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 <linux/utsname.h> 35 #include <asm/system.h> 36 #include <asm/uaccess.h> 37 #include <asm/io.h> 38 #include <asm/atomic.h> 39 #include <asm/mathemu.h> 40 #include <asm/cpcmd.h> 41 #include <asm/s390_ext.h> 42 #include <asm/lowcore.h> 43 #include <asm/debug.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 /* 74 * For show_trace we have tree different stack to consider: 75 * - the panic stack which is used if the kernel stack has overflown 76 * - the asynchronous interrupt stack (cpu related) 77 * - the synchronous kernel stack (process related) 78 * The stack trace can start at any of the three stack and can potentially 79 * touch all of them. The order is: panic stack, async stack, sync stack. 80 */ 81 static unsigned long 82 __show_trace(unsigned long sp, unsigned long low, unsigned long high) 83 { 84 struct stack_frame *sf; 85 struct pt_regs *regs; 86 87 while (1) { 88 sp = sp & PSW_ADDR_INSN; 89 if (sp < low || sp > high - sizeof(*sf)) 90 return sp; 91 sf = (struct stack_frame *) sp; 92 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 93 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); 94 /* Follow the backchain. */ 95 while (1) { 96 low = sp; 97 sp = sf->back_chain & PSW_ADDR_INSN; 98 if (!sp) 99 break; 100 if (sp <= low || sp > high - sizeof(*sf)) 101 return sp; 102 sf = (struct stack_frame *) sp; 103 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 104 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); 105 } 106 /* Zero backchain detected, check for interrupt frame. */ 107 sp = (unsigned long) (sf + 1); 108 if (sp <= low || sp > high - sizeof(*regs)) 109 return sp; 110 regs = (struct pt_regs *) sp; 111 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); 112 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); 113 low = sp; 114 sp = regs->gprs[15]; 115 } 116 } 117 118 void show_trace(struct task_struct *task, unsigned long *stack) 119 { 120 register unsigned long __r15 asm ("15"); 121 unsigned long sp; 122 123 sp = (unsigned long) stack; 124 if (!sp) 125 sp = task ? task->thread.ksp : __r15; 126 printk("Call Trace:\n"); 127 #ifdef CONFIG_CHECK_STACK 128 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, 129 S390_lowcore.panic_stack); 130 #endif 131 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, 132 S390_lowcore.async_stack); 133 if (task) 134 __show_trace(sp, (unsigned long) task_stack_page(task), 135 (unsigned long) task_stack_page(task) + THREAD_SIZE); 136 else 137 __show_trace(sp, S390_lowcore.thread_info, 138 S390_lowcore.thread_info + THREAD_SIZE); 139 printk("\n"); 140 if (!task) 141 task = current; 142 debug_show_held_locks(task); 143 } 144 145 void show_stack(struct task_struct *task, unsigned long *sp) 146 { 147 register unsigned long * __r15 asm ("15"); 148 unsigned long *stack; 149 int i; 150 151 if (!sp) 152 stack = task ? (unsigned long *) task->thread.ksp : __r15; 153 else 154 stack = sp; 155 156 for (i = 0; i < kstack_depth_to_print; i++) { 157 if (((addr_t) stack & (THREAD_SIZE-1)) == 0) 158 break; 159 if (i && ((i * sizeof (long) % 32) == 0)) 160 printk("\n "); 161 printk("%p ", (void *)*stack++); 162 } 163 printk("\n"); 164 show_trace(task, sp); 165 } 166 167 /* 168 * The architecture-independent dump_stack generator 169 */ 170 void dump_stack(void) 171 { 172 printk("CPU: %d %s %s %.*s\n", 173 task_thread_info(current)->cpu, print_tainted(), 174 init_utsname()->release, 175 (int)strcspn(init_utsname()->version, " "), 176 init_utsname()->version); 177 printk("Process %s (pid: %d, task: %p, ksp: %p)\n", 178 current->comm, current->pid, current, 179 (void *) current->thread.ksp); 180 show_stack(NULL, NULL); 181 } 182 EXPORT_SYMBOL(dump_stack); 183 184 static inline int mask_bits(struct pt_regs *regs, unsigned long bits) 185 { 186 return (regs->psw.mask & bits) / ((~bits + 1) & bits); 187 } 188 189 void show_registers(struct pt_regs *regs) 190 { 191 char *mode; 192 193 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl"; 194 printk("%s PSW : %p %p", 195 mode, (void *) regs->psw.mask, 196 (void *) regs->psw.addr); 197 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); 198 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x " 199 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER), 200 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO), 201 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY), 202 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT), 203 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC), 204 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM)); 205 #ifdef CONFIG_64BIT 206 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS)); 207 #endif 208 printk("\n%s GPRS: " FOURLONG, mode, 209 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); 210 printk(" " FOURLONG, 211 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); 212 printk(" " FOURLONG, 213 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); 214 printk(" " FOURLONG, 215 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); 216 217 show_code(regs); 218 } 219 220 /* This is called from fs/proc/array.c */ 221 char *task_show_regs(struct task_struct *task, char *buffer) 222 { 223 struct pt_regs *regs; 224 225 regs = task_pt_regs(task); 226 buffer += sprintf(buffer, "task: %p, ksp: %p\n", 227 task, (void *)task->thread.ksp); 228 buffer += sprintf(buffer, "User PSW : %p %p\n", 229 (void *) regs->psw.mask, (void *)regs->psw.addr); 230 231 buffer += sprintf(buffer, "User GPRS: " FOURLONG, 232 regs->gprs[0], regs->gprs[1], 233 regs->gprs[2], regs->gprs[3]); 234 buffer += sprintf(buffer, " " FOURLONG, 235 regs->gprs[4], regs->gprs[5], 236 regs->gprs[6], regs->gprs[7]); 237 buffer += sprintf(buffer, " " FOURLONG, 238 regs->gprs[8], regs->gprs[9], 239 regs->gprs[10], regs->gprs[11]); 240 buffer += sprintf(buffer, " " FOURLONG, 241 regs->gprs[12], regs->gprs[13], 242 regs->gprs[14], regs->gprs[15]); 243 buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n", 244 task->thread.acrs[0], task->thread.acrs[1], 245 task->thread.acrs[2], task->thread.acrs[3]); 246 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 247 task->thread.acrs[4], task->thread.acrs[5], 248 task->thread.acrs[6], task->thread.acrs[7]); 249 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 250 task->thread.acrs[8], task->thread.acrs[9], 251 task->thread.acrs[10], task->thread.acrs[11]); 252 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 253 task->thread.acrs[12], task->thread.acrs[13], 254 task->thread.acrs[14], task->thread.acrs[15]); 255 return buffer; 256 } 257 258 static DEFINE_SPINLOCK(die_lock); 259 260 void die(const char * str, struct pt_regs * regs, long err) 261 { 262 static int die_counter; 263 264 oops_enter(); 265 debug_stop_all(); 266 console_verbose(); 267 spin_lock_irq(&die_lock); 268 bust_spinlocks(1); 269 printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); 270 #ifdef CONFIG_PREEMPT 271 printk("PREEMPT "); 272 #endif 273 #ifdef CONFIG_SMP 274 printk("SMP"); 275 #endif 276 printk("\n"); 277 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); 278 show_regs(regs); 279 bust_spinlocks(0); 280 add_taint(TAINT_DIE); 281 spin_unlock_irq(&die_lock); 282 if (in_interrupt()) 283 panic("Fatal exception in interrupt"); 284 if (panic_on_oops) 285 panic("Fatal exception: panic_on_oops"); 286 oops_exit(); 287 do_exit(SIGSEGV); 288 } 289 290 static void inline 291 report_user_fault(long interruption_code, struct pt_regs *regs) 292 { 293 #if defined(CONFIG_SYSCTL) 294 if (!sysctl_userprocess_debug) 295 return; 296 #endif 297 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG) 298 printk("User process fault: interruption code 0x%lX\n", 299 interruption_code); 300 show_regs(regs); 301 #endif 302 } 303 304 int is_valid_bugaddr(unsigned long addr) 305 { 306 return 1; 307 } 308 309 static void __kprobes inline do_trap(long interruption_code, int signr, 310 char *str, struct pt_regs *regs, 311 siginfo_t *info) 312 { 313 /* 314 * We got all needed information from the lowcore and can 315 * now safely switch on interrupts. 316 */ 317 if (regs->psw.mask & PSW_MASK_PSTATE) 318 local_irq_enable(); 319 320 if (notify_die(DIE_TRAP, str, regs, interruption_code, 321 interruption_code, signr) == NOTIFY_STOP) 322 return; 323 324 if (regs->psw.mask & PSW_MASK_PSTATE) { 325 struct task_struct *tsk = current; 326 327 tsk->thread.trap_no = interruption_code & 0xffff; 328 force_sig_info(signr, info, tsk); 329 report_user_fault(interruption_code, regs); 330 } else { 331 const struct exception_table_entry *fixup; 332 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 333 if (fixup) 334 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 335 else { 336 enum bug_trap_type btt; 337 338 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs); 339 if (btt == BUG_TRAP_TYPE_WARN) 340 return; 341 die(str, regs, interruption_code); 342 } 343 } 344 } 345 346 static inline void __user *get_check_address(struct pt_regs *regs) 347 { 348 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); 349 } 350 351 void __kprobes do_single_step(struct pt_regs *regs) 352 { 353 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, 354 SIGTRAP) == NOTIFY_STOP){ 355 return; 356 } 357 if ((current->ptrace & PT_PTRACED) != 0) 358 force_sig(SIGTRAP, current); 359 } 360 361 static void default_trap_handler(struct pt_regs * regs, long interruption_code) 362 { 363 if (regs->psw.mask & PSW_MASK_PSTATE) { 364 local_irq_enable(); 365 do_exit(SIGSEGV); 366 report_user_fault(interruption_code, regs); 367 } else 368 die("Unknown program exception", regs, interruption_code); 369 } 370 371 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ 372 static void name(struct pt_regs * regs, long interruption_code) \ 373 { \ 374 siginfo_t info; \ 375 info.si_signo = signr; \ 376 info.si_errno = 0; \ 377 info.si_code = sicode; \ 378 info.si_addr = siaddr; \ 379 do_trap(interruption_code, signr, str, regs, &info); \ 380 } 381 382 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, 383 ILL_ILLADR, get_check_address(regs)) 384 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, 385 ILL_ILLOPN, get_check_address(regs)) 386 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, 387 FPE_INTDIV, get_check_address(regs)) 388 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, 389 FPE_INTOVF, get_check_address(regs)) 390 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, 391 FPE_FLTOVF, get_check_address(regs)) 392 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, 393 FPE_FLTUND, get_check_address(regs)) 394 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, 395 FPE_FLTRES, get_check_address(regs)) 396 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, 397 FPE_FLTDIV, get_check_address(regs)) 398 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, 399 FPE_FLTINV, get_check_address(regs)) 400 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, 401 ILL_ILLOPN, get_check_address(regs)) 402 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, 403 ILL_PRVOPC, get_check_address(regs)) 404 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, 405 ILL_ILLOPN, get_check_address(regs)) 406 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, 407 ILL_ILLOPN, get_check_address(regs)) 408 409 static inline void 410 do_fp_trap(struct pt_regs *regs, void __user *location, 411 int fpc, long interruption_code) 412 { 413 siginfo_t si; 414 415 si.si_signo = SIGFPE; 416 si.si_errno = 0; 417 si.si_addr = location; 418 si.si_code = 0; 419 /* FPC[2] is Data Exception Code */ 420 if ((fpc & 0x00000300) == 0) { 421 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 422 if (fpc & 0x8000) /* invalid fp operation */ 423 si.si_code = FPE_FLTINV; 424 else if (fpc & 0x4000) /* div by 0 */ 425 si.si_code = FPE_FLTDIV; 426 else if (fpc & 0x2000) /* overflow */ 427 si.si_code = FPE_FLTOVF; 428 else if (fpc & 0x1000) /* underflow */ 429 si.si_code = FPE_FLTUND; 430 else if (fpc & 0x0800) /* inexact */ 431 si.si_code = FPE_FLTRES; 432 } 433 current->thread.ieee_instruction_pointer = (addr_t) location; 434 do_trap(interruption_code, SIGFPE, 435 "floating point exception", regs, &si); 436 } 437 438 static void illegal_op(struct pt_regs * regs, long interruption_code) 439 { 440 siginfo_t info; 441 __u8 opcode[6]; 442 __u16 __user *location; 443 int signal = 0; 444 445 location = get_check_address(regs); 446 447 /* 448 * We got all needed information from the lowcore and can 449 * now safely switch on interrupts. 450 */ 451 if (regs->psw.mask & PSW_MASK_PSTATE) 452 local_irq_enable(); 453 454 if (regs->psw.mask & PSW_MASK_PSTATE) { 455 if (get_user(*((__u16 *) opcode), (__u16 __user *) location)) 456 return; 457 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { 458 if (current->ptrace & PT_PTRACED) 459 force_sig(SIGTRAP, current); 460 else 461 signal = SIGILL; 462 #ifdef CONFIG_MATHEMU 463 } else if (opcode[0] == 0xb3) { 464 if (get_user(*((__u16 *) (opcode+2)), location+1)) 465 return; 466 signal = math_emu_b3(opcode, regs); 467 } else if (opcode[0] == 0xed) { 468 if (get_user(*((__u32 *) (opcode+2)), 469 (__u32 __user *)(location+1))) 470 return; 471 signal = math_emu_ed(opcode, regs); 472 } else if (*((__u16 *) opcode) == 0xb299) { 473 if (get_user(*((__u16 *) (opcode+2)), location+1)) 474 return; 475 signal = math_emu_srnm(opcode, regs); 476 } else if (*((__u16 *) opcode) == 0xb29c) { 477 if (get_user(*((__u16 *) (opcode+2)), location+1)) 478 return; 479 signal = math_emu_stfpc(opcode, regs); 480 } else if (*((__u16 *) opcode) == 0xb29d) { 481 if (get_user(*((__u16 *) (opcode+2)), location+1)) 482 return; 483 signal = math_emu_lfpc(opcode, regs); 484 #endif 485 } else 486 signal = SIGILL; 487 } else { 488 /* 489 * If we get an illegal op in kernel mode, send it through the 490 * kprobes notifier. If kprobes doesn't pick it up, SIGILL 491 */ 492 if (notify_die(DIE_BPT, "bpt", regs, interruption_code, 493 3, SIGTRAP) != NOTIFY_STOP) 494 signal = SIGILL; 495 } 496 497 #ifdef CONFIG_MATHEMU 498 if (signal == SIGFPE) 499 do_fp_trap(regs, location, 500 current->thread.fp_regs.fpc, interruption_code); 501 else if (signal == SIGSEGV) { 502 info.si_signo = signal; 503 info.si_errno = 0; 504 info.si_code = SEGV_MAPERR; 505 info.si_addr = (void __user *) location; 506 do_trap(interruption_code, signal, 507 "user address fault", regs, &info); 508 } else 509 #endif 510 if (signal) { 511 info.si_signo = signal; 512 info.si_errno = 0; 513 info.si_code = ILL_ILLOPC; 514 info.si_addr = (void __user *) location; 515 do_trap(interruption_code, signal, 516 "illegal operation", regs, &info); 517 } 518 } 519 520 521 #ifdef CONFIG_MATHEMU 522 asmlinkage void 523 specification_exception(struct pt_regs * regs, long interruption_code) 524 { 525 __u8 opcode[6]; 526 __u16 __user *location = NULL; 527 int signal = 0; 528 529 location = (__u16 __user *) get_check_address(regs); 530 531 /* 532 * We got all needed information from the lowcore and can 533 * now safely switch on interrupts. 534 */ 535 if (regs->psw.mask & PSW_MASK_PSTATE) 536 local_irq_enable(); 537 538 if (regs->psw.mask & PSW_MASK_PSTATE) { 539 get_user(*((__u16 *) opcode), location); 540 switch (opcode[0]) { 541 case 0x28: /* LDR Rx,Ry */ 542 signal = math_emu_ldr(opcode); 543 break; 544 case 0x38: /* LER Rx,Ry */ 545 signal = math_emu_ler(opcode); 546 break; 547 case 0x60: /* STD R,D(X,B) */ 548 get_user(*((__u16 *) (opcode+2)), location+1); 549 signal = math_emu_std(opcode, regs); 550 break; 551 case 0x68: /* LD R,D(X,B) */ 552 get_user(*((__u16 *) (opcode+2)), location+1); 553 signal = math_emu_ld(opcode, regs); 554 break; 555 case 0x70: /* STE R,D(X,B) */ 556 get_user(*((__u16 *) (opcode+2)), location+1); 557 signal = math_emu_ste(opcode, regs); 558 break; 559 case 0x78: /* LE R,D(X,B) */ 560 get_user(*((__u16 *) (opcode+2)), location+1); 561 signal = math_emu_le(opcode, regs); 562 break; 563 default: 564 signal = SIGILL; 565 break; 566 } 567 } else 568 signal = SIGILL; 569 570 if (signal == SIGFPE) 571 do_fp_trap(regs, location, 572 current->thread.fp_regs.fpc, interruption_code); 573 else if (signal) { 574 siginfo_t info; 575 info.si_signo = signal; 576 info.si_errno = 0; 577 info.si_code = ILL_ILLOPN; 578 info.si_addr = location; 579 do_trap(interruption_code, signal, 580 "specification exception", regs, &info); 581 } 582 } 583 #else 584 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 585 ILL_ILLOPN, get_check_address(regs)); 586 #endif 587 588 static void data_exception(struct pt_regs * regs, long interruption_code) 589 { 590 __u16 __user *location; 591 int signal = 0; 592 593 location = get_check_address(regs); 594 595 /* 596 * We got all needed information from the lowcore and can 597 * now safely switch on interrupts. 598 */ 599 if (regs->psw.mask & PSW_MASK_PSTATE) 600 local_irq_enable(); 601 602 if (MACHINE_HAS_IEEE) 603 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc)); 604 605 #ifdef CONFIG_MATHEMU 606 else if (regs->psw.mask & PSW_MASK_PSTATE) { 607 __u8 opcode[6]; 608 get_user(*((__u16 *) opcode), location); 609 switch (opcode[0]) { 610 case 0x28: /* LDR Rx,Ry */ 611 signal = math_emu_ldr(opcode); 612 break; 613 case 0x38: /* LER Rx,Ry */ 614 signal = math_emu_ler(opcode); 615 break; 616 case 0x60: /* STD R,D(X,B) */ 617 get_user(*((__u16 *) (opcode+2)), location+1); 618 signal = math_emu_std(opcode, regs); 619 break; 620 case 0x68: /* LD R,D(X,B) */ 621 get_user(*((__u16 *) (opcode+2)), location+1); 622 signal = math_emu_ld(opcode, regs); 623 break; 624 case 0x70: /* STE R,D(X,B) */ 625 get_user(*((__u16 *) (opcode+2)), location+1); 626 signal = math_emu_ste(opcode, regs); 627 break; 628 case 0x78: /* LE R,D(X,B) */ 629 get_user(*((__u16 *) (opcode+2)), location+1); 630 signal = math_emu_le(opcode, regs); 631 break; 632 case 0xb3: 633 get_user(*((__u16 *) (opcode+2)), location+1); 634 signal = math_emu_b3(opcode, regs); 635 break; 636 case 0xed: 637 get_user(*((__u32 *) (opcode+2)), 638 (__u32 __user *)(location+1)); 639 signal = math_emu_ed(opcode, regs); 640 break; 641 case 0xb2: 642 if (opcode[1] == 0x99) { 643 get_user(*((__u16 *) (opcode+2)), location+1); 644 signal = math_emu_srnm(opcode, regs); 645 } else if (opcode[1] == 0x9c) { 646 get_user(*((__u16 *) (opcode+2)), location+1); 647 signal = math_emu_stfpc(opcode, regs); 648 } else if (opcode[1] == 0x9d) { 649 get_user(*((__u16 *) (opcode+2)), location+1); 650 signal = math_emu_lfpc(opcode, regs); 651 } else 652 signal = SIGILL; 653 break; 654 default: 655 signal = SIGILL; 656 break; 657 } 658 } 659 #endif 660 if (current->thread.fp_regs.fpc & FPC_DXC_MASK) 661 signal = SIGFPE; 662 else 663 signal = SIGILL; 664 if (signal == SIGFPE) 665 do_fp_trap(regs, location, 666 current->thread.fp_regs.fpc, interruption_code); 667 else if (signal) { 668 siginfo_t info; 669 info.si_signo = signal; 670 info.si_errno = 0; 671 info.si_code = ILL_ILLOPN; 672 info.si_addr = location; 673 do_trap(interruption_code, signal, 674 "data exception", regs, &info); 675 } 676 } 677 678 static void space_switch_exception(struct pt_regs * regs, long int_code) 679 { 680 siginfo_t info; 681 682 /* Set user psw back to home space mode. */ 683 if (regs->psw.mask & PSW_MASK_PSTATE) 684 regs->psw.mask |= PSW_ASC_HOME; 685 /* Send SIGILL. */ 686 info.si_signo = SIGILL; 687 info.si_errno = 0; 688 info.si_code = ILL_PRVOPC; 689 info.si_addr = get_check_address(regs); 690 do_trap(int_code, SIGILL, "space switch event", regs, &info); 691 } 692 693 asmlinkage void kernel_stack_overflow(struct pt_regs * regs) 694 { 695 bust_spinlocks(1); 696 printk("Kernel stack overflow.\n"); 697 show_regs(regs); 698 bust_spinlocks(0); 699 panic("Corrupt kernel stack, can't continue."); 700 } 701 702 /* init is done in lowcore.S and head.S */ 703 704 void __init trap_init(void) 705 { 706 int i; 707 708 for (i = 0; i < 128; i++) 709 pgm_check_table[i] = &default_trap_handler; 710 pgm_check_table[1] = &illegal_op; 711 pgm_check_table[2] = &privileged_op; 712 pgm_check_table[3] = &execute_exception; 713 pgm_check_table[4] = &do_protection_exception; 714 pgm_check_table[5] = &addressing_exception; 715 pgm_check_table[6] = &specification_exception; 716 pgm_check_table[7] = &data_exception; 717 pgm_check_table[8] = &overflow_exception; 718 pgm_check_table[9] = ÷_exception; 719 pgm_check_table[0x0A] = &overflow_exception; 720 pgm_check_table[0x0B] = ÷_exception; 721 pgm_check_table[0x0C] = &hfp_overflow_exception; 722 pgm_check_table[0x0D] = &hfp_underflow_exception; 723 pgm_check_table[0x0E] = &hfp_significance_exception; 724 pgm_check_table[0x0F] = &hfp_divide_exception; 725 pgm_check_table[0x10] = &do_dat_exception; 726 pgm_check_table[0x11] = &do_dat_exception; 727 pgm_check_table[0x12] = &translation_exception; 728 pgm_check_table[0x13] = &special_op_exception; 729 #ifdef CONFIG_64BIT 730 pgm_check_table[0x38] = &do_dat_exception; 731 pgm_check_table[0x39] = &do_dat_exception; 732 pgm_check_table[0x3A] = &do_dat_exception; 733 pgm_check_table[0x3B] = &do_dat_exception; 734 #endif /* CONFIG_64BIT */ 735 pgm_check_table[0x15] = &operand_exception; 736 pgm_check_table[0x1C] = &space_switch_exception; 737 pgm_check_table[0x1D] = &hfp_sqrt_exception; 738 pgm_check_table[0x40] = &do_monitor_call; 739 pfault_irq_init(); 740 } 741