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/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 #ifdef CONFIG_SYSCTL 50 #ifdef CONFIG_PROCESS_DEBUG 51 int sysctl_userprocess_debug = 1; 52 #else 53 int sysctl_userprocess_debug = 0; 54 #endif 55 #endif 56 57 extern pgm_check_handler_t do_protection_exception; 58 extern pgm_check_handler_t do_dat_exception; 59 extern pgm_check_handler_t do_asce_exception; 60 61 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; }) 62 63 #ifndef CONFIG_64BIT 64 #define FOURLONG "%08lx %08lx %08lx %08lx\n" 65 static int kstack_depth_to_print = 12; 66 #else /* CONFIG_64BIT */ 67 #define FOURLONG "%016lx %016lx %016lx %016lx\n" 68 static int kstack_depth_to_print = 20; 69 #endif /* CONFIG_64BIT */ 70 71 /* 72 * For show_trace we have tree different stack to consider: 73 * - the panic stack which is used if the kernel stack has overflown 74 * - the asynchronous interrupt stack (cpu related) 75 * - the synchronous kernel stack (process related) 76 * The stack trace can start at any of the three stack and can potentially 77 * touch all of them. The order is: panic stack, async stack, sync stack. 78 */ 79 static unsigned long 80 __show_trace(unsigned long sp, unsigned long low, unsigned long high) 81 { 82 struct stack_frame *sf; 83 struct pt_regs *regs; 84 85 while (1) { 86 sp = sp & PSW_ADDR_INSN; 87 if (sp < low || sp > high - sizeof(*sf)) 88 return sp; 89 sf = (struct stack_frame *) sp; 90 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 91 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); 92 /* Follow the backchain. */ 93 while (1) { 94 low = sp; 95 sp = sf->back_chain & PSW_ADDR_INSN; 96 if (!sp) 97 break; 98 if (sp <= low || sp > high - sizeof(*sf)) 99 return sp; 100 sf = (struct stack_frame *) sp; 101 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 102 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); 103 } 104 /* Zero backchain detected, check for interrupt frame. */ 105 sp = (unsigned long) (sf + 1); 106 if (sp <= low || sp > high - sizeof(*regs)) 107 return sp; 108 regs = (struct pt_regs *) sp; 109 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); 110 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); 111 low = sp; 112 sp = regs->gprs[15]; 113 } 114 } 115 116 void show_trace(struct task_struct *task, unsigned long *stack) 117 { 118 register unsigned long __r15 asm ("15"); 119 unsigned long sp; 120 121 sp = (unsigned long) stack; 122 if (!sp) 123 sp = task ? task->thread.ksp : __r15; 124 printk("Call Trace:\n"); 125 #ifdef CONFIG_CHECK_STACK 126 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, 127 S390_lowcore.panic_stack); 128 #endif 129 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, 130 S390_lowcore.async_stack); 131 if (task) 132 __show_trace(sp, (unsigned long) task_stack_page(task), 133 (unsigned long) task_stack_page(task) + THREAD_SIZE); 134 else 135 __show_trace(sp, S390_lowcore.thread_info, 136 S390_lowcore.thread_info + THREAD_SIZE); 137 if (!task) 138 task = current; 139 debug_show_held_locks(task); 140 } 141 142 void show_stack(struct task_struct *task, unsigned long *sp) 143 { 144 register unsigned long * __r15 asm ("15"); 145 unsigned long *stack; 146 int i; 147 148 if (!sp) 149 stack = task ? (unsigned long *) task->thread.ksp : __r15; 150 else 151 stack = sp; 152 153 for (i = 0; i < kstack_depth_to_print; i++) { 154 if (((addr_t) stack & (THREAD_SIZE-1)) == 0) 155 break; 156 if (i && ((i * sizeof (long) % 32) == 0)) 157 printk("\n "); 158 printk("%p ", (void *)*stack++); 159 } 160 printk("\n"); 161 show_trace(task, sp); 162 } 163 164 #ifdef CONFIG_64BIT 165 void show_last_breaking_event(struct pt_regs *regs) 166 { 167 printk("Last Breaking-Event-Address:\n"); 168 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN); 169 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN); 170 } 171 #endif 172 173 /* 174 * The architecture-independent dump_stack generator 175 */ 176 void dump_stack(void) 177 { 178 printk("CPU: %d %s %s %.*s\n", 179 task_thread_info(current)->cpu, print_tainted(), 180 init_utsname()->release, 181 (int)strcspn(init_utsname()->version, " "), 182 init_utsname()->version); 183 printk("Process %s (pid: %d, task: %p, ksp: %p)\n", 184 current->comm, current->pid, current, 185 (void *) current->thread.ksp); 186 show_stack(NULL, NULL); 187 } 188 EXPORT_SYMBOL(dump_stack); 189 190 static inline int mask_bits(struct pt_regs *regs, unsigned long bits) 191 { 192 return (regs->psw.mask & bits) / ((~bits + 1) & bits); 193 } 194 195 void show_registers(struct pt_regs *regs) 196 { 197 char *mode; 198 199 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl"; 200 printk("%s PSW : %p %p", 201 mode, (void *) regs->psw.mask, 202 (void *) regs->psw.addr); 203 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); 204 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x " 205 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER), 206 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO), 207 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY), 208 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT), 209 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC), 210 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM)); 211 #ifdef CONFIG_64BIT 212 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS)); 213 #endif 214 printk("\n%s GPRS: " FOURLONG, mode, 215 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); 216 printk(" " FOURLONG, 217 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); 218 printk(" " FOURLONG, 219 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); 220 printk(" " FOURLONG, 221 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); 222 223 show_code(regs); 224 } 225 226 /* This is called from fs/proc/array.c */ 227 void task_show_regs(struct seq_file *m, struct task_struct *task) 228 { 229 struct pt_regs *regs; 230 231 regs = task_pt_regs(task); 232 seq_printf(m, "task: %p, ksp: %p\n", 233 task, (void *)task->thread.ksp); 234 seq_printf(m, "User PSW : %p %p\n", 235 (void *) regs->psw.mask, (void *)regs->psw.addr); 236 237 seq_printf(m, "User GPRS: " FOURLONG, 238 regs->gprs[0], regs->gprs[1], 239 regs->gprs[2], regs->gprs[3]); 240 seq_printf(m, " " FOURLONG, 241 regs->gprs[4], regs->gprs[5], 242 regs->gprs[6], regs->gprs[7]); 243 seq_printf(m, " " FOURLONG, 244 regs->gprs[8], regs->gprs[9], 245 regs->gprs[10], regs->gprs[11]); 246 seq_printf(m, " " FOURLONG, 247 regs->gprs[12], regs->gprs[13], 248 regs->gprs[14], regs->gprs[15]); 249 seq_printf(m, "User ACRS: %08x %08x %08x %08x\n", 250 task->thread.acrs[0], task->thread.acrs[1], 251 task->thread.acrs[2], task->thread.acrs[3]); 252 seq_printf(m, " %08x %08x %08x %08x\n", 253 task->thread.acrs[4], task->thread.acrs[5], 254 task->thread.acrs[6], task->thread.acrs[7]); 255 seq_printf(m, " %08x %08x %08x %08x\n", 256 task->thread.acrs[8], task->thread.acrs[9], 257 task->thread.acrs[10], task->thread.acrs[11]); 258 seq_printf(m, " %08x %08x %08x %08x\n", 259 task->thread.acrs[12], task->thread.acrs[13], 260 task->thread.acrs[14], task->thread.acrs[15]); 261 } 262 263 static DEFINE_SPINLOCK(die_lock); 264 265 void die(const char * str, struct pt_regs * regs, long err) 266 { 267 static int die_counter; 268 269 oops_enter(); 270 debug_stop_all(); 271 console_verbose(); 272 spin_lock_irq(&die_lock); 273 bust_spinlocks(1); 274 printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); 275 #ifdef CONFIG_PREEMPT 276 printk("PREEMPT "); 277 #endif 278 #ifdef CONFIG_SMP 279 printk("SMP "); 280 #endif 281 #ifdef CONFIG_DEBUG_PAGEALLOC 282 printk("DEBUG_PAGEALLOC"); 283 #endif 284 printk("\n"); 285 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); 286 show_regs(regs); 287 bust_spinlocks(0); 288 add_taint(TAINT_DIE); 289 spin_unlock_irq(&die_lock); 290 if (in_interrupt()) 291 panic("Fatal exception in interrupt"); 292 if (panic_on_oops) 293 panic("Fatal exception: panic_on_oops"); 294 oops_exit(); 295 do_exit(SIGSEGV); 296 } 297 298 static void inline 299 report_user_fault(long interruption_code, struct pt_regs *regs) 300 { 301 #if defined(CONFIG_SYSCTL) 302 if (!sysctl_userprocess_debug) 303 return; 304 #endif 305 #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG) 306 printk("User process fault: interruption code 0x%lX\n", 307 interruption_code); 308 show_regs(regs); 309 #endif 310 } 311 312 int is_valid_bugaddr(unsigned long addr) 313 { 314 return 1; 315 } 316 317 static void __kprobes inline do_trap(long interruption_code, int signr, 318 char *str, struct pt_regs *regs, 319 siginfo_t *info) 320 { 321 /* 322 * We got all needed information from the lowcore and can 323 * now safely switch on interrupts. 324 */ 325 if (regs->psw.mask & PSW_MASK_PSTATE) 326 local_irq_enable(); 327 328 if (notify_die(DIE_TRAP, str, regs, interruption_code, 329 interruption_code, signr) == NOTIFY_STOP) 330 return; 331 332 if (regs->psw.mask & PSW_MASK_PSTATE) { 333 struct task_struct *tsk = current; 334 335 tsk->thread.trap_no = interruption_code & 0xffff; 336 force_sig_info(signr, info, tsk); 337 report_user_fault(interruption_code, regs); 338 } else { 339 const struct exception_table_entry *fixup; 340 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 341 if (fixup) 342 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 343 else { 344 enum bug_trap_type btt; 345 346 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs); 347 if (btt == BUG_TRAP_TYPE_WARN) 348 return; 349 die(str, regs, interruption_code); 350 } 351 } 352 } 353 354 static inline void __user *get_check_address(struct pt_regs *regs) 355 { 356 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); 357 } 358 359 void __kprobes do_single_step(struct pt_regs *regs) 360 { 361 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, 362 SIGTRAP) == NOTIFY_STOP){ 363 return; 364 } 365 if ((current->ptrace & PT_PTRACED) != 0) 366 force_sig(SIGTRAP, current); 367 } 368 369 static void default_trap_handler(struct pt_regs * regs, long interruption_code) 370 { 371 if (regs->psw.mask & PSW_MASK_PSTATE) { 372 local_irq_enable(); 373 do_exit(SIGSEGV); 374 report_user_fault(interruption_code, regs); 375 } else 376 die("Unknown program exception", regs, interruption_code); 377 } 378 379 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ 380 static void name(struct pt_regs * regs, long interruption_code) \ 381 { \ 382 siginfo_t info; \ 383 info.si_signo = signr; \ 384 info.si_errno = 0; \ 385 info.si_code = sicode; \ 386 info.si_addr = siaddr; \ 387 do_trap(interruption_code, signr, str, regs, &info); \ 388 } 389 390 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, 391 ILL_ILLADR, get_check_address(regs)) 392 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, 393 ILL_ILLOPN, get_check_address(regs)) 394 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, 395 FPE_INTDIV, get_check_address(regs)) 396 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, 397 FPE_INTOVF, get_check_address(regs)) 398 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, 399 FPE_FLTOVF, get_check_address(regs)) 400 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, 401 FPE_FLTUND, get_check_address(regs)) 402 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, 403 FPE_FLTRES, get_check_address(regs)) 404 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, 405 FPE_FLTDIV, get_check_address(regs)) 406 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, 407 FPE_FLTINV, get_check_address(regs)) 408 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, 409 ILL_ILLOPN, get_check_address(regs)) 410 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, 411 ILL_PRVOPC, get_check_address(regs)) 412 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, 413 ILL_ILLOPN, get_check_address(regs)) 414 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, 415 ILL_ILLOPN, get_check_address(regs)) 416 417 static inline void 418 do_fp_trap(struct pt_regs *regs, void __user *location, 419 int fpc, long interruption_code) 420 { 421 siginfo_t si; 422 423 si.si_signo = SIGFPE; 424 si.si_errno = 0; 425 si.si_addr = location; 426 si.si_code = 0; 427 /* FPC[2] is Data Exception Code */ 428 if ((fpc & 0x00000300) == 0) { 429 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 430 if (fpc & 0x8000) /* invalid fp operation */ 431 si.si_code = FPE_FLTINV; 432 else if (fpc & 0x4000) /* div by 0 */ 433 si.si_code = FPE_FLTDIV; 434 else if (fpc & 0x2000) /* overflow */ 435 si.si_code = FPE_FLTOVF; 436 else if (fpc & 0x1000) /* underflow */ 437 si.si_code = FPE_FLTUND; 438 else if (fpc & 0x0800) /* inexact */ 439 si.si_code = FPE_FLTRES; 440 } 441 current->thread.ieee_instruction_pointer = (addr_t) location; 442 do_trap(interruption_code, SIGFPE, 443 "floating point exception", regs, &si); 444 } 445 446 static void illegal_op(struct pt_regs * regs, long interruption_code) 447 { 448 siginfo_t info; 449 __u8 opcode[6]; 450 __u16 __user *location; 451 int signal = 0; 452 453 location = get_check_address(regs); 454 455 /* 456 * We got all needed information from the lowcore and can 457 * now safely switch on interrupts. 458 */ 459 if (regs->psw.mask & PSW_MASK_PSTATE) 460 local_irq_enable(); 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 (current->ptrace & PT_PTRACED) 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, interruption_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, interruption_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(interruption_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(interruption_code, signal, 524 "illegal operation", regs, &info); 525 } 526 } 527 528 529 #ifdef CONFIG_MATHEMU 530 asmlinkage void 531 specification_exception(struct pt_regs * regs, long interruption_code) 532 { 533 __u8 opcode[6]; 534 __u16 __user *location = NULL; 535 int signal = 0; 536 537 location = (__u16 __user *) get_check_address(regs); 538 539 /* 540 * We got all needed information from the lowcore and can 541 * now safely switch on interrupts. 542 */ 543 if (regs->psw.mask & PSW_MASK_PSTATE) 544 local_irq_enable(); 545 546 if (regs->psw.mask & PSW_MASK_PSTATE) { 547 get_user(*((__u16 *) opcode), location); 548 switch (opcode[0]) { 549 case 0x28: /* LDR Rx,Ry */ 550 signal = math_emu_ldr(opcode); 551 break; 552 case 0x38: /* LER Rx,Ry */ 553 signal = math_emu_ler(opcode); 554 break; 555 case 0x60: /* STD R,D(X,B) */ 556 get_user(*((__u16 *) (opcode+2)), location+1); 557 signal = math_emu_std(opcode, regs); 558 break; 559 case 0x68: /* LD R,D(X,B) */ 560 get_user(*((__u16 *) (opcode+2)), location+1); 561 signal = math_emu_ld(opcode, regs); 562 break; 563 case 0x70: /* STE R,D(X,B) */ 564 get_user(*((__u16 *) (opcode+2)), location+1); 565 signal = math_emu_ste(opcode, regs); 566 break; 567 case 0x78: /* LE R,D(X,B) */ 568 get_user(*((__u16 *) (opcode+2)), location+1); 569 signal = math_emu_le(opcode, regs); 570 break; 571 default: 572 signal = SIGILL; 573 break; 574 } 575 } else 576 signal = SIGILL; 577 578 if (signal == SIGFPE) 579 do_fp_trap(regs, location, 580 current->thread.fp_regs.fpc, interruption_code); 581 else if (signal) { 582 siginfo_t info; 583 info.si_signo = signal; 584 info.si_errno = 0; 585 info.si_code = ILL_ILLOPN; 586 info.si_addr = location; 587 do_trap(interruption_code, signal, 588 "specification exception", regs, &info); 589 } 590 } 591 #else 592 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 593 ILL_ILLOPN, get_check_address(regs)); 594 #endif 595 596 static void data_exception(struct pt_regs * regs, long interruption_code) 597 { 598 __u16 __user *location; 599 int signal = 0; 600 601 location = get_check_address(regs); 602 603 /* 604 * We got all needed information from the lowcore and can 605 * now safely switch on interrupts. 606 */ 607 if (regs->psw.mask & PSW_MASK_PSTATE) 608 local_irq_enable(); 609 610 if (MACHINE_HAS_IEEE) 611 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc)); 612 613 #ifdef CONFIG_MATHEMU 614 else if (regs->psw.mask & PSW_MASK_PSTATE) { 615 __u8 opcode[6]; 616 get_user(*((__u16 *) opcode), location); 617 switch (opcode[0]) { 618 case 0x28: /* LDR Rx,Ry */ 619 signal = math_emu_ldr(opcode); 620 break; 621 case 0x38: /* LER Rx,Ry */ 622 signal = math_emu_ler(opcode); 623 break; 624 case 0x60: /* STD R,D(X,B) */ 625 get_user(*((__u16 *) (opcode+2)), location+1); 626 signal = math_emu_std(opcode, regs); 627 break; 628 case 0x68: /* LD R,D(X,B) */ 629 get_user(*((__u16 *) (opcode+2)), location+1); 630 signal = math_emu_ld(opcode, regs); 631 break; 632 case 0x70: /* STE R,D(X,B) */ 633 get_user(*((__u16 *) (opcode+2)), location+1); 634 signal = math_emu_ste(opcode, regs); 635 break; 636 case 0x78: /* LE R,D(X,B) */ 637 get_user(*((__u16 *) (opcode+2)), location+1); 638 signal = math_emu_le(opcode, regs); 639 break; 640 case 0xb3: 641 get_user(*((__u16 *) (opcode+2)), location+1); 642 signal = math_emu_b3(opcode, regs); 643 break; 644 case 0xed: 645 get_user(*((__u32 *) (opcode+2)), 646 (__u32 __user *)(location+1)); 647 signal = math_emu_ed(opcode, regs); 648 break; 649 case 0xb2: 650 if (opcode[1] == 0x99) { 651 get_user(*((__u16 *) (opcode+2)), location+1); 652 signal = math_emu_srnm(opcode, regs); 653 } else if (opcode[1] == 0x9c) { 654 get_user(*((__u16 *) (opcode+2)), location+1); 655 signal = math_emu_stfpc(opcode, regs); 656 } else if (opcode[1] == 0x9d) { 657 get_user(*((__u16 *) (opcode+2)), location+1); 658 signal = math_emu_lfpc(opcode, regs); 659 } else 660 signal = SIGILL; 661 break; 662 default: 663 signal = SIGILL; 664 break; 665 } 666 } 667 #endif 668 if (current->thread.fp_regs.fpc & FPC_DXC_MASK) 669 signal = SIGFPE; 670 else 671 signal = SIGILL; 672 if (signal == SIGFPE) 673 do_fp_trap(regs, location, 674 current->thread.fp_regs.fpc, interruption_code); 675 else if (signal) { 676 siginfo_t info; 677 info.si_signo = signal; 678 info.si_errno = 0; 679 info.si_code = ILL_ILLOPN; 680 info.si_addr = location; 681 do_trap(interruption_code, signal, 682 "data exception", regs, &info); 683 } 684 } 685 686 static void space_switch_exception(struct pt_regs * regs, long int_code) 687 { 688 siginfo_t info; 689 690 /* Set user psw back to home space mode. */ 691 if (regs->psw.mask & PSW_MASK_PSTATE) 692 regs->psw.mask |= PSW_ASC_HOME; 693 /* Send SIGILL. */ 694 info.si_signo = SIGILL; 695 info.si_errno = 0; 696 info.si_code = ILL_PRVOPC; 697 info.si_addr = get_check_address(regs); 698 do_trap(int_code, SIGILL, "space switch event", regs, &info); 699 } 700 701 asmlinkage void kernel_stack_overflow(struct pt_regs * regs) 702 { 703 bust_spinlocks(1); 704 printk("Kernel stack overflow.\n"); 705 show_regs(regs); 706 bust_spinlocks(0); 707 panic("Corrupt kernel stack, can't continue."); 708 } 709 710 /* init is done in lowcore.S and head.S */ 711 712 void __init trap_init(void) 713 { 714 int i; 715 716 for (i = 0; i < 128; i++) 717 pgm_check_table[i] = &default_trap_handler; 718 pgm_check_table[1] = &illegal_op; 719 pgm_check_table[2] = &privileged_op; 720 pgm_check_table[3] = &execute_exception; 721 pgm_check_table[4] = &do_protection_exception; 722 pgm_check_table[5] = &addressing_exception; 723 pgm_check_table[6] = &specification_exception; 724 pgm_check_table[7] = &data_exception; 725 pgm_check_table[8] = &overflow_exception; 726 pgm_check_table[9] = ÷_exception; 727 pgm_check_table[0x0A] = &overflow_exception; 728 pgm_check_table[0x0B] = ÷_exception; 729 pgm_check_table[0x0C] = &hfp_overflow_exception; 730 pgm_check_table[0x0D] = &hfp_underflow_exception; 731 pgm_check_table[0x0E] = &hfp_significance_exception; 732 pgm_check_table[0x0F] = &hfp_divide_exception; 733 pgm_check_table[0x10] = &do_dat_exception; 734 pgm_check_table[0x11] = &do_dat_exception; 735 pgm_check_table[0x12] = &translation_exception; 736 pgm_check_table[0x13] = &special_op_exception; 737 #ifdef CONFIG_64BIT 738 pgm_check_table[0x38] = &do_asce_exception; 739 pgm_check_table[0x39] = &do_dat_exception; 740 pgm_check_table[0x3A] = &do_dat_exception; 741 pgm_check_table[0x3B] = &do_dat_exception; 742 #endif /* CONFIG_64BIT */ 743 pgm_check_table[0x15] = &operand_exception; 744 pgm_check_table[0x1C] = &space_switch_exception; 745 pgm_check_table[0x1D] = &hfp_sqrt_exception; 746 pfault_irq_init(); 747 } 748