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 oops_enter(); 257 debug_stop_all(); 258 console_verbose(); 259 spin_lock_irq(&die_lock); 260 bust_spinlocks(1); 261 printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); 262 print_modules(); 263 show_regs(regs); 264 bust_spinlocks(0); 265 spin_unlock_irq(&die_lock); 266 if (in_interrupt()) 267 panic("Fatal exception in interrupt"); 268 if (panic_on_oops) 269 panic("Fatal exception: panic_on_oops"); 270 oops_exit(); 271 do_exit(SIGSEGV); 272 } 273 274 static void inline 275 report_user_fault(long interruption_code, struct pt_regs *regs) 276 { 277 #if defined(CONFIG_SYSCTL) 278 if (!sysctl_userprocess_debug) 279 return; 280 #endif 281 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG) 282 printk("User process fault: interruption code 0x%lX\n", 283 interruption_code); 284 show_regs(regs); 285 #endif 286 } 287 288 int is_valid_bugaddr(unsigned long addr) 289 { 290 return 1; 291 } 292 293 static void __kprobes inline do_trap(long interruption_code, int signr, 294 char *str, struct pt_regs *regs, 295 siginfo_t *info) 296 { 297 /* 298 * We got all needed information from the lowcore and can 299 * now safely switch on interrupts. 300 */ 301 if (regs->psw.mask & PSW_MASK_PSTATE) 302 local_irq_enable(); 303 304 if (notify_die(DIE_TRAP, str, regs, interruption_code, 305 interruption_code, signr) == NOTIFY_STOP) 306 return; 307 308 if (regs->psw.mask & PSW_MASK_PSTATE) { 309 struct task_struct *tsk = current; 310 311 tsk->thread.trap_no = interruption_code & 0xffff; 312 force_sig_info(signr, info, tsk); 313 report_user_fault(interruption_code, regs); 314 } else { 315 const struct exception_table_entry *fixup; 316 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 317 if (fixup) 318 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 319 else { 320 enum bug_trap_type btt; 321 322 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN); 323 if (btt == BUG_TRAP_TYPE_WARN) 324 return; 325 die(str, regs, interruption_code); 326 } 327 } 328 } 329 330 static inline void __user *get_check_address(struct pt_regs *regs) 331 { 332 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); 333 } 334 335 void __kprobes do_single_step(struct pt_regs *regs) 336 { 337 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, 338 SIGTRAP) == NOTIFY_STOP){ 339 return; 340 } 341 if ((current->ptrace & PT_PTRACED) != 0) 342 force_sig(SIGTRAP, current); 343 } 344 345 static void default_trap_handler(struct pt_regs * regs, long interruption_code) 346 { 347 if (regs->psw.mask & PSW_MASK_PSTATE) { 348 local_irq_enable(); 349 do_exit(SIGSEGV); 350 report_user_fault(interruption_code, regs); 351 } else 352 die("Unknown program exception", regs, interruption_code); 353 } 354 355 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ 356 static void name(struct pt_regs * regs, long interruption_code) \ 357 { \ 358 siginfo_t info; \ 359 info.si_signo = signr; \ 360 info.si_errno = 0; \ 361 info.si_code = sicode; \ 362 info.si_addr = siaddr; \ 363 do_trap(interruption_code, signr, str, regs, &info); \ 364 } 365 366 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, 367 ILL_ILLADR, get_check_address(regs)) 368 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, 369 ILL_ILLOPN, get_check_address(regs)) 370 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, 371 FPE_INTDIV, get_check_address(regs)) 372 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, 373 FPE_INTOVF, get_check_address(regs)) 374 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, 375 FPE_FLTOVF, get_check_address(regs)) 376 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, 377 FPE_FLTUND, get_check_address(regs)) 378 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, 379 FPE_FLTRES, get_check_address(regs)) 380 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, 381 FPE_FLTDIV, get_check_address(regs)) 382 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, 383 FPE_FLTINV, get_check_address(regs)) 384 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, 385 ILL_ILLOPN, get_check_address(regs)) 386 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, 387 ILL_PRVOPC, get_check_address(regs)) 388 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, 389 ILL_ILLOPN, get_check_address(regs)) 390 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, 391 ILL_ILLOPN, get_check_address(regs)) 392 393 static inline void 394 do_fp_trap(struct pt_regs *regs, void __user *location, 395 int fpc, long interruption_code) 396 { 397 siginfo_t si; 398 399 si.si_signo = SIGFPE; 400 si.si_errno = 0; 401 si.si_addr = location; 402 si.si_code = 0; 403 /* FPC[2] is Data Exception Code */ 404 if ((fpc & 0x00000300) == 0) { 405 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 406 if (fpc & 0x8000) /* invalid fp operation */ 407 si.si_code = FPE_FLTINV; 408 else if (fpc & 0x4000) /* div by 0 */ 409 si.si_code = FPE_FLTDIV; 410 else if (fpc & 0x2000) /* overflow */ 411 si.si_code = FPE_FLTOVF; 412 else if (fpc & 0x1000) /* underflow */ 413 si.si_code = FPE_FLTUND; 414 else if (fpc & 0x0800) /* inexact */ 415 si.si_code = FPE_FLTRES; 416 } 417 current->thread.ieee_instruction_pointer = (addr_t) location; 418 do_trap(interruption_code, SIGFPE, 419 "floating point exception", regs, &si); 420 } 421 422 static void illegal_op(struct pt_regs * regs, long interruption_code) 423 { 424 siginfo_t info; 425 __u8 opcode[6]; 426 __u16 __user *location; 427 int signal = 0; 428 429 location = get_check_address(regs); 430 431 /* 432 * We got all needed information from the lowcore and can 433 * now safely switch on interrupts. 434 */ 435 if (regs->psw.mask & PSW_MASK_PSTATE) 436 local_irq_enable(); 437 438 if (regs->psw.mask & PSW_MASK_PSTATE) { 439 if (get_user(*((__u16 *) opcode), (__u16 __user *) location)) 440 return; 441 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { 442 if (current->ptrace & PT_PTRACED) 443 force_sig(SIGTRAP, current); 444 else 445 signal = SIGILL; 446 #ifdef CONFIG_MATHEMU 447 } else if (opcode[0] == 0xb3) { 448 if (get_user(*((__u16 *) (opcode+2)), location+1)) 449 return; 450 signal = math_emu_b3(opcode, regs); 451 } else if (opcode[0] == 0xed) { 452 if (get_user(*((__u32 *) (opcode+2)), 453 (__u32 __user *)(location+1))) 454 return; 455 signal = math_emu_ed(opcode, regs); 456 } else if (*((__u16 *) opcode) == 0xb299) { 457 if (get_user(*((__u16 *) (opcode+2)), location+1)) 458 return; 459 signal = math_emu_srnm(opcode, regs); 460 } else if (*((__u16 *) opcode) == 0xb29c) { 461 if (get_user(*((__u16 *) (opcode+2)), location+1)) 462 return; 463 signal = math_emu_stfpc(opcode, regs); 464 } else if (*((__u16 *) opcode) == 0xb29d) { 465 if (get_user(*((__u16 *) (opcode+2)), location+1)) 466 return; 467 signal = math_emu_lfpc(opcode, regs); 468 #endif 469 } else 470 signal = SIGILL; 471 } else { 472 /* 473 * If we get an illegal op in kernel mode, send it through the 474 * kprobes notifier. If kprobes doesn't pick it up, SIGILL 475 */ 476 if (notify_die(DIE_BPT, "bpt", regs, interruption_code, 477 3, SIGTRAP) != NOTIFY_STOP) 478 signal = SIGILL; 479 } 480 481 #ifdef CONFIG_MATHEMU 482 if (signal == SIGFPE) 483 do_fp_trap(regs, location, 484 current->thread.fp_regs.fpc, interruption_code); 485 else if (signal == SIGSEGV) { 486 info.si_signo = signal; 487 info.si_errno = 0; 488 info.si_code = SEGV_MAPERR; 489 info.si_addr = (void __user *) location; 490 do_trap(interruption_code, signal, 491 "user address fault", regs, &info); 492 } else 493 #endif 494 if (signal) { 495 info.si_signo = signal; 496 info.si_errno = 0; 497 info.si_code = ILL_ILLOPC; 498 info.si_addr = (void __user *) location; 499 do_trap(interruption_code, signal, 500 "illegal operation", regs, &info); 501 } 502 } 503 504 505 #ifdef CONFIG_MATHEMU 506 asmlinkage void 507 specification_exception(struct pt_regs * regs, long interruption_code) 508 { 509 __u8 opcode[6]; 510 __u16 __user *location = NULL; 511 int signal = 0; 512 513 location = (__u16 __user *) get_check_address(regs); 514 515 /* 516 * We got all needed information from the lowcore and can 517 * now safely switch on interrupts. 518 */ 519 if (regs->psw.mask & PSW_MASK_PSTATE) 520 local_irq_enable(); 521 522 if (regs->psw.mask & PSW_MASK_PSTATE) { 523 get_user(*((__u16 *) opcode), location); 524 switch (opcode[0]) { 525 case 0x28: /* LDR Rx,Ry */ 526 signal = math_emu_ldr(opcode); 527 break; 528 case 0x38: /* LER Rx,Ry */ 529 signal = math_emu_ler(opcode); 530 break; 531 case 0x60: /* STD R,D(X,B) */ 532 get_user(*((__u16 *) (opcode+2)), location+1); 533 signal = math_emu_std(opcode, regs); 534 break; 535 case 0x68: /* LD R,D(X,B) */ 536 get_user(*((__u16 *) (opcode+2)), location+1); 537 signal = math_emu_ld(opcode, regs); 538 break; 539 case 0x70: /* STE R,D(X,B) */ 540 get_user(*((__u16 *) (opcode+2)), location+1); 541 signal = math_emu_ste(opcode, regs); 542 break; 543 case 0x78: /* LE R,D(X,B) */ 544 get_user(*((__u16 *) (opcode+2)), location+1); 545 signal = math_emu_le(opcode, regs); 546 break; 547 default: 548 signal = SIGILL; 549 break; 550 } 551 } else 552 signal = SIGILL; 553 554 if (signal == SIGFPE) 555 do_fp_trap(regs, location, 556 current->thread.fp_regs.fpc, interruption_code); 557 else if (signal) { 558 siginfo_t info; 559 info.si_signo = signal; 560 info.si_errno = 0; 561 info.si_code = ILL_ILLOPN; 562 info.si_addr = location; 563 do_trap(interruption_code, signal, 564 "specification exception", regs, &info); 565 } 566 } 567 #else 568 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 569 ILL_ILLOPN, get_check_address(regs)); 570 #endif 571 572 static void data_exception(struct pt_regs * regs, long interruption_code) 573 { 574 __u16 __user *location; 575 int signal = 0; 576 577 location = get_check_address(regs); 578 579 /* 580 * We got all needed information from the lowcore and can 581 * now safely switch on interrupts. 582 */ 583 if (regs->psw.mask & PSW_MASK_PSTATE) 584 local_irq_enable(); 585 586 if (MACHINE_HAS_IEEE) 587 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc)); 588 589 #ifdef CONFIG_MATHEMU 590 else if (regs->psw.mask & PSW_MASK_PSTATE) { 591 __u8 opcode[6]; 592 get_user(*((__u16 *) opcode), location); 593 switch (opcode[0]) { 594 case 0x28: /* LDR Rx,Ry */ 595 signal = math_emu_ldr(opcode); 596 break; 597 case 0x38: /* LER Rx,Ry */ 598 signal = math_emu_ler(opcode); 599 break; 600 case 0x60: /* STD R,D(X,B) */ 601 get_user(*((__u16 *) (opcode+2)), location+1); 602 signal = math_emu_std(opcode, regs); 603 break; 604 case 0x68: /* LD R,D(X,B) */ 605 get_user(*((__u16 *) (opcode+2)), location+1); 606 signal = math_emu_ld(opcode, regs); 607 break; 608 case 0x70: /* STE R,D(X,B) */ 609 get_user(*((__u16 *) (opcode+2)), location+1); 610 signal = math_emu_ste(opcode, regs); 611 break; 612 case 0x78: /* LE R,D(X,B) */ 613 get_user(*((__u16 *) (opcode+2)), location+1); 614 signal = math_emu_le(opcode, regs); 615 break; 616 case 0xb3: 617 get_user(*((__u16 *) (opcode+2)), location+1); 618 signal = math_emu_b3(opcode, regs); 619 break; 620 case 0xed: 621 get_user(*((__u32 *) (opcode+2)), 622 (__u32 __user *)(location+1)); 623 signal = math_emu_ed(opcode, regs); 624 break; 625 case 0xb2: 626 if (opcode[1] == 0x99) { 627 get_user(*((__u16 *) (opcode+2)), location+1); 628 signal = math_emu_srnm(opcode, regs); 629 } else if (opcode[1] == 0x9c) { 630 get_user(*((__u16 *) (opcode+2)), location+1); 631 signal = math_emu_stfpc(opcode, regs); 632 } else if (opcode[1] == 0x9d) { 633 get_user(*((__u16 *) (opcode+2)), location+1); 634 signal = math_emu_lfpc(opcode, regs); 635 } else 636 signal = SIGILL; 637 break; 638 default: 639 signal = SIGILL; 640 break; 641 } 642 } 643 #endif 644 if (current->thread.fp_regs.fpc & FPC_DXC_MASK) 645 signal = SIGFPE; 646 else 647 signal = SIGILL; 648 if (signal == SIGFPE) 649 do_fp_trap(regs, location, 650 current->thread.fp_regs.fpc, interruption_code); 651 else if (signal) { 652 siginfo_t info; 653 info.si_signo = signal; 654 info.si_errno = 0; 655 info.si_code = ILL_ILLOPN; 656 info.si_addr = location; 657 do_trap(interruption_code, signal, 658 "data exception", regs, &info); 659 } 660 } 661 662 static void space_switch_exception(struct pt_regs * regs, long int_code) 663 { 664 siginfo_t info; 665 666 /* Set user psw back to home space mode. */ 667 if (regs->psw.mask & PSW_MASK_PSTATE) 668 regs->psw.mask |= PSW_ASC_HOME; 669 /* Send SIGILL. */ 670 info.si_signo = SIGILL; 671 info.si_errno = 0; 672 info.si_code = ILL_PRVOPC; 673 info.si_addr = get_check_address(regs); 674 do_trap(int_code, SIGILL, "space switch event", regs, &info); 675 } 676 677 asmlinkage void kernel_stack_overflow(struct pt_regs * regs) 678 { 679 bust_spinlocks(1); 680 printk("Kernel stack overflow.\n"); 681 show_regs(regs); 682 bust_spinlocks(0); 683 panic("Corrupt kernel stack, can't continue."); 684 } 685 686 /* init is done in lowcore.S and head.S */ 687 688 void __init trap_init(void) 689 { 690 int i; 691 692 for (i = 0; i < 128; i++) 693 pgm_check_table[i] = &default_trap_handler; 694 pgm_check_table[1] = &illegal_op; 695 pgm_check_table[2] = &privileged_op; 696 pgm_check_table[3] = &execute_exception; 697 pgm_check_table[4] = &do_protection_exception; 698 pgm_check_table[5] = &addressing_exception; 699 pgm_check_table[6] = &specification_exception; 700 pgm_check_table[7] = &data_exception; 701 pgm_check_table[8] = &overflow_exception; 702 pgm_check_table[9] = ÷_exception; 703 pgm_check_table[0x0A] = &overflow_exception; 704 pgm_check_table[0x0B] = ÷_exception; 705 pgm_check_table[0x0C] = &hfp_overflow_exception; 706 pgm_check_table[0x0D] = &hfp_underflow_exception; 707 pgm_check_table[0x0E] = &hfp_significance_exception; 708 pgm_check_table[0x0F] = &hfp_divide_exception; 709 pgm_check_table[0x10] = &do_dat_exception; 710 pgm_check_table[0x11] = &do_dat_exception; 711 pgm_check_table[0x12] = &translation_exception; 712 pgm_check_table[0x13] = &special_op_exception; 713 #ifdef CONFIG_64BIT 714 pgm_check_table[0x38] = &do_dat_exception; 715 pgm_check_table[0x39] = &do_dat_exception; 716 pgm_check_table[0x3A] = &do_dat_exception; 717 pgm_check_table[0x3B] = &do_dat_exception; 718 #endif /* CONFIG_64BIT */ 719 pgm_check_table[0x15] = &operand_exception; 720 pgm_check_table[0x1C] = &space_switch_exception; 721 pgm_check_table[0x1D] = &hfp_sqrt_exception; 722 pgm_check_table[0x40] = &do_monitor_call; 723 pfault_irq_init(); 724 } 725