vaddr_t addr, ksiginfo_t *ksi) 189 { 190 191 KSI_INIT_TRAP(ksi); 192 switch (error) { 193 case EINVAL: 194 ksi->ksi_signo = SIGBUS; 195 ksi->ksi_code = BUS_ADRERR; 196 break; 197 case EACCES: 198 ksi->ksi_signo = SIGSEGV; 199 ksi->ksi_code = SEGV_ACCERR; 200 break; 201 default: 202 ksi->ksi_signo = SIGSEGV; 203 ksi->ksi_code = SEGV_MAPERR; 204 break; 205 } 206 ksi->ksi_trap = trap; 207 ksi->ksi_addr = (void *)addr; 208 } 209 210 static int 211 dsi_exception(struct trapframe *tf, ksiginfo_t *ksi) 212 { 213 const vaddr_t faultva = tf->tf_dear; 214 const vm_prot_t ftype = get_faulttype(tf); 215 struct vm_map * const faultmap = get_faultmap(tf, PSL_DS); 216 const bool usertrap = usertrap_p(tf); 217 218 kpreempt_disable(); 219 struct cpu_info * const ci = curcpu(); 220 221 if (usertrap) 222 ci->ci_ev_udsi.ev_count++; 223 else 224 ci->ci_ev_kdsi.ev_count++; 225 226 /* 227 * If we had a TLB entry (which we must have had to get this exception), 228 * we certainly have a PTE. 229 */ 230 pt_entry_t * const ptep = trap_pte_lookup(tf, trunc_page(faultva), 231 PSL_DS); 232 KASSERT(ptep != NULL); 233 pt_entry_t pte = *ptep; 234 235 if ((ftype & VM_PROT_WRITE) 236 && ((pte & (PTE_xW|PTE_UNMODIFIED)) == (PTE_xW|PTE_UNMODIFIED))) { 237 const paddr_t pa = pte_to_paddr(pte); 238 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 239 KASSERT(pg); 240 struct vm_page_md * const mdpg = VM_PAGE_TO_MD(pg); 241 242 if (!VM_PAGEMD_MODIFIED_P(mdpg)) { 243 pmap_page_set_attributes(mdpg, VM_PAGEMD_MODIFIED); 244 } 245 pte &= ~PTE_UNMODIFIED; 246 *ptep = pte; 247 pmap_tlb_update_addr(faultmap->pmap, trunc_page(faultva), 248 pte, 0); 249 kpreempt_enable(); 250 return 0; 251 } 252 kpreempt_enable(); 253 254 int rv = pagefault(faultmap, faultva, ftype, usertrap); 255 256 if (__predict_false(rv != 0 && usertrap)) { 257 ci->ci_ev_udsi_fatal.ev_count++; 258 vm_signal(rv, EXC_DSI, faultva, ksi); 259 } 260 return rv; 261 } 262 263 static int 264 isi_exception(struct trapframe *tf, ksiginfo_t *ksi) 265 { 266 const vaddr_t faultva = trunc_page(tf->tf_srr0); 267 struct vm_map * const faultmap = get_faultmap(tf, PSL_IS); 268 const bool usertrap = usertrap_p(tf); 269 270 kpreempt_disable(); 271 struct cpu_info * const ci = curcpu(); 272 273 if (usertrap) 274 ci->ci_ev_isi.ev_count++; 275 else 276 ci->ci_ev_kisi.ev_count++; 277 278 /* 279 * If we had a TLB entry (which we must have had to get this exception), 280 * we certainly have a PTE. 281 */ 282 pt_entry_t * const ptep = trap_pte_lookup(tf, trunc_page(faultva), 283 PSL_IS); 284 if (ptep == NULL) 285 dump_trapframe(tf, NULL); 286 KASSERT(ptep != NULL); 287 pt_entry_t pte = *ptep; 288 289 UVMHIST_FUNC(__func__); UVMHIST_CALLED(pmapexechist); 290 291 if ((pte & PTE_UNSYNCED) == PTE_UNSYNCED) { 292 const paddr_t pa = pte_to_paddr(pte); 293 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 294 KASSERT(pg); 295 struct vm_page_md * const mdpg = VM_PAGE_TO_MD(pg); 296 297 UVMHIST_LOG(pmapexechist, 298 "srr0=%#x pg=%p (pa %#"PRIxPADDR"): %s", 299 tf->tf_srr0, pg, pa, 300 (VM_PAGEMD_EXECPAGE_P(mdpg) 301 ? "no syncicache (already execpage)" 302 : "performed syncicache (now execpage)")); 303 304 if (!VM_PAGEMD_EXECPAGE_P(mdpg)) { 305 ci->ci_softc->cpu_ev_exec_trap_sync.ev_count++; 306 dcache_wb_page(pa); 307 icache_inv_page(pa); 308 pmap_page_set_attributes(mdpg, VM_PAGEMD_EXECPAGE); 309 } 310 pte &= ~PTE_UNSYNCED; 311 pte |= PTE_xX; 312 *ptep = pte; 313 314 pmap_tlb_update_addr(faultmap->pmap, trunc_page(faultva), 315 pte, 0); 316 kpreempt_enable(); 317 UVMHIST_LOG(pmapexechist, "<- 0", 0,0,0,0); 318 return 0; 319 } 320 kpreempt_enable(); 321 322 int rv = pagefault(faultmap, faultva, VM_PROT_READ|VM_PROT_EXECUTE, 323 usertrap); 324 325 if (__predict_false(rv != 0 && usertrap)) { 326 ci->ci_ev_isi_fatal.ev_count++; 327 vm_signal(rv, EXC_ISI, tf->tf_srr0, ksi); 328 } 329 UVMHIST_LOG(pmapexechist, "<- %d", rv, 0,0,0); 330 return rv; 331 } 332 333 static int 334 dtlb_exception(struct trapframe *tf, ksiginfo_t *ksi) 335 { 336 const vaddr_t faultva = tf->tf_dear; 337 const vm_prot_t ftype = get_faulttype(tf); 338 struct vm_map * const faultmap = get_faultmap(tf, PSL_DS); 339 struct cpu_info * const ci = curcpu(); 340 const bool usertrap = usertrap_p(tf); 341 342 #if 0 343 /* 344 * This is what pte_load in trap_subr.S does for us. 345 */ 346 const pt_entry_t * const ptep = 347 trap_pte_lookup(tf, trunc_page(faultva), PSL_DS); 348 if (ptep != NULL && !usertrap && pte_valid_p(*ptep)) { 349 tlb_update_addr(trunc_page(faultva), KERNEL_PID, *ptep, true); 350 ci->ci_ev_tlbmiss_soft.ev_count++; 351 return 0; 352 } 353 #endif 354 355 ci->ci_ev_dtlbmiss_hard.ev_count++; 356 357 // printf("pagefault(%p,%#lx,%u,%u)", faultmap, faultva, ftype, usertrap); 358 int rv = pagefault(faultmap, faultva, ftype, usertrap); 359 // printf(": %d\n", rv); 360 361 if (__predict_false(rv != 0 && usertrap)) { 362 ci->ci_ev_udsi_fatal.ev_count++; 363 vm_signal(rv, EXC_DSI, faultva, ksi); 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 vm_signal(rv, EXC_ISI, tf->tf_srr0, ksi); 384 } 385 return rv; 386 } 387 388 static int 389 spe_exception(struct trapframe *tf, ksiginfo_t *ksi) 390 { 391 struct cpu_info * const ci = curcpu(); 392 393 if (!usertrap_p(tf)) 394 return EPERM; 395 396 ci->ci_ev_vec.ev_count++; 397 398 #ifdef PPC_HAVE_SPE 399 vec_load(); 400 return 0; 401 #else 402 KSI_INIT_TRAP(ksi); 403 ksi->ksi_signo = SIGILL; 404 ksi->ksi_trap = EXC_PGM; 405 ksi->ksi_code = ILL_ILLOPC; 406 ksi->ksi_addr = (void *)tf->tf_srr0; 407 return EPERM; 408 #endif 409 } 410 411 static bool 412 emulate_opcode(struct trapframe *tf, ksiginfo_t *ksi) 413 { 414 uint32_t opcode; 415 if (copyin((void *)tf->tf_srr0, &opcode, sizeof(opcode)) != 0) 416 return false; 417 418 if (opcode == OPC_LWSYNC) 419 return true; 420 421 if (OPC_MFSPR_P(opcode, SPR_PVR)) { 422 __asm ("mfpvr %0" : "=r"(tf->tf_fixreg[OPC_MFSPR_REG(opcode)])); 423 return true; 424 } 425 426 if (OPC_MFSPR_P(opcode, SPR_PIR)) { 427 __asm ("mfspr %0, %1" 428 : "=r"(tf->tf_fixreg[OPC_MFSPR_REG(opcode)]) 429 : "n"(SPR_PIR)); 430 return true; 431 } 432 433 if (OPC_MFSPR_P(opcode, SPR_SVR)) { 434 __asm ("mfspr %0,%1" 435 : "=r"(tf->tf_fixreg[OPC_MFSPR_REG(opcode)]) 436 : "n"(SPR_SVR)); 437 return true; 438 } 439 440 /* 441 * If we bothered to emulate FP, we would try to do so here. 442 */ 443 return false; 444 } 445 446 static int 447 pgm_exception(struct trapframe *tf, ksiginfo_t *ksi) 448 { 449 struct cpu_info * const ci = curcpu(); 450 int rv = EPERM; 451 452 if (!usertrap_p(tf)) 453 return rv; 454 455 UVMHIST_FUNC(__func__); UVMHIST_CALLED(pmapexechist); 456 457 UVMHIST_LOG(pmapexechist, " srr0/1=%#x/%#x esr=%#x pte=%#x", 458 tf->tf_srr0, tf->tf_srr1, tf->tf_esr, 459 *trap_pte_lookup(tf, trunc_page(tf->tf_srr0), PSL_IS)); 460 461 ci->ci_ev_pgm.ev_count++; 462 463 if (tf->tf_esr & ESR_PTR) { 464 struct proc *p = curlwp->l_proc; 465 if (p->p_raslist != NULL 466 && ras_lookup(p, (void *)tf->tf_srr0) != (void *) -1) { 467 tf->tf_srr0 += 4; 468 return 0; 469 } 470 } 471 472 if (tf->tf_esr & (ESR_PIL|ESR_PPR)) { 473 if (emulate_opcode(tf, ksi)) { 474 tf->tf_srr0 += 4; 475 return 0; 476 } 477 } 478 479 if (tf->tf_esr & ESR_PIL) { 480 struct lwp * const l = curlwp; 481 struct pcb * const pcb = lwp_getpcb(l); 482 483 if (__predict_false(!fpu_used_p(l))) { 484 memset(&pcb->pcb_fpu, 0, sizeof(pcb->pcb_fpu)); 485 fpu_mark_used(l); 486 } 487 if (fpu_emulate(tf, &pcb->pcb_fpu, ksi)) { 488 if (ksi->ksi_signo == 0) { 489 ci->ci_ev_fpu.ev_count++; 490 return 0; 491 } 492 return EFAULT; 493 } 494 } 495 496 KSI_INIT_TRAP(ksi); 497 ksi->ksi_signo = SIGILL; 498 ksi->ksi_trap = EXC_PGM; 499 if (tf->tf_esr & ESR_PIL) { 500 ksi->ksi_code = ILL_ILLOPC; 501 } else if (tf->tf_esr & ESR_PPR) { 502 ksi->ksi_code = ILL_PRVOPC; 503 } else if (tf->tf_esr & ESR_PTR) { 504 ksi->ksi_signo = SIGTRAP; 505 ksi->ksi_code = TRAP_BRKPT; 506 } else { 507 ksi->ksi_code = 0; 508 } 509 ksi->ksi_addr = (void *)tf->tf_srr0; 510 return rv; 511 } 512 513 static int 514 debug_exception(struct trapframe *tf, ksiginfo_t *ksi) 515 { 516 struct cpu_info * const ci = curcpu(); 517 int rv = EPERM; 518 519 if (!usertrap_p(tf)) 520 return rv; 521 522 ci->ci_ev_debug.ev_count++; 523 524 /* 525 * Ack the interrupt. 526 */ 527 mtspr(SPR_DBSR, tf->tf_esr); 528 KASSERT(tf->tf_esr & (DBSR_IAC1|DBSR_IAC2|DBSR_BRT)); 529 KASSERT((tf->tf_srr1 & PSL_SE) == 0); 530 531 /* 532 * Disable debug events 533 */ 534 mtspr(SPR_DBCR1, 0); 535 mtspr(SPR_DBCR0, 0); 536 537 /* 538 * Tell the debugger ... 539 */ 540 KSI_INIT_TRAP(ksi); 541 ksi->ksi_signo = SIGTRAP; 542 ksi->ksi_trap = EXC_TRC; 543 ksi->ksi_addr = (void *)tf->tf_srr0; 544 ksi->ksi_code = TRAP_TRACE; 545 return rv; 546 } 547 548 static int 549 ali_exception(struct trapframe *tf, ksiginfo_t *ksi) 550 { 551 struct cpu_info * const ci = curcpu(); 552 int rv = EFAULT; 553 554 ci->ci_ev_ali.ev_count++; 555 556 if (rv != 0 && usertrap_p(tf)) { 557 ci->ci_ev_ali_fatal.ev_count++; 558 KSI_INIT_TRAP(ksi); 559 ksi->ksi_signo = SIGILL; 560 ksi->ksi_trap = EXC_PGM; 561 if (tf->tf_esr & ESR_PIL) 562 ksi->ksi_code = ILL_ILLOPC; 563 else if (tf->tf_esr & ESR_PPR) 564 ksi->ksi_code = ILL_PRVOPC; 565 else if (tf->tf_esr & ESR_PTR) 566 ksi->ksi_code = ILL_ILLTRP; 567 else 568 ksi->ksi_code = 0; 569 ksi->ksi_addr = (void *)tf->tf_srr0; 570 } 571 return rv; 572 } 573 574 static int 575 embedded_fp_data_exception(struct trapframe *tf, ksiginfo_t *ksi) 576 { 577 struct cpu_info * const ci = curcpu(); 578 int rv = EFAULT; 579 580 ci->ci_ev_fpu.ev_count++; 581 582 if (rv != 0 && usertrap_p(tf)) { 583 KSI_INIT_TRAP(ksi); 584 #ifdef PPC_HAVE_SPE 585 ksi->ksi_signo = SIGFPE; 586 ksi->ksi_trap = tf->tf_exc; 587 ksi->ksi_code = vec_siginfo_code(tf); 588 #else 589 ksi->ksi_signo = SIGILL; 590 ksi->ksi_trap = EXC_PGM; 591 ksi->ksi_code = ILL_ILLOPC; 592 #endif 593 ksi->ksi_addr = (void *)tf->tf_srr0; 594 } 595 return rv; 596 } 597 598 static int 599 embedded_fp_round_exception(struct trapframe *tf, ksiginfo_t *ksi) 600 { 601 struct cpu_info * const ci = curcpu(); 602 int rv = EDOM; 603 604 ci->ci_ev_fpu.ev_count++; 605 606 if (rv != 0 && usertrap_p(tf)) { 607 KSI_INIT_TRAP(ksi); 608 #ifdef PPC_HAVE_SPE 609 ksi->ksi_signo = SIGFPE; 610 ksi->ksi_trap = tf->tf_exc; 611 ksi->ksi_code = vec_siginfo_code(tf); 612 #else 613 ksi->ksi_signo = SIGILL; 614 ksi->ksi_trap = EXC_PGM; 615 ksi->ksi_code = ILL_ILLOPC; 616 #endif 617 ksi->ksi_addr = (void *)tf->tf_srr0; 618 } 619 return rv; 620 } 621 622 void 623 dump_trapframe(const struct trapframe *tf, void (*pr)(const char *, ...)) 624 { 625 if (pr == NULL) 626 pr = printf; 627 (*pr)("trapframe %p (exc=%x srr0/1=%#lx/%#lx esr/dear=%#x/%#lx)\n", 628 tf, tf->tf_exc, tf->tf_srr0, tf->tf_srr1, tf->tf_esr, tf->tf_dear); 629 (*pr)("lr =%08lx ctr=%08lx cr =%08x xer=%08x\n", 630 tf->tf_lr, tf->tf_ctr, tf->tf_cr, tf->tf_xer); 631 for (u_int r = 0; r < 32; r += 4) { 632 (*pr)("r%02u=%08lx r%02u=%08lx r%02u=%08lx r%02u=%08lx\n", 633 r+0, tf->tf_fixreg[r+0], r+1, tf->tf_fixreg[r+1], 634 r+2, tf->tf_fixreg[r+2], r+3, tf->tf_fixreg[r+3]); 635 } 636 } 637 638 static bool 639 ddb_exception(struct trapframe *tf) 640 { 641 #if 0 642 const register_t ddb_trapfunc = (uintptr_t) cpu_Debugger; 643 if ((tf->tf_esr & ESR_PTR) == 0) 644 return false; 645 if (ddb_trapfunc <= tf->tf_srr0 && tf->tf_srr0 <= ddb_trapfunc+16) { 646 register_t srr0 = tf->tf_srr0; 647 if (kdb_trap(tf->tf_exc, tf)) { 648 if (srr0 == tf->tf_srr0) 649 tf->tf_srr0 += 4; 650 return true; 651 } 652 } 653 return false; 654 #else 655 #if 0 656 struct cpu_info * const ci = curcpu(); 657 struct cpu_softc * const cpu = ci->ci_softc; 658 printf("CPL stack:"); 659 if (ci->ci_idepth >= 0) { 660 for (u_int i = 0; i <= ci->ci_idepth; i++) { 661 printf(" [%u]=%u", i, cpu->cpu_pcpls[i]); 662 } 663 } 664 printf(" %u\n", ci->ci_cpl); 665 dump_trapframe(tf, NULL); 666 #endif 667 if (kdb_trap(tf->tf_exc, tf)) { 668 tf->tf_srr0 += 4; 669 return true; 670 } 671 return false; 672 #endif 673 } 674 675 static bool 676 onfaulted(struct trapframe *tf, register_t rv) 677 { 678 struct lwp * const l = curlwp; 679 struct pcb * const pcb = lwp_getpcb(l); 680 struct faultbuf * const fb = pcb->pcb_onfault; 681 if (fb == NULL) 682 return false; 683 tf->tf_srr0 = fb->fb_pc; 684 tf->tf_srr1 = fb->fb_msr; 685 tf->tf_cr = fb->fb_cr; 686 tf->tf_fixreg[1] = fb->fb_sp; 687 tf->tf_fixreg[2] = fb->fb_r2; 688 tf->tf_fixreg[3] = rv; 689 memcpy(&tf->tf_fixreg[13], fb->fb_fixreg, sizeof(fb->fb_fixreg)); 690 return true; 691 } 692 693 void 694 trap(enum ppc_booke_exceptions trap_code, struct trapframe *tf) 695 { 696 const bool usertrap = usertrap_p(tf); 697 struct cpu_info * const ci = curcpu(); 698 struct lwp * const l = curlwp; 699 struct proc * const p = l->l_proc; 700 ksiginfo_t ksi; 701 int rv = EACCES; 702 703 ci->ci_ev_traps.ev_count++; 704 ci->ci_data.cpu_ntrap++; 705 706 KASSERTMSG(!usertrap || tf == trapframe(l), 707 "trap: tf=%p is invalid: trapframe(%p)=%p", tf, l, trapframe(l)); 708 709 #if 0 710 if (trap_code != T_PROGRAM || usertrap) 711 printf("trap(enter): %s (tf=%p, esr/dear=%#x/%#lx, srr0/1=%#lx/%#lx, lr=%#lx)\n", 712 trap_names[trap_code], tf, tf->tf_esr, tf->tf_dear, 713 tf->tf_srr0, tf->tf_srr1, tf->tf_lr); 714 #endif 715 #if 0 716 if ((register_t)tf >= (register_t)l->l_addr + USPACE 717 || (register_t)tf < (register_t)l->l_addr + PAGE_SIZE) { 718 printf("%s(entry): pid %d.%d (%s): invalid tf addr %p\n", 719 __func__, p->p_pid, l->l_lid, p->p_comm, tf); 720 dump_trapframe(tf, NULL); 721 Debugger(); 722 } 723 #endif 724 #if 0 725 if ((mfmsr() & PSL_CE) == 0) { 726 printf("%s(entry): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 727 __func__, p->p_pid, l->l_lid, p->p_comm, 728 trap_names[trap_code], mfmsr()); 729 dump_trapframe(tf, NULL); 730 } 731 #endif 732 733 if ((VM_MAX_ADDRESS & 0x80000000) == 0 734 && usertrap && (tf->tf_fixreg[1] & 0x80000000)) { 735 printf("%s(entry): pid %d.%d (%s): %s invalid sp %#lx " 736 "(sprg1=%#jx)\n", __func__, p->p_pid, l->l_lid, p->p_comm, 737 trap_names[trap_code], tf->tf_fixreg[1], 738 (uintmax_t)mfspr(SPR_SPRG1)); 739 dump_trapframe(tf, NULL); 740 Debugger(); 741 } 742 743 if (usertrap && (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, NULL); 748 Debugger(); 749 } 750 751 switch (trap_code) { 752 case T_CRITIAL_INPUT: 753 case T_EXTERNAL_INPUT: 754 case T_DECREMENTER: 755 case T_FIXED_INTERVAL: 756 case T_WATCHDOG: 757 case T_SYSTEM_CALL: 758 default: 759 panic("trap: unexcepted trap code %d! (tf=%p, srr0/1=%#lx/%#lx)", 760 trap_code, tf, tf->tf_srr0, tf->tf_srr1); 761 case T_MACHINE_CHECK: 762 rv = mchk_exception(tf, &ksi); 763 break; 764 case T_DSI: 765 rv = dsi_exception(tf, &ksi); 766 break; 767 case T_ISI: 768 rv = isi_exception(tf, &ksi); 769 break; 770 case T_ALIGNMENT: 771 rv = ali_exception(tf, &ksi); 772 break; 773 case T_SPE_UNAVAILABLE: 774 rv = spe_exception(tf, &ksi); 775 break; 776 case T_PROGRAM: 777 #ifdef DDB 778 if (!usertrap && ddb_exception(tf)) 779 return; 780 #endif 781 rv = pgm_exception(tf, &ksi); 782 break; 783 case T_FP_UNAVAILABLE: 784 case T_AP_UNAVAILABLE: 785 panic("trap: unexcepted trap code %d! (tf=%p, srr0/1=%#lx/%#lx)", 786 trap_code, tf, tf->tf_srr0, tf->tf_srr1); 787 case T_DATA_TLB_ERROR: 788 rv = dtlb_exception(tf, &ksi); 789 break; 790 case T_INSTRUCTION_TLB_ERROR: 791 rv = itlb_exception(tf, &ksi); 792 break; 793 case T_DEBUG: 794 #ifdef DDB 795 if (!usertrap && ddb_exception(tf)) 796 return; 797 #endif 798 rv = debug_exception(tf, &ksi); 799 break; 800 case T_EMBEDDED_FP_DATA: 801 rv = embedded_fp_data_exception(tf, &ksi); 802 break; 803 case T_EMBEDDED_FP_ROUND: 804 rv = embedded_fp_round_exception(tf, &ksi); 805 break; 806 case T_EMBEDDED_PERF_MONITOR: 807 //db_stack_trace_print(tf->tf_fixreg[1], true, 40, "", printf); 808 dump_trapframe(tf, NULL); 809 rv = EPERM; 810 break; 811 case T_AST: 812 KASSERT(usertrap); 813 cpu_ast(l, ci); 814 if ((VM_MAX_ADDRESS & 0x80000000) == 0 815 && (tf->tf_fixreg[1] & 0x80000000)) { 816 printf("%s(ast-exit): pid %d.%d (%s): invalid sp %#lx\n", 817 __func__, p->p_pid, l->l_lid, p->p_comm, 818 tf->tf_fixreg[1]); 819 dump_trapframe(tf, NULL); 820 Debugger(); 821 } 822 if ((tf->tf_srr1 & (PSL_DS|PSL_IS)) != (PSL_DS|PSL_IS)) { 823 printf("%s(entry): pid %d.%d (%s): %s invalid PSL %#lx\n", 824 __func__, p->p_pid, l->l_lid, p->p_comm, 825 trap_names[trap_code], tf->tf_srr1); 826 dump_trapframe(tf, NULL); 827 Debugger(); 828 } 829 #if 0 830 if ((mfmsr() & PSL_CE) == 0) { 831 printf("%s(exit): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 832 __func__, p->p_pid, l->l_lid, p->p_comm, 833 trap_names[trap_code], mfmsr()); 834 dump_trapframe(tf, NULL); 835 } 836 #endif 837 userret(l, tf); 838 return; 839 } 840 if (!usertrap) { 841 if (rv != 0) { 842 if (!onfaulted(tf, rv)) { 843 db_stack_trace_print(tf->tf_fixreg[1], true, 40, "", printf); 844 dump_trapframe(tf, NULL); 845 panic("%s: pid %d.%d (%s): %s exception in kernel mode" 846 " (tf=%p, dear=%#lx, esr=%#x," 847 " srr0/1=%#lx/%#lx)", 848 __func__, p->p_pid, l->l_lid, p->p_comm, 849 trap_names[trap_code], tf, tf->tf_dear, 850 tf->tf_esr, tf->tf_srr0, tf->tf_srr1); 851 } 852 } 853 #if 0 854 if (tf->tf_fixreg[1] >= (register_t)l->l_addr + USPACE 855 || tf->tf_fixreg[1] < (register_t)l->l_addr + PAGE_SIZE) { 856 printf("%s(exit): pid %d.%d (%s): invalid kern sp %#lx\n", 857 __func__, p->p_pid, l->l_lid, p->p_comm, 858 tf->tf_fixreg[1]); 859 dump_trapframe(tf, NULL); 860 Debugger(); 861 } 862 #endif 863 #if 0 864 if ((mfmsr() & PSL_CE) == 0) { 865 printf("%s(exit): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 866 __func__, p->p_pid, l->l_lid, p->p_comm, 867 trap_names[trap_code], mfmsr()); 868 mtmsr(mfmsr()|PSL_CE); 869 dump_trapframe(tf, NULL); 870 } 871 #endif 872 } else { 873 if (rv == ENOMEM) { 874 printf("UVM: pid %d.%d (%s), uid %d killed: " 875 "out of swap\n", 876 p->p_pid, l->l_lid, p->p_comm, 877 l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1); 878 ksi.ksi_signo = SIGKILL; 879 ksi.ksi_code = 0; 880 } 881 if (rv != 0) { 882 /* 883 * Only print a fatal trap if the signal will be 884 * uncaught. 885 */ 886 if (cpu_printfataltraps 887 && (p->p_slflag & PSL_TRACED) == 0 888 && !sigismember(&p->p_sigctx.ps_sigcatch, 889 ksi.ksi_signo)) { 890 printf("%s: pid %d.%d (%s):" 891 " %s exception in user mode\n", 892 __func__, p->p_pid, l->l_lid, p->p_comm, 893 trap_names[trap_code]); 894 if (cpu_printfataltraps > 1) 895 dump_trapframe(tf, NULL); 896 } 897 (*p->p_emul->e_trapsignal)(l, &ksi); 898 } 899 #ifdef DEBUG 900 if ((tf->tf_srr1 & (PSL_DS|PSL_IS)) != (PSL_DS|PSL_IS)) { 901 printf("%s(exit): pid %d.%d (%s): %s invalid PSL %#lx\n", 902 __func__, p->p_pid, l->l_lid, p->p_comm, 903 trap_names[trap_code], tf->tf_srr1); 904 dump_trapframe(tf, NULL); 905 Debugger(); 906 } 907 #endif 908 #if 0 909 if ((mfmsr() & PSL_CE) == 0) { 910 printf("%s(exit): pid %d.%d (%s): %s: PSL_CE (%#lx) not set\n", 911 __func__, p->p_pid, l->l_lid, p->p_comm, 912 trap_names[trap_code], mfmsr()); 913 dump_trapframe(tf, NULL); 914 } 915 #endif 916 userret(l, tf); 917 } 918 } 919
Indexes created Mon Sep 29 21:09:56 GMT 2025