1 /* 2 * arch/s390/kernel/traps.c 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 8 * 9 * Derived from "arch/i386/kernel/traps.c" 10 * Copyright (C) 1991, 1992 Linus Torvalds 11 */ 12 13 /* 14 * 'Traps.c' handles hardware traps and faults after we have saved some 15 * state in 'asm.s'. 16 */ 17 #include <linux/sched.h> 18 #include <linux/kernel.h> 19 #include <linux/string.h> 20 #include <linux/errno.h> 21 #include <linux/ptrace.h> 22 #include <linux/timer.h> 23 #include <linux/mm.h> 24 #include <linux/smp.h> 25 #include <linux/smp_lock.h> 26 #include <linux/init.h> 27 #include <linux/interrupt.h> 28 #include <linux/delay.h> 29 #include <linux/module.h> 30 #include <linux/kallsyms.h> 31 #include <linux/reboot.h> 32 #include <linux/kprobes.h> 33 #include <linux/bug.h> 34 #include <asm/system.h> 35 #include <asm/uaccess.h> 36 #include <asm/io.h> 37 #include <asm/atomic.h> 38 #include <asm/mathemu.h> 39 #include <asm/cpcmd.h> 40 #include <asm/s390_ext.h> 41 #include <asm/lowcore.h> 42 #include <asm/debug.h> 43 #include <asm/kdebug.h> 44 45 /* Called from entry.S only */ 46 extern void handle_per_exception(struct pt_regs *regs); 47 48 typedef void pgm_check_handler_t(struct pt_regs *, long); 49 pgm_check_handler_t *pgm_check_table[128]; 50 51 #ifdef CONFIG_SYSCTL 52 #ifdef CONFIG_PROCESS_DEBUG 53 int sysctl_userprocess_debug = 1; 54 #else 55 int sysctl_userprocess_debug = 0; 56 #endif 57 #endif 58 59 extern pgm_check_handler_t do_protection_exception; 60 extern pgm_check_handler_t do_dat_exception; 61 extern pgm_check_handler_t do_monitor_call; 62 63 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; }) 64 65 #ifndef CONFIG_64BIT 66 #define FOURLONG "%08lx %08lx %08lx %08lx\n" 67 static int kstack_depth_to_print = 12; 68 #else /* CONFIG_64BIT */ 69 #define FOURLONG "%016lx %016lx %016lx %016lx\n" 70 static int kstack_depth_to_print = 20; 71 #endif /* CONFIG_64BIT */ 72 73 ATOMIC_NOTIFIER_HEAD(s390die_chain); 74 75 int register_die_notifier(struct notifier_block *nb) 76 { 77 return atomic_notifier_chain_register(&s390die_chain, nb); 78 } 79 EXPORT_SYMBOL(register_die_notifier); 80 81 int unregister_die_notifier(struct notifier_block *nb) 82 { 83 return atomic_notifier_chain_unregister(&s390die_chain, nb); 84 } 85 EXPORT_SYMBOL(unregister_die_notifier); 86 87 /* 88 * For show_trace we have tree different stack to consider: 89 * - the panic stack which is used if the kernel stack has overflown 90 * - the asynchronous interrupt stack (cpu related) 91 * - the synchronous kernel stack (process related) 92 * The stack trace can start at any of the three stack and can potentially 93 * touch all of them. The order is: panic stack, async stack, sync stack. 94 */ 95 static unsigned long 96 __show_trace(unsigned long sp, unsigned long low, unsigned long high) 97 { 98 struct stack_frame *sf; 99 struct pt_regs *regs; 100 101 while (1) { 102 sp = sp & PSW_ADDR_INSN; 103 if (sp < low || sp > high - sizeof(*sf)) 104 return sp; 105 sf = (struct stack_frame *) sp; 106 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 107 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); 108 /* Follow the backchain. */ 109 while (1) { 110 low = sp; 111 sp = sf->back_chain & PSW_ADDR_INSN; 112 if (!sp) 113 break; 114 if (sp <= low || sp > high - sizeof(*sf)) 115 return sp; 116 sf = (struct stack_frame *) sp; 117 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 118 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); 119 } 120 /* Zero backchain detected, check for interrupt frame. */ 121 sp = (unsigned long) (sf + 1); 122 if (sp <= low || sp > high - sizeof(*regs)) 123 return sp; 124 regs = (struct pt_regs *) sp; 125 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); 126 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); 127 low = sp; 128 sp = regs->gprs[15]; 129 } 130 } 131 132 void show_trace(struct task_struct *task, unsigned long *stack) 133 { 134 register unsigned long __r15 asm ("15"); 135 unsigned long sp; 136 137 sp = (unsigned long) stack; 138 if (!sp) 139 sp = task ? task->thread.ksp : __r15; 140 printk("Call Trace:\n"); 141 #ifdef CONFIG_CHECK_STACK 142 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, 143 S390_lowcore.panic_stack); 144 #endif 145 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, 146 S390_lowcore.async_stack); 147 if (task) 148 __show_trace(sp, (unsigned long) task_stack_page(task), 149 (unsigned long) task_stack_page(task) + THREAD_SIZE); 150 else 151 __show_trace(sp, S390_lowcore.thread_info, 152 S390_lowcore.thread_info + THREAD_SIZE); 153 printk("\n"); 154 if (!task) 155 task = current; 156 debug_show_held_locks(task); 157 } 158 159 void show_stack(struct task_struct *task, unsigned long *sp) 160 { 161 register unsigned long * __r15 asm ("15"); 162 unsigned long *stack; 163 int i; 164 165 if (!sp) 166 stack = task ? (unsigned long *) task->thread.ksp : __r15; 167 else 168 stack = sp; 169 170 for (i = 0; i < kstack_depth_to_print; i++) { 171 if (((addr_t) stack & (THREAD_SIZE-1)) == 0) 172 break; 173 if (i && ((i * sizeof (long) % 32) == 0)) 174 printk("\n "); 175 printk("%p ", (void *)*stack++); 176 } 177 printk("\n"); 178 show_trace(task, sp); 179 } 180 181 /* 182 * The architecture-independent dump_stack generator 183 */ 184 void dump_stack(void) 185 { 186 show_stack(NULL, NULL); 187 } 188 189 EXPORT_SYMBOL(dump_stack); 190 191 static inline int mask_bits(struct pt_regs *regs, unsigned long bits) 192 { 193 return (regs->psw.mask & bits) / ((~bits + 1) & bits); 194 } 195 196 void show_registers(struct pt_regs *regs) 197 { 198 char *mode; 199 200 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl"; 201 printk("%s PSW : %p %p", 202 mode, (void *) regs->psw.mask, 203 (void *) regs->psw.addr); 204 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); 205 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x " 206 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER), 207 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO), 208 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY), 209 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT), 210 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC), 211 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM)); 212 #ifdef CONFIG_64BIT 213 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS)); 214 #endif 215 printk("\n%s GPRS: " FOURLONG, mode, 216 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); 217 printk(" " FOURLONG, 218 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); 219 printk(" " FOURLONG, 220 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); 221 printk(" " FOURLONG, 222 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); 223 224 show_code(regs); 225 } 226 227 /* This is called from fs/proc/array.c */ 228 char *task_show_regs(struct task_struct *task, char *buffer) 229 { 230 struct pt_regs *regs; 231 232 regs = task_pt_regs(task); 233 buffer += sprintf(buffer, "task: %p, ksp: %p\n", 234 task, (void *)task->thread.ksp); 235 buffer += sprintf(buffer, "User PSW : %p %p\n", 236 (void *) regs->psw.mask, (void *)regs->psw.addr); 237 238 buffer += sprintf(buffer, "User GPRS: " FOURLONG, 239 regs->gprs[0], regs->gprs[1], 240 regs->gprs[2], regs->gprs[3]); 241 buffer += sprintf(buffer, " " FOURLONG, 242 regs->gprs[4], regs->gprs[5], 243 regs->gprs[6], regs->gprs[7]); 244 buffer += sprintf(buffer, " " FOURLONG, 245 regs->gprs[8], regs->gprs[9], 246 regs->gprs[10], regs->gprs[11]); 247 buffer += sprintf(buffer, " " FOURLONG, 248 regs->gprs[12], regs->gprs[13], 249 regs->gprs[14], regs->gprs[15]); 250 buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n", 251 task->thread.acrs[0], task->thread.acrs[1], 252 task->thread.acrs[2], task->thread.acrs[3]); 253 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 254 task->thread.acrs[4], task->thread.acrs[5], 255 task->thread.acrs[6], task->thread.acrs[7]); 256 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 257 task->thread.acrs[8], task->thread.acrs[9], 258 task->thread.acrs[10], task->thread.acrs[11]); 259 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 260 task->thread.acrs[12], task->thread.acrs[13], 261 task->thread.acrs[14], task->thread.acrs[15]); 262 return buffer; 263 } 264 265 static DEFINE_SPINLOCK(die_lock); 266 267 void die(const char * str, struct pt_regs * regs, long err) 268 { 269 static int die_counter; 270 271 debug_stop_all(); 272 console_verbose(); 273 spin_lock_irq(&die_lock); 274 bust_spinlocks(1); 275 printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); 276 show_regs(regs); 277 bust_spinlocks(0); 278 spin_unlock_irq(&die_lock); 279 if (in_interrupt()) 280 panic("Fatal exception in interrupt"); 281 if (panic_on_oops) 282 panic("Fatal exception: panic_on_oops"); 283 do_exit(SIGSEGV); 284 } 285 286 static void inline 287 report_user_fault(long interruption_code, struct pt_regs *regs) 288 { 289 #if defined(CONFIG_SYSCTL) 290 if (!sysctl_userprocess_debug) 291 return; 292 #endif 293 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG) 294 printk("User process fault: interruption code 0x%lX\n", 295 interruption_code); 296 show_regs(regs); 297 #endif 298 } 299 300 int is_valid_bugaddr(unsigned long addr) 301 { 302 return 1; 303 } 304 305 static void __kprobes inline do_trap(long interruption_code, int signr, 306 char *str, struct pt_regs *regs, 307 siginfo_t *info) 308 { 309 /* 310 * We got all needed information from the lowcore and can 311 * now safely switch on interrupts. 312 */ 313 if (regs->psw.mask & PSW_MASK_PSTATE) 314 local_irq_enable(); 315 316 if (notify_die(DIE_TRAP, str, regs, interruption_code, 317 interruption_code, signr) == NOTIFY_STOP) 318 return; 319 320 if (regs->psw.mask & PSW_MASK_PSTATE) { 321 struct task_struct *tsk = current; 322 323 tsk->thread.trap_no = interruption_code & 0xffff; 324 force_sig_info(signr, info, tsk); 325 report_user_fault(interruption_code, regs); 326 } else { 327 const struct exception_table_entry *fixup; 328 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 329 if (fixup) 330 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 331 else { 332 enum bug_trap_type btt; 333 334 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN); 335 if (btt == BUG_TRAP_TYPE_WARN) 336 return; 337 die(str, regs, interruption_code); 338 } 339 } 340 } 341 342 static inline void __user *get_check_address(struct pt_regs *regs) 343 { 344 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); 345 } 346 347 void __kprobes do_single_step(struct pt_regs *regs) 348 { 349 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, 350 SIGTRAP) == NOTIFY_STOP){ 351 return; 352 } 353 if ((current->ptrace & PT_PTRACED) != 0) 354 force_sig(SIGTRAP, current); 355 } 356 357 static void default_trap_handler(struct pt_regs * regs, long interruption_code) 358 { 359 if (regs->psw.mask & PSW_MASK_PSTATE) { 360 local_irq_enable(); 361 do_exit(SIGSEGV); 362 report_user_fault(interruption_code, regs); 363 } else 364 die("Unknown program exception", regs, interruption_code); 365 } 366 367 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ 368 static void name(struct pt_regs * regs, long interruption_code) \ 369 { \ 370 siginfo_t info; \ 371 info.si_signo = signr; \ 372 info.si_errno = 0; \ 373 info.si_code = sicode; \ 374 info.si_addr = siaddr; \ 375 do_trap(interruption_code, signr, str, regs, &info); \ 376 } 377 378 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, 379 ILL_ILLADR, get_check_address(regs)) 380 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, 381 ILL_ILLOPN, get_check_address(regs)) 382 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, 383 FPE_INTDIV, get_check_address(regs)) 384 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, 385 FPE_INTOVF, get_check_address(regs)) 386 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, 387 FPE_FLTOVF, get_check_address(regs)) 388 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, 389 FPE_FLTUND, get_check_address(regs)) 390 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, 391 FPE_FLTRES, get_check_address(regs)) 392 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, 393 FPE_FLTDIV, get_check_address(regs)) 394 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, 395 FPE_FLTINV, get_check_address(regs)) 396 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, 397 ILL_ILLOPN, get_check_address(regs)) 398 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, 399 ILL_PRVOPC, get_check_address(regs)) 400 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, 401 ILL_ILLOPN, get_check_address(regs)) 402 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, 403 ILL_ILLOPN, get_check_address(regs)) 404 405 static inline void 406 do_fp_trap(struct pt_regs *regs, void __user *location, 407 int fpc, long interruption_code) 408 { 409 siginfo_t si; 410 411 si.si_signo = SIGFPE; 412 si.si_errno = 0; 413 si.si_addr = location; 414 si.si_code = 0; 415 /* FPC[2] is Data Exception Code */ 416 if ((fpc & 0x00000300) == 0) { 417 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 418 if (fpc & 0x8000) /* invalid fp operation */ 419 si.si_code = FPE_FLTINV; 420 else if (fpc & 0x4000) /* div by 0 */ 421 si.si_code = FPE_FLTDIV; 422 else if (fpc & 0x2000) /* overflow */ 423 si.si_code = FPE_FLTOVF; 424 else if (fpc & 0x1000) /* underflow */ 425 si.si_code = FPE_FLTUND; 426 else if (fpc & 0x0800) /* inexact */ 427 si.si_code = FPE_FLTRES; 428 } 429 current->thread.ieee_instruction_pointer = (addr_t) location; 430 do_trap(interruption_code, SIGFPE, 431 "floating point exception", regs, &si); 432 } 433 434 static void illegal_op(struct pt_regs * regs, long interruption_code) 435 { 436 siginfo_t info; 437 __u8 opcode[6]; 438 __u16 __user *location; 439 int signal = 0; 440 441 location = get_check_address(regs); 442 443 /* 444 * We got all needed information from the lowcore and can 445 * now safely switch on interrupts. 446 */ 447 if (regs->psw.mask & PSW_MASK_PSTATE) 448 local_irq_enable(); 449 450 if (regs->psw.mask & PSW_MASK_PSTATE) { 451 if (get_user(*((__u16 *) opcode), (__u16 __user *) location)) 452 return; 453 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { 454 if (current->ptrace & PT_PTRACED) 455 force_sig(SIGTRAP, current); 456 else 457 signal = SIGILL; 458 #ifdef CONFIG_MATHEMU 459 } else if (opcode[0] == 0xb3) { 460 if (get_user(*((__u16 *) (opcode+2)), location+1)) 461 return; 462 signal = math_emu_b3(opcode, regs); 463 } else if (opcode[0] == 0xed) { 464 if (get_user(*((__u32 *) (opcode+2)), 465 (__u32 __user *)(location+1))) 466 return; 467 signal = math_emu_ed(opcode, regs); 468 } else if (*((__u16 *) opcode) == 0xb299) { 469 if (get_user(*((__u16 *) (opcode+2)), location+1)) 470 return; 471 signal = math_emu_srnm(opcode, regs); 472 } else if (*((__u16 *) opcode) == 0xb29c) { 473 if (get_user(*((__u16 *) (opcode+2)), location+1)) 474 return; 475 signal = math_emu_stfpc(opcode, regs); 476 } else if (*((__u16 *) opcode) == 0xb29d) { 477 if (get_user(*((__u16 *) (opcode+2)), location+1)) 478 return; 479 signal = math_emu_lfpc(opcode, regs); 480 #endif 481 } else 482 signal = SIGILL; 483 } else { 484 /* 485 * If we get an illegal op in kernel mode, send it through the 486 * kprobes notifier. If kprobes doesn't pick it up, SIGILL 487 */ 488 if (notify_die(DIE_BPT, "bpt", regs, interruption_code, 489 3, SIGTRAP) != NOTIFY_STOP) 490 signal = SIGILL; 491 } 492 493 #ifdef CONFIG_MATHEMU 494 if (signal == SIGFPE) 495 do_fp_trap(regs, location, 496 current->thread.fp_regs.fpc, interruption_code); 497 else if (signal == SIGSEGV) { 498 info.si_signo = signal; 499 info.si_errno = 0; 500 info.si_code = SEGV_MAPERR; 501 info.si_addr = (void __user *) location; 502 do_trap(interruption_code, signal, 503 "user address fault", regs, &info); 504 } else 505 #endif 506 if (signal) { 507 info.si_signo = signal; 508 info.si_errno = 0; 509 info.si_code = ILL_ILLOPC; 510 info.si_addr = (void __user *) location; 511 do_trap(interruption_code, signal, 512 "illegal operation", regs, &info); 513 } 514 } 515 516 517 #ifdef CONFIG_MATHEMU 518 asmlinkage void 519 specification_exception(struct pt_regs * regs, long interruption_code) 520 { 521 __u8 opcode[6]; 522 __u16 __user *location = NULL; 523 int signal = 0; 524 525 location = (__u16 __user *) get_check_address(regs); 526 527 /* 528 * We got all needed information from the lowcore and can 529 * now safely switch on interrupts. 530 */ 531 if (regs->psw.mask & PSW_MASK_PSTATE) 532 local_irq_enable(); 533 534 if (regs->psw.mask & PSW_MASK_PSTATE) { 535 get_user(*((__u16 *) opcode), location); 536 switch (opcode[0]) { 537 case 0x28: /* LDR Rx,Ry */ 538 signal = math_emu_ldr(opcode); 539 break; 540 case 0x38: /* LER Rx,Ry */ 541 signal = math_emu_ler(opcode); 542 break; 543 case 0x60: /* STD R,D(X,B) */ 544 get_user(*((__u16 *) (opcode+2)), location+1); 545 signal = math_emu_std(opcode, regs); 546 break; 547 case 0x68: /* LD R,D(X,B) */ 548 get_user(*((__u16 *) (opcode+2)), location+1); 549 signal = math_emu_ld(opcode, regs); 550 break; 551 case 0x70: /* STE R,D(X,B) */ 552 get_user(*((__u16 *) (opcode+2)), location+1); 553 signal = math_emu_ste(opcode, regs); 554 break; 555 case 0x78: /* LE R,D(X,B) */ 556 get_user(*((__u16 *) (opcode+2)), location+1); 557 signal = math_emu_le(opcode, regs); 558 break; 559 default: 560 signal = SIGILL; 561 break; 562 } 563 } else 564 signal = SIGILL; 565 566 if (signal == SIGFPE) 567 do_fp_trap(regs, location, 568 current->thread.fp_regs.fpc, interruption_code); 569 else if (signal) { 570 siginfo_t info; 571 info.si_signo = signal; 572 info.si_errno = 0; 573 info.si_code = ILL_ILLOPN; 574 info.si_addr = location; 575 do_trap(interruption_code, signal, 576 "specification exception", regs, &info); 577 } 578 } 579 #else 580 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 581 ILL_ILLOPN, get_check_address(regs)); 582 #endif 583 584 static void data_exception(struct pt_regs * regs, long interruption_code) 585 { 586 __u16 __user *location; 587 int signal = 0; 588 589 location = get_check_address(regs); 590 591 /* 592 * We got all needed information from the lowcore and can 593 * now safely switch on interrupts. 594 */ 595 if (regs->psw.mask & PSW_MASK_PSTATE) 596 local_irq_enable(); 597 598 if (MACHINE_HAS_IEEE) 599 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc)); 600 601 #ifdef CONFIG_MATHEMU 602 else if (regs->psw.mask & PSW_MASK_PSTATE) { 603 __u8 opcode[6]; 604 get_user(*((__u16 *) opcode), location); 605 switch (opcode[0]) { 606 case 0x28: /* LDR Rx,Ry */ 607 signal = math_emu_ldr(opcode); 608 break; 609 case 0x38: /* LER Rx,Ry */ 610 signal = math_emu_ler(opcode); 611 break; 612 case 0x60: /* STD R,D(X,B) */ 613 get_user(*((__u16 *) (opcode+2)), location+1); 614 signal = math_emu_std(opcode, regs); 615 break; 616 case 0x68: /* LD R,D(X,B) */ 617 get_user(*((__u16 *) (opcode+2)), location+1); 618 signal = math_emu_ld(opcode, regs); 619 break; 620 case 0x70: /* STE R,D(X,B) */ 621 get_user(*((__u16 *) (opcode+2)), location+1); 622 signal = math_emu_ste(opcode, regs); 623 break; 624 case 0x78: /* LE R,D(X,B) */ 625 get_user(*((__u16 *) (opcode+2)), location+1); 626 signal = math_emu_le(opcode, regs); 627 break; 628 case 0xb3: 629 get_user(*((__u16 *) (opcode+2)), location+1); 630 signal = math_emu_b3(opcode, regs); 631 break; 632 case 0xed: 633 get_user(*((__u32 *) (opcode+2)), 634 (__u32 __user *)(location+1)); 635 signal = math_emu_ed(opcode, regs); 636 break; 637 case 0xb2: 638 if (opcode[1] == 0x99) { 639 get_user(*((__u16 *) (opcode+2)), location+1); 640 signal = math_emu_srnm(opcode, regs); 641 } else if (opcode[1] == 0x9c) { 642 get_user(*((__u16 *) (opcode+2)), location+1); 643 signal = math_emu_stfpc(opcode, regs); 644 } else if (opcode[1] == 0x9d) { 645 get_user(*((__u16 *) (opcode+2)), location+1); 646 signal = math_emu_lfpc(opcode, regs); 647 } else 648 signal = SIGILL; 649 break; 650 default: 651 signal = SIGILL; 652 break; 653 } 654 } 655 #endif 656 if (current->thread.fp_regs.fpc & FPC_DXC_MASK) 657 signal = SIGFPE; 658 else 659 signal = SIGILL; 660 if (signal == SIGFPE) 661 do_fp_trap(regs, location, 662 current->thread.fp_regs.fpc, interruption_code); 663 else if (signal) { 664 siginfo_t info; 665 info.si_signo = signal; 666 info.si_errno = 0; 667 info.si_code = ILL_ILLOPN; 668 info.si_addr = location; 669 do_trap(interruption_code, signal, 670 "data exception", regs, &info); 671 } 672 } 673 674 static void space_switch_exception(struct pt_regs * regs, long int_code) 675 { 676 siginfo_t info; 677 678 /* Set user psw back to home space mode. */ 679 if (regs->psw.mask & PSW_MASK_PSTATE) 680 regs->psw.mask |= PSW_ASC_HOME; 681 /* Send SIGILL. */ 682 info.si_signo = SIGILL; 683 info.si_errno = 0; 684 info.si_code = ILL_PRVOPC; 685 info.si_addr = get_check_address(regs); 686 do_trap(int_code, SIGILL, "space switch event", regs, &info); 687 } 688 689 asmlinkage void kernel_stack_overflow(struct pt_regs * regs) 690 { 691 bust_spinlocks(1); 692 printk("Kernel stack overflow.\n"); 693 show_regs(regs); 694 bust_spinlocks(0); 695 panic("Corrupt kernel stack, can't continue."); 696 } 697 698 /* init is done in lowcore.S and head.S */ 699 700 void __init trap_init(void) 701 { 702 int i; 703 704 for (i = 0; i < 128; i++) 705 pgm_check_table[i] = &default_trap_handler; 706 pgm_check_table[1] = &illegal_op; 707 pgm_check_table[2] = &privileged_op; 708 pgm_check_table[3] = &execute_exception; 709 pgm_check_table[4] = &do_protection_exception; 710 pgm_check_table[5] = &addressing_exception; 711 pgm_check_table[6] = &specification_exception; 712 pgm_check_table[7] = &data_exception; 713 pgm_check_table[8] = &overflow_exception; 714 pgm_check_table[9] = ÷_exception; 715 pgm_check_table[0x0A] = &overflow_exception; 716 pgm_check_table[0x0B] = ÷_exception; 717 pgm_check_table[0x0C] = &hfp_overflow_exception; 718 pgm_check_table[0x0D] = &hfp_underflow_exception; 719 pgm_check_table[0x0E] = &hfp_significance_exception; 720 pgm_check_table[0x0F] = &hfp_divide_exception; 721 pgm_check_table[0x10] = &do_dat_exception; 722 pgm_check_table[0x11] = &do_dat_exception; 723 pgm_check_table[0x12] = &translation_exception; 724 pgm_check_table[0x13] = &special_op_exception; 725 #ifdef CONFIG_64BIT 726 pgm_check_table[0x38] = &do_dat_exception; 727 pgm_check_table[0x39] = &do_dat_exception; 728 pgm_check_table[0x3A] = &do_dat_exception; 729 pgm_check_table[0x3B] = &do_dat_exception; 730 #endif /* CONFIG_64BIT */ 731 pgm_check_table[0x15] = &operand_exception; 732 pgm_check_table[0x1C] = &space_switch_exception; 733 pgm_check_table[0x1D] = &hfp_sqrt_exception; 734 pgm_check_table[0x40] = &do_monitor_call; 735 pfault_irq_init(); 736 } 737