1 /* 2 * linux/arch/m68k/kernel/traps.c 3 * 4 * Copyright (C) 1993, 1994 by Hamish Macdonald 5 * 6 * 68040 fixes by Michael Rausch 7 * 68040 fixes by Martin Apel 8 * 68040 fixes and writeback by Richard Zidlicky 9 * 68060 fixes by Roman Hodek 10 * 68060 fixes by Jesper Skov 11 * 12 * This file is subject to the terms and conditions of the GNU General Public 13 * License. See the file COPYING in the main directory of this archive 14 * for more details. 15 */ 16 17 /* 18 * Sets up all exception vectors 19 */ 20 21 #include <linux/sched.h> 22 #include <linux/signal.h> 23 #include <linux/kernel.h> 24 #include <linux/mm.h> 25 #include <linux/module.h> 26 #include <linux/user.h> 27 #include <linux/string.h> 28 #include <linux/linkage.h> 29 #include <linux/init.h> 30 #include <linux/ptrace.h> 31 #include <linux/kallsyms.h> 32 33 #include <asm/setup.h> 34 #include <asm/fpu.h> 35 #include <asm/system.h> 36 #include <asm/uaccess.h> 37 #include <asm/traps.h> 38 #include <asm/pgalloc.h> 39 #include <asm/machdep.h> 40 #include <asm/siginfo.h> 41 42 43 static const char *vec_names[] = { 44 [VEC_RESETSP] = "RESET SP", 45 [VEC_RESETPC] = "RESET PC", 46 [VEC_BUSERR] = "BUS ERROR", 47 [VEC_ADDRERR] = "ADDRESS ERROR", 48 [VEC_ILLEGAL] = "ILLEGAL INSTRUCTION", 49 [VEC_ZERODIV] = "ZERO DIVIDE", 50 [VEC_CHK] = "CHK", 51 [VEC_TRAP] = "TRAPcc", 52 [VEC_PRIV] = "PRIVILEGE VIOLATION", 53 [VEC_TRACE] = "TRACE", 54 [VEC_LINE10] = "LINE 1010", 55 [VEC_LINE11] = "LINE 1111", 56 [VEC_RESV12] = "UNASSIGNED RESERVED 12", 57 [VEC_COPROC] = "COPROCESSOR PROTOCOL VIOLATION", 58 [VEC_FORMAT] = "FORMAT ERROR", 59 [VEC_UNINT] = "UNINITIALIZED INTERRUPT", 60 [VEC_RESV16] = "UNASSIGNED RESERVED 16", 61 [VEC_RESV17] = "UNASSIGNED RESERVED 17", 62 [VEC_RESV18] = "UNASSIGNED RESERVED 18", 63 [VEC_RESV19] = "UNASSIGNED RESERVED 19", 64 [VEC_RESV20] = "UNASSIGNED RESERVED 20", 65 [VEC_RESV21] = "UNASSIGNED RESERVED 21", 66 [VEC_RESV22] = "UNASSIGNED RESERVED 22", 67 [VEC_RESV23] = "UNASSIGNED RESERVED 23", 68 [VEC_SPUR] = "SPURIOUS INTERRUPT", 69 [VEC_INT1] = "LEVEL 1 INT", 70 [VEC_INT2] = "LEVEL 2 INT", 71 [VEC_INT3] = "LEVEL 3 INT", 72 [VEC_INT4] = "LEVEL 4 INT", 73 [VEC_INT5] = "LEVEL 5 INT", 74 [VEC_INT6] = "LEVEL 6 INT", 75 [VEC_INT7] = "LEVEL 7 INT", 76 [VEC_SYS] = "SYSCALL", 77 [VEC_TRAP1] = "TRAP #1", 78 [VEC_TRAP2] = "TRAP #2", 79 [VEC_TRAP3] = "TRAP #3", 80 [VEC_TRAP4] = "TRAP #4", 81 [VEC_TRAP5] = "TRAP #5", 82 [VEC_TRAP6] = "TRAP #6", 83 [VEC_TRAP7] = "TRAP #7", 84 [VEC_TRAP8] = "TRAP #8", 85 [VEC_TRAP9] = "TRAP #9", 86 [VEC_TRAP10] = "TRAP #10", 87 [VEC_TRAP11] = "TRAP #11", 88 [VEC_TRAP12] = "TRAP #12", 89 [VEC_TRAP13] = "TRAP #13", 90 [VEC_TRAP14] = "TRAP #14", 91 [VEC_TRAP15] = "TRAP #15", 92 [VEC_FPBRUC] = "FPCP BSUN", 93 [VEC_FPIR] = "FPCP INEXACT", 94 [VEC_FPDIVZ] = "FPCP DIV BY 0", 95 [VEC_FPUNDER] = "FPCP UNDERFLOW", 96 [VEC_FPOE] = "FPCP OPERAND ERROR", 97 [VEC_FPOVER] = "FPCP OVERFLOW", 98 [VEC_FPNAN] = "FPCP SNAN", 99 [VEC_FPUNSUP] = "FPCP UNSUPPORTED OPERATION", 100 [VEC_MMUCFG] = "MMU CONFIGURATION ERROR", 101 [VEC_MMUILL] = "MMU ILLEGAL OPERATION ERROR", 102 [VEC_MMUACC] = "MMU ACCESS LEVEL VIOLATION ERROR", 103 [VEC_RESV59] = "UNASSIGNED RESERVED 59", 104 [VEC_UNIMPEA] = "UNASSIGNED RESERVED 60", 105 [VEC_UNIMPII] = "UNASSIGNED RESERVED 61", 106 [VEC_RESV62] = "UNASSIGNED RESERVED 62", 107 [VEC_RESV63] = "UNASSIGNED RESERVED 63", 108 }; 109 110 static const char *space_names[] = { 111 [0] = "Space 0", 112 [USER_DATA] = "User Data", 113 [USER_PROGRAM] = "User Program", 114 #ifndef CONFIG_SUN3 115 [3] = "Space 3", 116 #else 117 [FC_CONTROL] = "Control", 118 #endif 119 [4] = "Space 4", 120 [SUPER_DATA] = "Super Data", 121 [SUPER_PROGRAM] = "Super Program", 122 [CPU_SPACE] = "CPU" 123 }; 124 125 void die_if_kernel(char *,struct pt_regs *,int); 126 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address, 127 unsigned long error_code); 128 int send_fault_sig(struct pt_regs *regs); 129 130 asmlinkage void trap_c(struct frame *fp); 131 132 #if defined (CONFIG_M68060) 133 static inline void access_error060 (struct frame *fp) 134 { 135 unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */ 136 137 #ifdef DEBUG 138 printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr); 139 #endif 140 141 if (fslw & MMU060_BPE) { 142 /* branch prediction error -> clear branch cache */ 143 __asm__ __volatile__ ("movec %/cacr,%/d0\n\t" 144 "orl #0x00400000,%/d0\n\t" 145 "movec %/d0,%/cacr" 146 : : : "d0" ); 147 /* return if there's no other error */ 148 if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE)) 149 return; 150 } 151 152 if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) { 153 unsigned long errorcode; 154 unsigned long addr = fp->un.fmt4.effaddr; 155 156 if (fslw & MMU060_MA) 157 addr = (addr + PAGE_SIZE - 1) & PAGE_MASK; 158 159 errorcode = 1; 160 if (fslw & MMU060_DESC_ERR) { 161 __flush_tlb040_one(addr); 162 errorcode = 0; 163 } 164 if (fslw & MMU060_W) 165 errorcode |= 2; 166 #ifdef DEBUG 167 printk("errorcode = %d\n", errorcode ); 168 #endif 169 do_page_fault(&fp->ptregs, addr, errorcode); 170 } else if (fslw & (MMU060_SEE)){ 171 /* Software Emulation Error. 172 * fault during mem_read/mem_write in ifpsp060/os.S 173 */ 174 send_fault_sig(&fp->ptregs); 175 } else if (!(fslw & (MMU060_RE|MMU060_WE)) || 176 send_fault_sig(&fp->ptregs) > 0) { 177 printk("pc=%#lx, fa=%#lx\n", fp->ptregs.pc, fp->un.fmt4.effaddr); 178 printk( "68060 access error, fslw=%lx\n", fslw ); 179 trap_c( fp ); 180 } 181 } 182 #endif /* CONFIG_M68060 */ 183 184 #if defined (CONFIG_M68040) 185 static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs) 186 { 187 unsigned long mmusr; 188 mm_segment_t old_fs = get_fs(); 189 190 set_fs(MAKE_MM_SEG(wbs)); 191 192 if (iswrite) 193 asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr)); 194 else 195 asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr)); 196 197 asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr)); 198 199 set_fs(old_fs); 200 201 return mmusr; 202 } 203 204 static inline int do_040writeback1(unsigned short wbs, unsigned long wba, 205 unsigned long wbd) 206 { 207 int res = 0; 208 mm_segment_t old_fs = get_fs(); 209 210 /* set_fs can not be moved, otherwise put_user() may oops */ 211 set_fs(MAKE_MM_SEG(wbs)); 212 213 switch (wbs & WBSIZ_040) { 214 case BA_SIZE_BYTE: 215 res = put_user(wbd & 0xff, (char __user *)wba); 216 break; 217 case BA_SIZE_WORD: 218 res = put_user(wbd & 0xffff, (short __user *)wba); 219 break; 220 case BA_SIZE_LONG: 221 res = put_user(wbd, (int __user *)wba); 222 break; 223 } 224 225 /* set_fs can not be moved, otherwise put_user() may oops */ 226 set_fs(old_fs); 227 228 229 #ifdef DEBUG 230 printk("do_040writeback1, res=%d\n",res); 231 #endif 232 233 return res; 234 } 235 236 /* after an exception in a writeback the stack frame corresponding 237 * to that exception is discarded, set a few bits in the old frame 238 * to simulate what it should look like 239 */ 240 static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs) 241 { 242 fp->un.fmt7.faddr = wba; 243 fp->un.fmt7.ssw = wbs & 0xff; 244 if (wba != current->thread.faddr) 245 fp->un.fmt7.ssw |= MA_040; 246 } 247 248 static inline void do_040writebacks(struct frame *fp) 249 { 250 int res = 0; 251 #if 0 252 if (fp->un.fmt7.wb1s & WBV_040) 253 printk("access_error040: cannot handle 1st writeback. oops.\n"); 254 #endif 255 256 if ((fp->un.fmt7.wb2s & WBV_040) && 257 !(fp->un.fmt7.wb2s & WBTT_040)) { 258 res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, 259 fp->un.fmt7.wb2d); 260 if (res) 261 fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s); 262 else 263 fp->un.fmt7.wb2s = 0; 264 } 265 266 /* do the 2nd wb only if the first one was successful (except for a kernel wb) */ 267 if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) { 268 res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, 269 fp->un.fmt7.wb3d); 270 if (res) 271 { 272 fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s); 273 274 fp->un.fmt7.wb2s = fp->un.fmt7.wb3s; 275 fp->un.fmt7.wb3s &= (~WBV_040); 276 fp->un.fmt7.wb2a = fp->un.fmt7.wb3a; 277 fp->un.fmt7.wb2d = fp->un.fmt7.wb3d; 278 } 279 else 280 fp->un.fmt7.wb3s = 0; 281 } 282 283 if (res) 284 send_fault_sig(&fp->ptregs); 285 } 286 287 /* 288 * called from sigreturn(), must ensure userspace code didn't 289 * manipulate exception frame to circumvent protection, then complete 290 * pending writebacks 291 * we just clear TM2 to turn it into a userspace access 292 */ 293 asmlinkage void berr_040cleanup(struct frame *fp) 294 { 295 fp->un.fmt7.wb2s &= ~4; 296 fp->un.fmt7.wb3s &= ~4; 297 298 do_040writebacks(fp); 299 } 300 301 static inline void access_error040(struct frame *fp) 302 { 303 unsigned short ssw = fp->un.fmt7.ssw; 304 unsigned long mmusr; 305 306 #ifdef DEBUG 307 printk("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr); 308 printk("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s, 309 fp->un.fmt7.wb2s, fp->un.fmt7.wb3s); 310 printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n", 311 fp->un.fmt7.wb2a, fp->un.fmt7.wb3a, 312 fp->un.fmt7.wb2d, fp->un.fmt7.wb3d); 313 #endif 314 315 if (ssw & ATC_040) { 316 unsigned long addr = fp->un.fmt7.faddr; 317 unsigned long errorcode; 318 319 /* 320 * The MMU status has to be determined AFTER the address 321 * has been corrected if there was a misaligned access (MA). 322 */ 323 if (ssw & MA_040) 324 addr = (addr + 7) & -8; 325 326 /* MMU error, get the MMUSR info for this access */ 327 mmusr = probe040(!(ssw & RW_040), addr, ssw); 328 #ifdef DEBUG 329 printk("mmusr = %lx\n", mmusr); 330 #endif 331 errorcode = 1; 332 if (!(mmusr & MMU_R_040)) { 333 /* clear the invalid atc entry */ 334 __flush_tlb040_one(addr); 335 errorcode = 0; 336 } 337 338 /* despite what documentation seems to say, RMW 339 * accesses have always both the LK and RW bits set */ 340 if (!(ssw & RW_040) || (ssw & LK_040)) 341 errorcode |= 2; 342 343 if (do_page_fault(&fp->ptregs, addr, errorcode)) { 344 #ifdef DEBUG 345 printk("do_page_fault() !=0\n"); 346 #endif 347 if (user_mode(&fp->ptregs)){ 348 /* delay writebacks after signal delivery */ 349 #ifdef DEBUG 350 printk(".. was usermode - return\n"); 351 #endif 352 return; 353 } 354 /* disable writeback into user space from kernel 355 * (if do_page_fault didn't fix the mapping, 356 * the writeback won't do good) 357 */ 358 disable_wb: 359 #ifdef DEBUG 360 printk(".. disabling wb2\n"); 361 #endif 362 if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr) 363 fp->un.fmt7.wb2s &= ~WBV_040; 364 if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr) 365 fp->un.fmt7.wb3s &= ~WBV_040; 366 } 367 } else { 368 /* In case of a bus error we either kill the process or expect 369 * the kernel to catch the fault, which then is also responsible 370 * for cleaning up the mess. 371 */ 372 current->thread.signo = SIGBUS; 373 current->thread.faddr = fp->un.fmt7.faddr; 374 if (send_fault_sig(&fp->ptregs) >= 0) 375 printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw, 376 fp->un.fmt7.faddr); 377 goto disable_wb; 378 } 379 380 do_040writebacks(fp); 381 } 382 #endif /* CONFIG_M68040 */ 383 384 #if defined(CONFIG_SUN3) 385 #include <asm/sun3mmu.h> 386 387 extern int mmu_emu_handle_fault (unsigned long, int, int); 388 389 /* sun3 version of bus_error030 */ 390 391 static inline void bus_error030 (struct frame *fp) 392 { 393 unsigned char buserr_type = sun3_get_buserr (); 394 unsigned long addr, errorcode; 395 unsigned short ssw = fp->un.fmtb.ssw; 396 extern unsigned long _sun3_map_test_start, _sun3_map_test_end; 397 398 #ifdef DEBUG 399 if (ssw & (FC | FB)) 400 printk ("Instruction fault at %#010lx\n", 401 ssw & FC ? 402 fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2 403 : 404 fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr); 405 if (ssw & DF) 406 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n", 407 ssw & RW ? "read" : "write", 408 fp->un.fmtb.daddr, 409 space_names[ssw & DFC], fp->ptregs.pc); 410 #endif 411 412 /* 413 * Check if this page should be demand-mapped. This needs to go before 414 * the testing for a bad kernel-space access (demand-mapping applies 415 * to kernel accesses too). 416 */ 417 418 if ((ssw & DF) 419 && (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) { 420 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0)) 421 return; 422 } 423 424 /* Check for kernel-space pagefault (BAD). */ 425 if (fp->ptregs.sr & PS_S) { 426 /* kernel fault must be a data fault to user space */ 427 if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) { 428 // try checking the kernel mappings before surrender 429 if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1)) 430 return; 431 /* instruction fault or kernel data fault! */ 432 if (ssw & (FC | FB)) 433 printk ("Instruction fault at %#010lx\n", 434 fp->ptregs.pc); 435 if (ssw & DF) { 436 /* was this fault incurred testing bus mappings? */ 437 if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) && 438 (fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) { 439 send_fault_sig(&fp->ptregs); 440 return; 441 } 442 443 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n", 444 ssw & RW ? "read" : "write", 445 fp->un.fmtb.daddr, 446 space_names[ssw & DFC], fp->ptregs.pc); 447 } 448 printk ("BAD KERNEL BUSERR\n"); 449 450 die_if_kernel("Oops", &fp->ptregs,0); 451 force_sig(SIGKILL, current); 452 return; 453 } 454 } else { 455 /* user fault */ 456 if (!(ssw & (FC | FB)) && !(ssw & DF)) 457 /* not an instruction fault or data fault! BAD */ 458 panic ("USER BUSERR w/o instruction or data fault"); 459 } 460 461 462 /* First handle the data fault, if any. */ 463 if (ssw & DF) { 464 addr = fp->un.fmtb.daddr; 465 466 // errorcode bit 0: 0 -> no page 1 -> protection fault 467 // errorcode bit 1: 0 -> read fault 1 -> write fault 468 469 // (buserr_type & SUN3_BUSERR_PROTERR) -> protection fault 470 // (buserr_type & SUN3_BUSERR_INVALID) -> invalid page fault 471 472 if (buserr_type & SUN3_BUSERR_PROTERR) 473 errorcode = 0x01; 474 else if (buserr_type & SUN3_BUSERR_INVALID) 475 errorcode = 0x00; 476 else { 477 #ifdef DEBUG 478 printk ("*** unexpected busfault type=%#04x\n", buserr_type); 479 printk ("invalid %s access at %#lx from pc %#lx\n", 480 !(ssw & RW) ? "write" : "read", addr, 481 fp->ptregs.pc); 482 #endif 483 die_if_kernel ("Oops", &fp->ptregs, buserr_type); 484 force_sig (SIGBUS, current); 485 return; 486 } 487 488 //todo: wtf is RM bit? --m 489 if (!(ssw & RW) || ssw & RM) 490 errorcode |= 0x02; 491 492 /* Handle page fault. */ 493 do_page_fault (&fp->ptregs, addr, errorcode); 494 495 /* Retry the data fault now. */ 496 return; 497 } 498 499 /* Now handle the instruction fault. */ 500 501 /* Get the fault address. */ 502 if (fp->ptregs.format == 0xA) 503 addr = fp->ptregs.pc + 4; 504 else 505 addr = fp->un.fmtb.baddr; 506 if (ssw & FC) 507 addr -= 2; 508 509 if (buserr_type & SUN3_BUSERR_INVALID) { 510 if (!mmu_emu_handle_fault (fp->un.fmtb.daddr, 1, 0)) 511 do_page_fault (&fp->ptregs, addr, 0); 512 } else { 513 #ifdef DEBUG 514 printk ("protection fault on insn access (segv).\n"); 515 #endif 516 force_sig (SIGSEGV, current); 517 } 518 } 519 #else 520 #if defined(CPU_M68020_OR_M68030) 521 static inline void bus_error030 (struct frame *fp) 522 { 523 volatile unsigned short temp; 524 unsigned short mmusr; 525 unsigned long addr, errorcode; 526 unsigned short ssw = fp->un.fmtb.ssw; 527 #ifdef DEBUG 528 unsigned long desc; 529 530 printk ("pid = %x ", current->pid); 531 printk ("SSW=%#06x ", ssw); 532 533 if (ssw & (FC | FB)) 534 printk ("Instruction fault at %#010lx\n", 535 ssw & FC ? 536 fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2 537 : 538 fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr); 539 if (ssw & DF) 540 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n", 541 ssw & RW ? "read" : "write", 542 fp->un.fmtb.daddr, 543 space_names[ssw & DFC], fp->ptregs.pc); 544 #endif 545 546 /* ++andreas: If a data fault and an instruction fault happen 547 at the same time map in both pages. */ 548 549 /* First handle the data fault, if any. */ 550 if (ssw & DF) { 551 addr = fp->un.fmtb.daddr; 552 553 #ifdef DEBUG 554 asm volatile ("ptestr %3,%2@,#7,%0\n\t" 555 "pmove %%psr,%1" 556 : "=a&" (desc), "=m" (temp) 557 : "a" (addr), "d" (ssw)); 558 #else 559 asm volatile ("ptestr %2,%1@,#7\n\t" 560 "pmove %%psr,%0" 561 : "=m" (temp) : "a" (addr), "d" (ssw)); 562 #endif 563 mmusr = temp; 564 565 #ifdef DEBUG 566 printk("mmusr is %#x for addr %#lx in task %p\n", 567 mmusr, addr, current); 568 printk("descriptor address is %#lx, contents %#lx\n", 569 __va(desc), *(unsigned long *)__va(desc)); 570 #endif 571 572 errorcode = (mmusr & MMU_I) ? 0 : 1; 573 if (!(ssw & RW) || (ssw & RM)) 574 errorcode |= 2; 575 576 if (mmusr & (MMU_I | MMU_WP)) { 577 if (ssw & 4) { 578 printk("Data %s fault at %#010lx in %s (pc=%#lx)\n", 579 ssw & RW ? "read" : "write", 580 fp->un.fmtb.daddr, 581 space_names[ssw & DFC], fp->ptregs.pc); 582 goto buserr; 583 } 584 /* Don't try to do anything further if an exception was 585 handled. */ 586 if (do_page_fault (&fp->ptregs, addr, errorcode) < 0) 587 return; 588 } else if (!(mmusr & MMU_I)) { 589 /* probably a 020 cas fault */ 590 if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0) 591 printk("unexpected bus error (%#x,%#x)\n", ssw, mmusr); 592 } else if (mmusr & (MMU_B|MMU_L|MMU_S)) { 593 printk("invalid %s access at %#lx from pc %#lx\n", 594 !(ssw & RW) ? "write" : "read", addr, 595 fp->ptregs.pc); 596 die_if_kernel("Oops",&fp->ptregs,mmusr); 597 force_sig(SIGSEGV, current); 598 return; 599 } else { 600 #if 0 601 static volatile long tlong; 602 #endif 603 604 printk("weird %s access at %#lx from pc %#lx (ssw is %#x)\n", 605 !(ssw & RW) ? "write" : "read", addr, 606 fp->ptregs.pc, ssw); 607 asm volatile ("ptestr #1,%1@,#0\n\t" 608 "pmove %%psr,%0" 609 : "=m" (temp) 610 : "a" (addr)); 611 mmusr = temp; 612 613 printk ("level 0 mmusr is %#x\n", mmusr); 614 #if 0 615 asm volatile ("pmove %%tt0,%0" 616 : "=m" (tlong)); 617 printk("tt0 is %#lx, ", tlong); 618 asm volatile ("pmove %%tt1,%0" 619 : "=m" (tlong)); 620 printk("tt1 is %#lx\n", tlong); 621 #endif 622 #ifdef DEBUG 623 printk("Unknown SIGSEGV - 1\n"); 624 #endif 625 die_if_kernel("Oops",&fp->ptregs,mmusr); 626 force_sig(SIGSEGV, current); 627 return; 628 } 629 630 /* setup an ATC entry for the access about to be retried */ 631 if (!(ssw & RW) || (ssw & RM)) 632 asm volatile ("ploadw %1,%0@" : /* no outputs */ 633 : "a" (addr), "d" (ssw)); 634 else 635 asm volatile ("ploadr %1,%0@" : /* no outputs */ 636 : "a" (addr), "d" (ssw)); 637 } 638 639 /* Now handle the instruction fault. */ 640 641 if (!(ssw & (FC|FB))) 642 return; 643 644 if (fp->ptregs.sr & PS_S) { 645 printk("Instruction fault at %#010lx\n", 646 fp->ptregs.pc); 647 buserr: 648 printk ("BAD KERNEL BUSERR\n"); 649 die_if_kernel("Oops",&fp->ptregs,0); 650 force_sig(SIGKILL, current); 651 return; 652 } 653 654 /* get the fault address */ 655 if (fp->ptregs.format == 10) 656 addr = fp->ptregs.pc + 4; 657 else 658 addr = fp->un.fmtb.baddr; 659 if (ssw & FC) 660 addr -= 2; 661 662 if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0) 663 /* Insn fault on same page as data fault. But we 664 should still create the ATC entry. */ 665 goto create_atc_entry; 666 667 #ifdef DEBUG 668 asm volatile ("ptestr #1,%2@,#7,%0\n\t" 669 "pmove %%psr,%1" 670 : "=a&" (desc), "=m" (temp) 671 : "a" (addr)); 672 #else 673 asm volatile ("ptestr #1,%1@,#7\n\t" 674 "pmove %%psr,%0" 675 : "=m" (temp) : "a" (addr)); 676 #endif 677 mmusr = temp; 678 679 #ifdef DEBUG 680 printk ("mmusr is %#x for addr %#lx in task %p\n", 681 mmusr, addr, current); 682 printk ("descriptor address is %#lx, contents %#lx\n", 683 __va(desc), *(unsigned long *)__va(desc)); 684 #endif 685 686 if (mmusr & MMU_I) 687 do_page_fault (&fp->ptregs, addr, 0); 688 else if (mmusr & (MMU_B|MMU_L|MMU_S)) { 689 printk ("invalid insn access at %#lx from pc %#lx\n", 690 addr, fp->ptregs.pc); 691 #ifdef DEBUG 692 printk("Unknown SIGSEGV - 2\n"); 693 #endif 694 die_if_kernel("Oops",&fp->ptregs,mmusr); 695 force_sig(SIGSEGV, current); 696 return; 697 } 698 699 create_atc_entry: 700 /* setup an ATC entry for the access about to be retried */ 701 asm volatile ("ploadr #2,%0@" : /* no outputs */ 702 : "a" (addr)); 703 } 704 #endif /* CPU_M68020_OR_M68030 */ 705 #endif /* !CONFIG_SUN3 */ 706 707 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU) 708 #include <asm/mcfmmu.h> 709 710 /* 711 * The following table converts the FS encoding of a ColdFire 712 * exception stack frame into the error_code value needed by 713 * do_fault. 714 */ 715 static const unsigned char fs_err_code[] = { 716 0, /* 0000 */ 717 0, /* 0001 */ 718 0, /* 0010 */ 719 0, /* 0011 */ 720 1, /* 0100 */ 721 0, /* 0101 */ 722 0, /* 0110 */ 723 0, /* 0111 */ 724 2, /* 1000 */ 725 3, /* 1001 */ 726 2, /* 1010 */ 727 0, /* 1011 */ 728 1, /* 1100 */ 729 1, /* 1101 */ 730 0, /* 1110 */ 731 0 /* 1111 */ 732 }; 733 734 static inline void access_errorcf(unsigned int fs, struct frame *fp) 735 { 736 unsigned long mmusr, addr; 737 unsigned int err_code; 738 int need_page_fault; 739 740 mmusr = mmu_read(MMUSR); 741 addr = mmu_read(MMUAR); 742 743 /* 744 * error_code: 745 * bit 0 == 0 means no page found, 1 means protection fault 746 * bit 1 == 0 means read, 1 means write 747 */ 748 switch (fs) { 749 case 5: /* 0101 TLB opword X miss */ 750 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0); 751 addr = fp->ptregs.pc; 752 break; 753 case 6: /* 0110 TLB extension word X miss */ 754 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1); 755 addr = fp->ptregs.pc + sizeof(long); 756 break; 757 case 10: /* 1010 TLB W miss */ 758 need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0); 759 break; 760 case 14: /* 1110 TLB R miss */ 761 need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0); 762 break; 763 default: 764 /* 0000 Normal */ 765 /* 0001 Reserved */ 766 /* 0010 Interrupt during debug service routine */ 767 /* 0011 Reserved */ 768 /* 0100 X Protection */ 769 /* 0111 IFP in emulator mode */ 770 /* 1000 W Protection*/ 771 /* 1001 Write error*/ 772 /* 1011 Reserved*/ 773 /* 1100 R Protection*/ 774 /* 1101 R Protection*/ 775 /* 1111 OEP in emulator mode*/ 776 need_page_fault = 1; 777 break; 778 } 779 780 if (need_page_fault) { 781 err_code = fs_err_code[fs]; 782 if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */ 783 err_code |= 2; /* bit1 - write, bit0 - protection */ 784 do_page_fault(&fp->ptregs, addr, err_code); 785 } 786 } 787 #endif /* CONFIG_COLDFIRE CONFIG_MMU */ 788 789 asmlinkage void buserr_c(struct frame *fp) 790 { 791 /* Only set esp0 if coming from user mode */ 792 if (user_mode(&fp->ptregs)) 793 current->thread.esp0 = (unsigned long) fp; 794 795 #ifdef DEBUG 796 printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format); 797 #endif 798 799 #if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU) 800 if (CPU_IS_COLDFIRE) { 801 unsigned int fs; 802 fs = (fp->ptregs.vector & 0x3) | 803 ((fp->ptregs.vector & 0xc00) >> 8); 804 switch (fs) { 805 case 0x5: 806 case 0x6: 807 case 0x7: 808 case 0x9: 809 case 0xa: 810 case 0xd: 811 case 0xe: 812 case 0xf: 813 access_errorcf(fs, fp); 814 return; 815 default: 816 break; 817 } 818 } 819 #endif /* CONFIG_COLDFIRE && CONFIG_MMU */ 820 821 switch (fp->ptregs.format) { 822 #if defined (CONFIG_M68060) 823 case 4: /* 68060 access error */ 824 access_error060 (fp); 825 break; 826 #endif 827 #if defined (CONFIG_M68040) 828 case 0x7: /* 68040 access error */ 829 access_error040 (fp); 830 break; 831 #endif 832 #if defined (CPU_M68020_OR_M68030) 833 case 0xa: 834 case 0xb: 835 bus_error030 (fp); 836 break; 837 #endif 838 default: 839 die_if_kernel("bad frame format",&fp->ptregs,0); 840 #ifdef DEBUG 841 printk("Unknown SIGSEGV - 4\n"); 842 #endif 843 force_sig(SIGSEGV, current); 844 } 845 } 846 847 848 static int kstack_depth_to_print = 48; 849 850 void show_trace(unsigned long *stack) 851 { 852 unsigned long *endstack; 853 unsigned long addr; 854 int i; 855 856 printk("Call Trace:"); 857 addr = (unsigned long)stack + THREAD_SIZE - 1; 858 endstack = (unsigned long *)(addr & -THREAD_SIZE); 859 i = 0; 860 while (stack + 1 <= endstack) { 861 addr = *stack++; 862 /* 863 * If the address is either in the text segment of the 864 * kernel, or in the region which contains vmalloc'ed 865 * memory, it *may* be the address of a calling 866 * routine; if so, print it so that someone tracing 867 * down the cause of the crash will be able to figure 868 * out the call path that was taken. 869 */ 870 if (__kernel_text_address(addr)) { 871 #ifndef CONFIG_KALLSYMS 872 if (i % 5 == 0) 873 printk("\n "); 874 #endif 875 printk(" [<%08lx>] %pS\n", addr, (void *)addr); 876 i++; 877 } 878 } 879 printk("\n"); 880 } 881 882 void show_registers(struct pt_regs *regs) 883 { 884 struct frame *fp = (struct frame *)regs; 885 mm_segment_t old_fs = get_fs(); 886 u16 c, *cp; 887 unsigned long addr; 888 int i; 889 890 print_modules(); 891 printk("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc); 892 printk("SR: %04x SP: %p a2: %08lx\n", regs->sr, regs, regs->a2); 893 printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", 894 regs->d0, regs->d1, regs->d2, regs->d3); 895 printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", 896 regs->d4, regs->d5, regs->a0, regs->a1); 897 898 printk("Process %s (pid: %d, task=%p)\n", 899 current->comm, task_pid_nr(current), current); 900 addr = (unsigned long)&fp->un; 901 printk("Frame format=%X ", regs->format); 902 switch (regs->format) { 903 case 0x2: 904 printk("instr addr=%08lx\n", fp->un.fmt2.iaddr); 905 addr += sizeof(fp->un.fmt2); 906 break; 907 case 0x3: 908 printk("eff addr=%08lx\n", fp->un.fmt3.effaddr); 909 addr += sizeof(fp->un.fmt3); 910 break; 911 case 0x4: 912 printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lx\n" 913 : "eff addr=%08lx pc=%08lx\n"), 914 fp->un.fmt4.effaddr, fp->un.fmt4.pc); 915 addr += sizeof(fp->un.fmt4); 916 break; 917 case 0x7: 918 printk("eff addr=%08lx ssw=%04x faddr=%08lx\n", 919 fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr); 920 printk("wb 1 stat/addr/data: %04x %08lx %08lx\n", 921 fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0); 922 printk("wb 2 stat/addr/data: %04x %08lx %08lx\n", 923 fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d); 924 printk("wb 3 stat/addr/data: %04x %08lx %08lx\n", 925 fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d); 926 printk("push data: %08lx %08lx %08lx %08lx\n", 927 fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2, 928 fp->un.fmt7.pd3); 929 addr += sizeof(fp->un.fmt7); 930 break; 931 case 0x9: 932 printk("instr addr=%08lx\n", fp->un.fmt9.iaddr); 933 addr += sizeof(fp->un.fmt9); 934 break; 935 case 0xa: 936 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n", 937 fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb, 938 fp->un.fmta.daddr, fp->un.fmta.dobuf); 939 addr += sizeof(fp->un.fmta); 940 break; 941 case 0xb: 942 printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n", 943 fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb, 944 fp->un.fmtb.daddr, fp->un.fmtb.dobuf); 945 printk("baddr=%08lx dibuf=%08lx ver=%x\n", 946 fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver); 947 addr += sizeof(fp->un.fmtb); 948 break; 949 default: 950 printk("\n"); 951 } 952 show_stack(NULL, (unsigned long *)addr); 953 954 printk("Code:"); 955 set_fs(KERNEL_DS); 956 cp = (u16 *)regs->pc; 957 for (i = -8; i < 16; i++) { 958 if (get_user(c, cp + i) && i >= 0) { 959 printk(" Bad PC value."); 960 break; 961 } 962 printk(i ? " %04x" : " <%04x>", c); 963 } 964 set_fs(old_fs); 965 printk ("\n"); 966 } 967 968 void show_stack(struct task_struct *task, unsigned long *stack) 969 { 970 unsigned long *p; 971 unsigned long *endstack; 972 int i; 973 974 if (!stack) { 975 if (task) 976 stack = (unsigned long *)task->thread.esp0; 977 else 978 stack = (unsigned long *)&stack; 979 } 980 endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE); 981 982 printk("Stack from %08lx:", (unsigned long)stack); 983 p = stack; 984 for (i = 0; i < kstack_depth_to_print; i++) { 985 if (p + 1 > endstack) 986 break; 987 if (i % 8 == 0) 988 printk("\n "); 989 printk(" %08lx", *p++); 990 } 991 printk("\n"); 992 show_trace(stack); 993 } 994 995 /* 996 * The architecture-independent backtrace generator 997 */ 998 void dump_stack(void) 999 { 1000 unsigned long stack; 1001 1002 show_trace(&stack); 1003 } 1004 1005 EXPORT_SYMBOL(dump_stack); 1006 1007 /* 1008 * The vector number returned in the frame pointer may also contain 1009 * the "fs" (Fault Status) bits on ColdFire. These are in the bottom 1010 * 2 bits, and upper 2 bits. So we need to mask out the real vector 1011 * number before using it in comparisons. You don't need to do this on 1012 * real 68k parts, but it won't hurt either. 1013 */ 1014 1015 void bad_super_trap (struct frame *fp) 1016 { 1017 int vector = (fp->ptregs.vector >> 2) & 0xff; 1018 1019 console_verbose(); 1020 if (vector < ARRAY_SIZE(vec_names)) 1021 printk ("*** %s *** FORMAT=%X\n", 1022 vec_names[vector], 1023 fp->ptregs.format); 1024 else 1025 printk ("*** Exception %d *** FORMAT=%X\n", 1026 vector, fp->ptregs.format); 1027 if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) { 1028 unsigned short ssw = fp->un.fmtb.ssw; 1029 1030 printk ("SSW=%#06x ", ssw); 1031 1032 if (ssw & RC) 1033 printk ("Pipe stage C instruction fault at %#010lx\n", 1034 (fp->ptregs.format) == 0xA ? 1035 fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2); 1036 if (ssw & RB) 1037 printk ("Pipe stage B instruction fault at %#010lx\n", 1038 (fp->ptregs.format) == 0xA ? 1039 fp->ptregs.pc + 4 : fp->un.fmtb.baddr); 1040 if (ssw & DF) 1041 printk ("Data %s fault at %#010lx in %s (pc=%#lx)\n", 1042 ssw & RW ? "read" : "write", 1043 fp->un.fmtb.daddr, space_names[ssw & DFC], 1044 fp->ptregs.pc); 1045 } 1046 printk ("Current process id is %d\n", task_pid_nr(current)); 1047 die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0); 1048 } 1049 1050 asmlinkage void trap_c(struct frame *fp) 1051 { 1052 int sig; 1053 int vector = (fp->ptregs.vector >> 2) & 0xff; 1054 siginfo_t info; 1055 1056 if (fp->ptregs.sr & PS_S) { 1057 if (vector == VEC_TRACE) { 1058 /* traced a trapping instruction on a 68020/30, 1059 * real exception will be executed afterwards. 1060 */ 1061 } else if (!handle_kernel_fault(&fp->ptregs)) 1062 bad_super_trap(fp); 1063 return; 1064 } 1065 1066 /* send the appropriate signal to the user program */ 1067 switch (vector) { 1068 case VEC_ADDRERR: 1069 info.si_code = BUS_ADRALN; 1070 sig = SIGBUS; 1071 break; 1072 case VEC_ILLEGAL: 1073 case VEC_LINE10: 1074 case VEC_LINE11: 1075 info.si_code = ILL_ILLOPC; 1076 sig = SIGILL; 1077 break; 1078 case VEC_PRIV: 1079 info.si_code = ILL_PRVOPC; 1080 sig = SIGILL; 1081 break; 1082 case VEC_COPROC: 1083 info.si_code = ILL_COPROC; 1084 sig = SIGILL; 1085 break; 1086 case VEC_TRAP1: 1087 case VEC_TRAP2: 1088 case VEC_TRAP3: 1089 case VEC_TRAP4: 1090 case VEC_TRAP5: 1091 case VEC_TRAP6: 1092 case VEC_TRAP7: 1093 case VEC_TRAP8: 1094 case VEC_TRAP9: 1095 case VEC_TRAP10: 1096 case VEC_TRAP11: 1097 case VEC_TRAP12: 1098 case VEC_TRAP13: 1099 case VEC_TRAP14: 1100 info.si_code = ILL_ILLTRP; 1101 sig = SIGILL; 1102 break; 1103 case VEC_FPBRUC: 1104 case VEC_FPOE: 1105 case VEC_FPNAN: 1106 info.si_code = FPE_FLTINV; 1107 sig = SIGFPE; 1108 break; 1109 case VEC_FPIR: 1110 info.si_code = FPE_FLTRES; 1111 sig = SIGFPE; 1112 break; 1113 case VEC_FPDIVZ: 1114 info.si_code = FPE_FLTDIV; 1115 sig = SIGFPE; 1116 break; 1117 case VEC_FPUNDER: 1118 info.si_code = FPE_FLTUND; 1119 sig = SIGFPE; 1120 break; 1121 case VEC_FPOVER: 1122 info.si_code = FPE_FLTOVF; 1123 sig = SIGFPE; 1124 break; 1125 case VEC_ZERODIV: 1126 info.si_code = FPE_INTDIV; 1127 sig = SIGFPE; 1128 break; 1129 case VEC_CHK: 1130 case VEC_TRAP: 1131 info.si_code = FPE_INTOVF; 1132 sig = SIGFPE; 1133 break; 1134 case VEC_TRACE: /* ptrace single step */ 1135 info.si_code = TRAP_TRACE; 1136 sig = SIGTRAP; 1137 break; 1138 case VEC_TRAP15: /* breakpoint */ 1139 info.si_code = TRAP_BRKPT; 1140 sig = SIGTRAP; 1141 break; 1142 default: 1143 info.si_code = ILL_ILLOPC; 1144 sig = SIGILL; 1145 break; 1146 } 1147 info.si_signo = sig; 1148 info.si_errno = 0; 1149 switch (fp->ptregs.format) { 1150 default: 1151 info.si_addr = (void *) fp->ptregs.pc; 1152 break; 1153 case 2: 1154 info.si_addr = (void *) fp->un.fmt2.iaddr; 1155 break; 1156 case 7: 1157 info.si_addr = (void *) fp->un.fmt7.effaddr; 1158 break; 1159 case 9: 1160 info.si_addr = (void *) fp->un.fmt9.iaddr; 1161 break; 1162 case 10: 1163 info.si_addr = (void *) fp->un.fmta.daddr; 1164 break; 1165 case 11: 1166 info.si_addr = (void *) fp->un.fmtb.daddr; 1167 break; 1168 } 1169 force_sig_info (sig, &info, current); 1170 } 1171 1172 void die_if_kernel (char *str, struct pt_regs *fp, int nr) 1173 { 1174 if (!(fp->sr & PS_S)) 1175 return; 1176 1177 console_verbose(); 1178 printk("%s: %08x\n",str,nr); 1179 show_registers(fp); 1180 add_taint(TAINT_DIE); 1181 do_exit(SIGSEGV); 1182 } 1183 1184 asmlinkage void set_esp0(unsigned long ssp) 1185 { 1186 current->thread.esp0 = ssp; 1187 } 1188 1189 /* 1190 * This function is called if an error occur while accessing 1191 * user-space from the fpsp040 code. 1192 */ 1193 asmlinkage void fpsp040_die(void) 1194 { 1195 do_exit(SIGSEGV); 1196 } 1197 1198 #ifdef CONFIG_M68KFPU_EMU 1199 asmlinkage void fpemu_signal(int signal, int code, void *addr) 1200 { 1201 siginfo_t info; 1202 1203 info.si_signo = signal; 1204 info.si_errno = 0; 1205 info.si_code = code; 1206 info.si_addr = addr; 1207 force_sig_info(signal, &info, current); 1208 } 1209 #endif 1210