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/tracehook.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/seq_file.h> 28 #include <linux/delay.h> 29 #include <linux/module.h> 30 #include <linux/kdebug.h> 31 #include <linux/kallsyms.h> 32 #include <linux/reboot.h> 33 #include <linux/kprobes.h> 34 #include <linux/bug.h> 35 #include <linux/utsname.h> 36 #include <asm/system.h> 37 #include <asm/uaccess.h> 38 #include <asm/io.h> 39 #include <asm/atomic.h> 40 #include <asm/mathemu.h> 41 #include <asm/cpcmd.h> 42 #include <asm/s390_ext.h> 43 #include <asm/lowcore.h> 44 #include <asm/debug.h> 45 #include "entry.h" 46 47 pgm_check_handler_t *pgm_check_table[128]; 48 49 int show_unhandled_signals; 50 51 extern pgm_check_handler_t do_protection_exception; 52 extern pgm_check_handler_t do_dat_exception; 53 extern pgm_check_handler_t do_asce_exception; 54 55 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; }) 56 57 #ifndef CONFIG_64BIT 58 #define LONG "%08lx " 59 #define FOURLONG "%08lx %08lx %08lx %08lx\n" 60 static int kstack_depth_to_print = 12; 61 #else /* CONFIG_64BIT */ 62 #define LONG "%016lx " 63 #define FOURLONG "%016lx %016lx %016lx %016lx\n" 64 static int kstack_depth_to_print = 20; 65 #endif /* CONFIG_64BIT */ 66 67 /* 68 * For show_trace we have tree different stack to consider: 69 * - the panic stack which is used if the kernel stack has overflown 70 * - the asynchronous interrupt stack (cpu related) 71 * - the synchronous kernel stack (process related) 72 * The stack trace can start at any of the three stack and can potentially 73 * touch all of them. The order is: panic stack, async stack, sync stack. 74 */ 75 static unsigned long 76 __show_trace(unsigned long sp, unsigned long low, unsigned long high) 77 { 78 struct stack_frame *sf; 79 struct pt_regs *regs; 80 81 while (1) { 82 sp = sp & PSW_ADDR_INSN; 83 if (sp < low || sp > high - sizeof(*sf)) 84 return sp; 85 sf = (struct stack_frame *) sp; 86 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 87 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); 88 /* Follow the backchain. */ 89 while (1) { 90 low = sp; 91 sp = sf->back_chain & PSW_ADDR_INSN; 92 if (!sp) 93 break; 94 if (sp <= low || sp > high - sizeof(*sf)) 95 return sp; 96 sf = (struct stack_frame *) sp; 97 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 98 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); 99 } 100 /* Zero backchain detected, check for interrupt frame. */ 101 sp = (unsigned long) (sf + 1); 102 if (sp <= low || sp > high - sizeof(*regs)) 103 return sp; 104 regs = (struct pt_regs *) sp; 105 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); 106 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); 107 low = sp; 108 sp = regs->gprs[15]; 109 } 110 } 111 112 static void show_trace(struct task_struct *task, unsigned long *stack) 113 { 114 register unsigned long __r15 asm ("15"); 115 unsigned long sp; 116 117 sp = (unsigned long) stack; 118 if (!sp) 119 sp = task ? task->thread.ksp : __r15; 120 printk("Call Trace:\n"); 121 #ifdef CONFIG_CHECK_STACK 122 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, 123 S390_lowcore.panic_stack); 124 #endif 125 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, 126 S390_lowcore.async_stack); 127 if (task) 128 __show_trace(sp, (unsigned long) task_stack_page(task), 129 (unsigned long) task_stack_page(task) + THREAD_SIZE); 130 else 131 __show_trace(sp, S390_lowcore.thread_info, 132 S390_lowcore.thread_info + THREAD_SIZE); 133 if (!task) 134 task = current; 135 debug_show_held_locks(task); 136 } 137 138 void show_stack(struct task_struct *task, unsigned long *sp) 139 { 140 register unsigned long * __r15 asm ("15"); 141 unsigned long *stack; 142 int i; 143 144 if (!sp) 145 stack = task ? (unsigned long *) task->thread.ksp : __r15; 146 else 147 stack = sp; 148 149 for (i = 0; i < kstack_depth_to_print; i++) { 150 if (((addr_t) stack & (THREAD_SIZE-1)) == 0) 151 break; 152 if (i && ((i * sizeof (long) % 32) == 0)) 153 printk("\n "); 154 printk(LONG, *stack++); 155 } 156 printk("\n"); 157 show_trace(task, sp); 158 } 159 160 static void show_last_breaking_event(struct pt_regs *regs) 161 { 162 #ifdef CONFIG_64BIT 163 printk("Last Breaking-Event-Address:\n"); 164 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN); 165 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN); 166 #endif 167 } 168 169 /* 170 * The architecture-independent dump_stack generator 171 */ 172 void dump_stack(void) 173 { 174 printk("CPU: %d %s %s %.*s\n", 175 task_thread_info(current)->cpu, print_tainted(), 176 init_utsname()->release, 177 (int)strcspn(init_utsname()->version, " "), 178 init_utsname()->version); 179 printk("Process %s (pid: %d, task: %p, ksp: %p)\n", 180 current->comm, current->pid, current, 181 (void *) current->thread.ksp); 182 show_stack(NULL, NULL); 183 } 184 EXPORT_SYMBOL(dump_stack); 185 186 static inline int mask_bits(struct pt_regs *regs, unsigned long bits) 187 { 188 return (regs->psw.mask & bits) / ((~bits + 1) & bits); 189 } 190 191 void show_registers(struct pt_regs *regs) 192 { 193 char *mode; 194 195 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl"; 196 printk("%s PSW : %p %p", 197 mode, (void *) regs->psw.mask, 198 (void *) regs->psw.addr); 199 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); 200 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x " 201 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER), 202 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO), 203 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY), 204 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT), 205 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC), 206 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM)); 207 #ifdef CONFIG_64BIT 208 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS)); 209 #endif 210 printk("\n%s GPRS: " FOURLONG, mode, 211 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); 212 printk(" " FOURLONG, 213 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); 214 printk(" " FOURLONG, 215 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); 216 printk(" " FOURLONG, 217 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); 218 219 show_code(regs); 220 } 221 222 void show_regs(struct pt_regs *regs) 223 { 224 print_modules(); 225 printk("CPU: %d %s %s %.*s\n", 226 task_thread_info(current)->cpu, print_tainted(), 227 init_utsname()->release, 228 (int)strcspn(init_utsname()->version, " "), 229 init_utsname()->version); 230 printk("Process %s (pid: %d, task: %p, ksp: %p)\n", 231 current->comm, current->pid, current, 232 (void *) current->thread.ksp); 233 show_registers(regs); 234 /* Show stack backtrace if pt_regs is from kernel mode */ 235 if (!(regs->psw.mask & PSW_MASK_PSTATE)) 236 show_trace(NULL, (unsigned long *) regs->gprs[15]); 237 show_last_breaking_event(regs); 238 } 239 240 /* This is called from fs/proc/array.c */ 241 void task_show_regs(struct seq_file *m, struct task_struct *task) 242 { 243 struct pt_regs *regs; 244 245 regs = task_pt_regs(task); 246 seq_printf(m, "task: %p, ksp: %p\n", 247 task, (void *)task->thread.ksp); 248 seq_printf(m, "User PSW : %p %p\n", 249 (void *) regs->psw.mask, (void *)regs->psw.addr); 250 251 seq_printf(m, "User GPRS: " FOURLONG, 252 regs->gprs[0], regs->gprs[1], 253 regs->gprs[2], regs->gprs[3]); 254 seq_printf(m, " " FOURLONG, 255 regs->gprs[4], regs->gprs[5], 256 regs->gprs[6], regs->gprs[7]); 257 seq_printf(m, " " FOURLONG, 258 regs->gprs[8], regs->gprs[9], 259 regs->gprs[10], regs->gprs[11]); 260 seq_printf(m, " " FOURLONG, 261 regs->gprs[12], regs->gprs[13], 262 regs->gprs[14], regs->gprs[15]); 263 seq_printf(m, "User ACRS: %08x %08x %08x %08x\n", 264 task->thread.acrs[0], task->thread.acrs[1], 265 task->thread.acrs[2], task->thread.acrs[3]); 266 seq_printf(m, " %08x %08x %08x %08x\n", 267 task->thread.acrs[4], task->thread.acrs[5], 268 task->thread.acrs[6], task->thread.acrs[7]); 269 seq_printf(m, " %08x %08x %08x %08x\n", 270 task->thread.acrs[8], task->thread.acrs[9], 271 task->thread.acrs[10], task->thread.acrs[11]); 272 seq_printf(m, " %08x %08x %08x %08x\n", 273 task->thread.acrs[12], task->thread.acrs[13], 274 task->thread.acrs[14], task->thread.acrs[15]); 275 } 276 277 static DEFINE_SPINLOCK(die_lock); 278 279 void die(const char * str, struct pt_regs * regs, long err) 280 { 281 static int die_counter; 282 283 oops_enter(); 284 debug_stop_all(); 285 console_verbose(); 286 spin_lock_irq(&die_lock); 287 bust_spinlocks(1); 288 printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); 289 #ifdef CONFIG_PREEMPT 290 printk("PREEMPT "); 291 #endif 292 #ifdef CONFIG_SMP 293 printk("SMP "); 294 #endif 295 #ifdef CONFIG_DEBUG_PAGEALLOC 296 printk("DEBUG_PAGEALLOC"); 297 #endif 298 printk("\n"); 299 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); 300 show_regs(regs); 301 bust_spinlocks(0); 302 add_taint(TAINT_DIE); 303 spin_unlock_irq(&die_lock); 304 if (in_interrupt()) 305 panic("Fatal exception in interrupt"); 306 if (panic_on_oops) 307 panic("Fatal exception: panic_on_oops"); 308 oops_exit(); 309 do_exit(SIGSEGV); 310 } 311 312 static void inline report_user_fault(struct pt_regs *regs, long int_code, 313 int signr) 314 { 315 if ((task_pid_nr(current) > 1) && !show_unhandled_signals) 316 return; 317 if (!unhandled_signal(current, signr)) 318 return; 319 if (!printk_ratelimit()) 320 return; 321 printk("User process fault: interruption code 0x%lX ", int_code); 322 print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN); 323 printk("\n"); 324 show_regs(regs); 325 } 326 327 int is_valid_bugaddr(unsigned long addr) 328 { 329 return 1; 330 } 331 332 static inline void __kprobes do_trap(long pgm_int_code, int signr, char *str, 333 struct pt_regs *regs, siginfo_t *info) 334 { 335 if (notify_die(DIE_TRAP, str, regs, pgm_int_code, 336 pgm_int_code, signr) == NOTIFY_STOP) 337 return; 338 339 if (regs->psw.mask & PSW_MASK_PSTATE) { 340 struct task_struct *tsk = current; 341 342 tsk->thread.trap_no = pgm_int_code & 0xffff; 343 force_sig_info(signr, info, tsk); 344 report_user_fault(regs, pgm_int_code, signr); 345 } else { 346 const struct exception_table_entry *fixup; 347 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 348 if (fixup) 349 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 350 else { 351 enum bug_trap_type btt; 352 353 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs); 354 if (btt == BUG_TRAP_TYPE_WARN) 355 return; 356 die(str, regs, pgm_int_code); 357 } 358 } 359 } 360 361 static inline void __user *get_psw_address(struct pt_regs *regs, 362 long pgm_int_code) 363 { 364 return (void __user *) 365 ((regs->psw.addr - (pgm_int_code >> 16)) & PSW_ADDR_INSN); 366 } 367 368 void __kprobes do_per_trap(struct pt_regs *regs) 369 { 370 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP) 371 return; 372 if (tracehook_consider_fatal_signal(current, SIGTRAP)) 373 force_sig(SIGTRAP, current); 374 } 375 376 static void default_trap_handler(struct pt_regs *regs, long pgm_int_code, 377 unsigned long trans_exc_code) 378 { 379 if (regs->psw.mask & PSW_MASK_PSTATE) { 380 report_user_fault(regs, pgm_int_code, SIGSEGV); 381 do_exit(SIGSEGV); 382 } else 383 die("Unknown program exception", regs, pgm_int_code); 384 } 385 386 #define DO_ERROR_INFO(name, signr, sicode, str) \ 387 static void name(struct pt_regs *regs, long pgm_int_code, \ 388 unsigned long trans_exc_code) \ 389 { \ 390 siginfo_t info; \ 391 info.si_signo = signr; \ 392 info.si_errno = 0; \ 393 info.si_code = sicode; \ 394 info.si_addr = get_psw_address(regs, pgm_int_code); \ 395 do_trap(pgm_int_code, signr, str, regs, &info); \ 396 } 397 398 DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR, 399 "addressing exception") 400 DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN, 401 "execute exception") 402 DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV, 403 "fixpoint divide exception") 404 DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF, 405 "fixpoint overflow exception") 406 DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF, 407 "HFP overflow exception") 408 DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND, 409 "HFP underflow exception") 410 DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES, 411 "HFP significance exception") 412 DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV, 413 "HFP divide exception") 414 DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV, 415 "HFP square root exception") 416 DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN, 417 "operand exception") 418 DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC, 419 "privileged operation") 420 DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN, 421 "special operation exception") 422 DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN, 423 "translation exception") 424 425 static inline void do_fp_trap(struct pt_regs *regs, void __user *location, 426 int fpc, long pgm_int_code) 427 { 428 siginfo_t si; 429 430 si.si_signo = SIGFPE; 431 si.si_errno = 0; 432 si.si_addr = location; 433 si.si_code = 0; 434 /* FPC[2] is Data Exception Code */ 435 if ((fpc & 0x00000300) == 0) { 436 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 437 if (fpc & 0x8000) /* invalid fp operation */ 438 si.si_code = FPE_FLTINV; 439 else if (fpc & 0x4000) /* div by 0 */ 440 si.si_code = FPE_FLTDIV; 441 else if (fpc & 0x2000) /* overflow */ 442 si.si_code = FPE_FLTOVF; 443 else if (fpc & 0x1000) /* underflow */ 444 si.si_code = FPE_FLTUND; 445 else if (fpc & 0x0800) /* inexact */ 446 si.si_code = FPE_FLTRES; 447 } 448 do_trap(pgm_int_code, SIGFPE, 449 "floating point exception", regs, &si); 450 } 451 452 static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code, 453 unsigned long trans_exc_code) 454 { 455 siginfo_t info; 456 __u8 opcode[6]; 457 __u16 __user *location; 458 int signal = 0; 459 460 location = get_psw_address(regs, pgm_int_code); 461 462 if (regs->psw.mask & PSW_MASK_PSTATE) { 463 if (get_user(*((__u16 *) opcode), (__u16 __user *) location)) 464 return; 465 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { 466 if (tracehook_consider_fatal_signal(current, SIGTRAP)) 467 force_sig(SIGTRAP, current); 468 else 469 signal = SIGILL; 470 #ifdef CONFIG_MATHEMU 471 } else if (opcode[0] == 0xb3) { 472 if (get_user(*((__u16 *) (opcode+2)), location+1)) 473 return; 474 signal = math_emu_b3(opcode, regs); 475 } else if (opcode[0] == 0xed) { 476 if (get_user(*((__u32 *) (opcode+2)), 477 (__u32 __user *)(location+1))) 478 return; 479 signal = math_emu_ed(opcode, regs); 480 } else if (*((__u16 *) opcode) == 0xb299) { 481 if (get_user(*((__u16 *) (opcode+2)), location+1)) 482 return; 483 signal = math_emu_srnm(opcode, regs); 484 } else if (*((__u16 *) opcode) == 0xb29c) { 485 if (get_user(*((__u16 *) (opcode+2)), location+1)) 486 return; 487 signal = math_emu_stfpc(opcode, regs); 488 } else if (*((__u16 *) opcode) == 0xb29d) { 489 if (get_user(*((__u16 *) (opcode+2)), location+1)) 490 return; 491 signal = math_emu_lfpc(opcode, regs); 492 #endif 493 } else 494 signal = SIGILL; 495 } else { 496 /* 497 * If we get an illegal op in kernel mode, send it through the 498 * kprobes notifier. If kprobes doesn't pick it up, SIGILL 499 */ 500 if (notify_die(DIE_BPT, "bpt", regs, pgm_int_code, 501 3, SIGTRAP) != NOTIFY_STOP) 502 signal = SIGILL; 503 } 504 505 #ifdef CONFIG_MATHEMU 506 if (signal == SIGFPE) 507 do_fp_trap(regs, location, 508 current->thread.fp_regs.fpc, pgm_int_code); 509 else if (signal == SIGSEGV) { 510 info.si_signo = signal; 511 info.si_errno = 0; 512 info.si_code = SEGV_MAPERR; 513 info.si_addr = (void __user *) location; 514 do_trap(pgm_int_code, signal, 515 "user address fault", regs, &info); 516 } else 517 #endif 518 if (signal) { 519 info.si_signo = signal; 520 info.si_errno = 0; 521 info.si_code = ILL_ILLOPC; 522 info.si_addr = (void __user *) location; 523 do_trap(pgm_int_code, signal, 524 "illegal operation", regs, &info); 525 } 526 } 527 528 529 #ifdef CONFIG_MATHEMU 530 asmlinkage void specification_exception(struct pt_regs *regs, 531 long pgm_int_code, 532 unsigned long trans_exc_code) 533 { 534 __u8 opcode[6]; 535 __u16 __user *location = NULL; 536 int signal = 0; 537 538 location = (__u16 __user *) get_psw_address(regs, pgm_int_code); 539 540 if (regs->psw.mask & PSW_MASK_PSTATE) { 541 get_user(*((__u16 *) opcode), location); 542 switch (opcode[0]) { 543 case 0x28: /* LDR Rx,Ry */ 544 signal = math_emu_ldr(opcode); 545 break; 546 case 0x38: /* LER Rx,Ry */ 547 signal = math_emu_ler(opcode); 548 break; 549 case 0x60: /* STD R,D(X,B) */ 550 get_user(*((__u16 *) (opcode+2)), location+1); 551 signal = math_emu_std(opcode, regs); 552 break; 553 case 0x68: /* LD R,D(X,B) */ 554 get_user(*((__u16 *) (opcode+2)), location+1); 555 signal = math_emu_ld(opcode, regs); 556 break; 557 case 0x70: /* STE R,D(X,B) */ 558 get_user(*((__u16 *) (opcode+2)), location+1); 559 signal = math_emu_ste(opcode, regs); 560 break; 561 case 0x78: /* LE R,D(X,B) */ 562 get_user(*((__u16 *) (opcode+2)), location+1); 563 signal = math_emu_le(opcode, regs); 564 break; 565 default: 566 signal = SIGILL; 567 break; 568 } 569 } else 570 signal = SIGILL; 571 572 if (signal == SIGFPE) 573 do_fp_trap(regs, location, 574 current->thread.fp_regs.fpc, pgm_int_code); 575 else if (signal) { 576 siginfo_t info; 577 info.si_signo = signal; 578 info.si_errno = 0; 579 info.si_code = ILL_ILLOPN; 580 info.si_addr = location; 581 do_trap(pgm_int_code, signal, 582 "specification exception", regs, &info); 583 } 584 } 585 #else 586 DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN, 587 "specification exception"); 588 #endif 589 590 static void data_exception(struct pt_regs *regs, long pgm_int_code, 591 unsigned long trans_exc_code) 592 { 593 __u16 __user *location; 594 int signal = 0; 595 596 location = get_psw_address(regs, pgm_int_code); 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, pgm_int_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(pgm_int_code, signal, "data exception", regs, &info); 670 } 671 } 672 673 static void space_switch_exception(struct pt_regs *regs, long pgm_int_code, 674 unsigned long trans_exc_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_psw_address(regs, pgm_int_code); 686 do_trap(pgm_int_code, SIGILL, "space switch event", regs, &info); 687 } 688 689 asmlinkage void __kprobes 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_asce_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 /* Enable machine checks early. */ 735 local_mcck_enable(); 736 } 737