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