arch/s390/kernel/traps.c

   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/config.h>
  18 #include <linux/sched.h>
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/smp.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/init.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/delay.h>
  30 #include <linux/module.h>
  31 #include <linux/kallsyms.h>
  32
  33 #include <asm/system.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/io.h>
  36 #include <asm/atomic.h>
  37 #include <asm/mathemu.h>
  38 #include <asm/cpcmd.h>
  39 #include <asm/s390_ext.h>
  40 #include <asm/lowcore.h>
  41
  42 /* Called from entry.S only */
  43 extern void handle_per_exception(struct pt_regs *regs);
  44
  45 typedef void pgm_check_handler_t(struct pt_regs *, long);
  46 pgm_check_handler_t *pgm_check_table[128];
  47
  48 #ifdef CONFIG_SYSCTL
  49 #ifdef CONFIG_PROCESS_DEBUG
  50 int sysctl_userprocess_debug = 1;
  51 #else
  52 int sysctl_userprocess_debug = 0;
  53 #endif
  54 #endif
  55
  56 extern pgm_check_handler_t do_protection_exception;
  57 extern pgm_check_handler_t do_segment_exception;
  58 extern pgm_check_handler_t do_region_exception;
  59 extern pgm_check_handler_t do_page_exception;
  60 extern pgm_check_handler_t do_pseudo_page_fault;
  61 #ifdef CONFIG_PFAULT
  62 extern int pfault_init(void);
  63 extern void pfault_fini(void);
  64 extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code);
  65 static ext_int_info_t ext_int_pfault;
  66 #endif
  67 #if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_VIRT_TIMER)
  68 extern pgm_check_handler_t do_monitor_call;
  69 #endif
  70
  71 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
  72
  73 #ifndef CONFIG_ARCH_S390X
  74 #define RET_ADDR 56
  75 #define FOURLONG "%08lx %08lx %08lx %08lx\n"
  76 static int kstack_depth_to_print = 12;
  77
  78 #else /* CONFIG_ARCH_S390X */
  79 #define RET_ADDR 112
  80 #define FOURLONG "%016lx %016lx %016lx %016lx\n"
  81 static int kstack_depth_to_print = 20;
  82
  83 #endif /* CONFIG_ARCH_S390X */
  84
  85 void show_trace(struct task_struct *task, unsigned long * stack)
  86 {
  87         unsigned long backchain, low_addr, high_addr, ret_addr;
  88
  89         if (!stack)
  90                 stack = (task == NULL) ? *stack_pointer : &(task->thread.ksp);
  91
  92         printk("Call Trace:\n");
  93         low_addr = ((unsigned long) stack) & PSW_ADDR_INSN;
  94         high_addr = (low_addr & (-THREAD_SIZE)) + THREAD_SIZE;
  95         /* Skip the first frame (biased stack) */
  96         backchain = *((unsigned long *) low_addr) & PSW_ADDR_INSN;
  97         /* Print up to 8 lines */
  98         while  (backchain > low_addr && backchain <= high_addr) {
  99                 ret_addr = *((unsigned long *) (backchain+RET_ADDR)) & PSW_ADDR_INSN;
 100                 printk(" [<%016lx>] ", ret_addr);
 101                 print_symbol("%s\n", ret_addr);
 102                 low_addr = backchain;
 103                 backchain = *((unsigned long *) backchain) & PSW_ADDR_INSN;
 104         }
 105         printk("\n");
 106 }
 107
 108 void show_stack(struct task_struct *task, unsigned long *sp)
 109 {
 110         unsigned long *stack;
 111         int i;
 112
 113         // debugging aid: "show_stack(NULL);" prints the
 114         // back trace for this cpu.
 115
 116         if (!sp) {
 117                 if (task)
 118                         sp = (unsigned long *) task->thread.ksp;
 119                 else
 120                         sp = *stack_pointer;
 121         }
 122
 123         stack = sp;
 124         for (i = 0; i < kstack_depth_to_print; i++) {
 125                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
 126                         break;
 127                 if (i && ((i * sizeof (long) % 32) == 0))
 128                         printk("\n       ");
 129                 printk("%p ", (void *)*stack++);
 130         }
 131         printk("\n");
 132         show_trace(task, sp);
 133 }
 134
 135 /*
 136  * The architecture-independent dump_stack generator
 137  */
 138 void dump_stack(void)
 139 {
 140         show_stack(0, 0);
 141 }
 142
 143 EXPORT_SYMBOL(dump_stack);
 144
 145 void show_registers(struct pt_regs *regs)
 146 {
 147         mm_segment_t old_fs;
 148         char *mode;
 149         int i;
 150
 151         mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
 152         printk("%s PSW : %p %p",
 153                mode, (void *) regs->psw.mask,
 154                (void *) regs->psw.addr);
 155         print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
 156         printk("%s GPRS: " FOURLONG, mode,
 157                regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
 158         printk("           " FOURLONG,
 159                regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
 160         printk("           " FOURLONG,
 161                regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
 162         printk("           " FOURLONG,
 163                regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
 164
 165 #if 0
 166         /* FIXME: this isn't needed any more but it changes the ksymoops
 167          * input. To remove or not to remove ... */
 168         save_access_regs(regs->acrs);
 169         printk("%s ACRS: %08x %08x %08x %08x\n", mode,
 170                regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]);
 171         printk("           %08x %08x %08x %08x\n",
 172                regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]);
 173         printk("           %08x %08x %08x %08x\n",
 174                regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]);
 175         printk("           %08x %08x %08x %08x\n",
 176                regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]);
 177 #endif
 178
 179         /*
 180          * Print the first 20 byte of the instruction stream at the
 181          * time of the fault.
 182          */
 183         old_fs = get_fs();
 184         if (regs->psw.mask & PSW_MASK_PSTATE)
 185                 set_fs(USER_DS);
 186         else
 187                 set_fs(KERNEL_DS);
 188         printk("%s Code: ", mode);
 189         for (i = 0; i < 20; i++) {
 190                 unsigned char c;
 191                 if (__get_user(c, (char __user *)(regs->psw.addr + i))) {
 192                         printk(" Bad PSW.");
 193                         break;
 194                 }
 195                 printk("%02x ", c);
 196         }
 197         set_fs(old_fs);
 198
 199         printk("\n");
 200 }
 201
 202 /* This is called from fs/proc/array.c */
 203 char *task_show_regs(struct task_struct *task, char *buffer)
 204 {
 205         struct pt_regs *regs;
 206
 207         regs = __KSTK_PTREGS(task);
 208         buffer += sprintf(buffer, "task: %p, ksp: %p\n",
 209                        task, (void *)task->thread.ksp);
 210         buffer += sprintf(buffer, "User PSW : %p %p\n",
 211                        (void *) regs->psw.mask, (void *)regs->psw.addr);
 212
 213         buffer += sprintf(buffer, "User GPRS: " FOURLONG,
 214                           regs->gprs[0], regs->gprs[1],
 215                           regs->gprs[2], regs->gprs[3]);
 216         buffer += sprintf(buffer, "           " FOURLONG,
 217                           regs->gprs[4], regs->gprs[5],
 218                           regs->gprs[6], regs->gprs[7]);
 219         buffer += sprintf(buffer, "           " FOURLONG,
 220                           regs->gprs[8], regs->gprs[9],
 221                           regs->gprs[10], regs->gprs[11]);
 222         buffer += sprintf(buffer, "           " FOURLONG,
 223                           regs->gprs[12], regs->gprs[13],
 224                           regs->gprs[14], regs->gprs[15]);
 225         buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
 226                           task->thread.acrs[0], task->thread.acrs[1],
 227                           task->thread.acrs[2], task->thread.acrs[3]);
 228         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
 229                           task->thread.acrs[4], task->thread.acrs[5],
 230                           task->thread.acrs[6], task->thread.acrs[7]);
 231         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
 232                           task->thread.acrs[8], task->thread.acrs[9],
 233                           task->thread.acrs[10], task->thread.acrs[11]);
 234         buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
 235                           task->thread.acrs[12], task->thread.acrs[13],
 236                           task->thread.acrs[14], task->thread.acrs[15]);
 237         return buffer;
 238 }
 239
 240 spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
 241
 242 void die(const char * str, struct pt_regs * regs, long err)
 243 {
 244         static int die_counter;
 245         console_verbose();
 246         spin_lock_irq(&die_lock);
 247         bust_spinlocks(1);
 248         printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
 249         show_regs(regs);
 250         bust_spinlocks(0);
 251         spin_unlock_irq(&die_lock);
 252         if (in_interrupt())
 253                 panic("Fatal exception in interrupt");
 254         if (panic_on_oops)
 255                 panic("Fatal exception: panic_on_oops");
 256         do_exit(SIGSEGV);
 257 }
 258
 259 static void inline do_trap(long interruption_code, int signr, char *str,
 260                            struct pt_regs *regs, siginfo_t *info)
 261 {
 262         /*
 263          * We got all needed information from the lowcore and can
 264          * now safely switch on interrupts.
 265          */
 266         if (regs->psw.mask & PSW_MASK_PSTATE)
 267                 local_irq_enable();
 268
 269         if (regs->psw.mask & PSW_MASK_PSTATE) {
 270                 struct task_struct *tsk = current;
 271
 272                 tsk->thread.trap_no = interruption_code & 0xffff;
 273                 if (info)
 274                         force_sig_info(signr, info, tsk);
 275                 else
 276                         force_sig(signr, tsk);
 277 #ifndef CONFIG_SYSCTL
 278 #ifdef CONFIG_PROCESS_DEBUG
 279                 printk("User process fault: interruption code 0x%lX\n",
 280                        interruption_code);
 281                 show_regs(regs);
 282 #endif
 283 #else
 284                 if (sysctl_userprocess_debug) {
 285                         printk("User process fault: interruption code 0x%lX\n",
 286                                interruption_code);
 287                         show_regs(regs);
 288                 }
 289 #endif
 290         } else {
 291                 const struct exception_table_entry *fixup;
 292                 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
 293                 if (fixup)
 294                         regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
 295                 else
 296                         die(str, regs, interruption_code);
 297         }
 298 }
 299
 300 static inline void *get_check_address(struct pt_regs *regs)
 301 {
 302         return (void *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
 303 }
 304
 305 int do_debugger_trap(struct pt_regs *regs)
 306 {
 307         if ((regs->psw.mask & PSW_MASK_PSTATE) &&
 308             (current->ptrace & PT_PTRACED)) {
 309                 force_sig(SIGTRAP,current);
 310                 return 0;
 311         }
 312         return 1;
 313 }
 314
 315 #define DO_ERROR(signr, str, name) \
 316 asmlinkage void name(struct pt_regs * regs, long interruption_code) \
 317 { \
 318         do_trap(interruption_code, signr, str, regs, NULL); \
 319 }
 320
 321 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
 322 asmlinkage void name(struct pt_regs * regs, long interruption_code) \
 323 { \
 324         siginfo_t info; \
 325         info.si_signo = signr; \
 326         info.si_errno = 0; \
 327         info.si_code = sicode; \
 328         info.si_addr = (void *)siaddr; \
 329         do_trap(interruption_code, signr, str, regs, &info); \
 330 }
 331
 332 DO_ERROR(SIGSEGV, "Unknown program exception", default_trap_handler)
 333
 334 DO_ERROR_INFO(SIGBUS, "addressing exception", addressing_exception,
 335               BUS_ADRERR, get_check_address(regs))
 336 DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
 337               ILL_ILLOPN, get_check_address(regs))
 338 DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
 339               FPE_INTDIV, get_check_address(regs))
 340 DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
 341               ILL_ILLOPN, get_check_address(regs))
 342 DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
 343               ILL_PRVOPC, get_check_address(regs))
 344 DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
 345               ILL_ILLOPN, get_check_address(regs))
 346 DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
 347               ILL_ILLOPN, get_check_address(regs))
 348
 349 static inline void
 350 do_fp_trap(struct pt_regs *regs, void *location,
 351            int fpc, long interruption_code)
 352 {
 353         siginfo_t si;
 354
 355         si.si_signo = SIGFPE;
 356         si.si_errno = 0;
 357         si.si_addr = location;
 358         si.si_code = 0;
 359         /* FPC[2] is Data Exception Code */
 360         if ((fpc & 0x00000300) == 0) {
 361                 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
 362                 if (fpc & 0x8000) /* invalid fp operation */
 363                         si.si_code = FPE_FLTINV;
 364                 else if (fpc & 0x4000) /* div by 0 */
 365                         si.si_code = FPE_FLTDIV;
 366                 else if (fpc & 0x2000) /* overflow */
 367                         si.si_code = FPE_FLTOVF;
 368                 else if (fpc & 0x1000) /* underflow */
 369                         si.si_code = FPE_FLTUND;
 370                 else if (fpc & 0x0800) /* inexact */
 371                         si.si_code = FPE_FLTRES;
 372         }
 373         current->thread.ieee_instruction_pointer = (addr_t) location;
 374         do_trap(interruption_code, SIGFPE,
 375                 "floating point exception", regs, &si);
 376 }
 377
 378 asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
 379 {
 380         __u8 opcode[6];
 381         __u16 *location;
 382         int signal = 0;
 383
 384         location = (__u16 *) get_check_address(regs);
 385
 386         /*
 387          * We got all needed information from the lowcore and can
 388          * now safely switch on interrupts.
 389          */
 390         if (regs->psw.mask & PSW_MASK_PSTATE)
 391                 local_irq_enable();
 392
 393         if (regs->psw.mask & PSW_MASK_PSTATE)
 394                 get_user(*((__u16 *) opcode), (__u16 __user *)location);
 395         else
 396                 *((__u16 *)opcode)=*((__u16 *)location);
 397         if (*((__u16 *)opcode)==S390_BREAKPOINT_U16)
 398         {
 399                 if(do_debugger_trap(regs))
 400                         signal = SIGILL;
 401         }
 402 #ifdef CONFIG_MATHEMU
 403         else if (regs->psw.mask & PSW_MASK_PSTATE)
 404         {
 405                 if (opcode[0] == 0xb3) {
 406                         get_user(*((__u16 *) (opcode+2)), location+1);
 407                         signal = math_emu_b3(opcode, regs);
 408                 } else if (opcode[0] == 0xed) {
 409                         get_user(*((__u32 *) (opcode+2)),
 410                                  (__u32 *)(location+1));
 411                         signal = math_emu_ed(opcode, regs);
 412                 } else if (*((__u16 *) opcode) == 0xb299) {
 413                         get_user(*((__u16 *) (opcode+2)), location+1);
 414                         signal = math_emu_srnm(opcode, regs);
 415                 } else if (*((__u16 *) opcode) == 0xb29c) {
 416                         get_user(*((__u16 *) (opcode+2)), location+1);
 417                         signal = math_emu_stfpc(opcode, regs);
 418                 } else if (*((__u16 *) opcode) == 0xb29d) {
 419                         get_user(*((__u16 *) (opcode+2)), location+1);
 420                         signal = math_emu_lfpc(opcode, regs);
 421                 } else
 422                         signal = SIGILL;
 423         }
 424 #endif
 425         else
 426                 signal = SIGILL;
 427         if (signal == SIGFPE)
 428                 do_fp_trap(regs, location,
 429                            current->thread.fp_regs.fpc, interruption_code);
 430         else if (signal)
 431                 do_trap(interruption_code, signal,
 432                         "illegal operation", regs, NULL);
 433 }
 434
 435
 436 #ifdef CONFIG_MATHEMU
 437 asmlinkage void
 438 specification_exception(struct pt_regs * regs, long interruption_code)
 439 {
 440         __u8 opcode[6];
 441         __u16 *location = NULL;
 442         int signal = 0;
 443
 444         location = (__u16 *) get_check_address(regs);
 445
 446         /*
 447          * We got all needed information from the lowcore and can
 448          * now safely switch on interrupts.
 449          */
 450         if (regs->psw.mask & PSW_MASK_PSTATE)
 451                 local_irq_enable();
 452
 453         if (regs->psw.mask & PSW_MASK_PSTATE) {
 454                 get_user(*((__u16 *) opcode), location);
 455                 switch (opcode[0]) {
 456                 case 0x28: /* LDR Rx,Ry   */
 457                         signal = math_emu_ldr(opcode);
 458                         break;
 459                 case 0x38: /* LER Rx,Ry   */
 460                         signal = math_emu_ler(opcode);
 461                         break;
 462                 case 0x60: /* STD R,D(X,B) */
 463                         get_user(*((__u16 *) (opcode+2)), location+1);
 464                         signal = math_emu_std(opcode, regs);
 465                         break;
 466                 case 0x68: /* LD R,D(X,B) */
 467                         get_user(*((__u16 *) (opcode+2)), location+1);
 468                         signal = math_emu_ld(opcode, regs);
 469                         break;
 470                 case 0x70: /* STE R,D(X,B) */
 471                         get_user(*((__u16 *) (opcode+2)), location+1);
 472                         signal = math_emu_ste(opcode, regs);
 473                         break;
 474                 case 0x78: /* LE R,D(X,B) */
 475                         get_user(*((__u16 *) (opcode+2)), location+1);
 476                         signal = math_emu_le(opcode, regs);
 477                         break;
 478                 default:
 479                         signal = SIGILL;
 480                         break;
 481                 }
 482         } else
 483                 signal = SIGILL;
 484         if (signal == SIGFPE)
 485                 do_fp_trap(regs, location,
 486                            current->thread.fp_regs.fpc, interruption_code);
 487         else if (signal) {
 488                 siginfo_t info;
 489                 info.si_signo = signal;
 490                 info.si_errno = 0;
 491                 info.si_code = ILL_ILLOPN;
 492                 info.si_addr = location;
 493                 do_trap(interruption_code, signal,
 494                         "specification exception", regs, &info);
 495         }
 496 }
 497 #else
 498 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
 499               ILL_ILLOPN, get_check_address(regs));
 500 #endif
 501
 502 asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
 503 {
 504         __u16 *location;
 505         int signal = 0;
 506
 507         location = (__u16 *) get_check_address(regs);
 508
 509         /*
 510          * We got all needed information from the lowcore and can
 511          * now safely switch on interrupts.
 512          */
 513         if (regs->psw.mask & PSW_MASK_PSTATE)
 514                 local_irq_enable();
 515
 516         if (MACHINE_HAS_IEEE)
 517                 __asm__ volatile ("stfpc %0\n\t"
 518                                   : "=m" (current->thread.fp_regs.fpc));
 519
 520 #ifdef CONFIG_MATHEMU
 521         else if (regs->psw.mask & PSW_MASK_PSTATE) {
 522                 __u8 opcode[6];
 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                 case 0xb3:
 548                         get_user(*((__u16 *) (opcode+2)), location+1);
 549                         signal = math_emu_b3(opcode, regs);
 550                         break;
 551                 case 0xed:
 552                         get_user(*((__u32 *) (opcode+2)),
 553                                  (__u32 *)(location+1));
 554                         signal = math_emu_ed(opcode, regs);
 555                         break;
 556                 case 0xb2:
 557                         if (opcode[1] == 0x99) {
 558                                 get_user(*((__u16 *) (opcode+2)), location+1);
 559                                 signal = math_emu_srnm(opcode, regs);
 560                         } else if (opcode[1] == 0x9c) {
 561                                 get_user(*((__u16 *) (opcode+2)), location+1);
 562                                 signal = math_emu_stfpc(opcode, regs);
 563                         } else if (opcode[1] == 0x9d) {
 564                                 get_user(*((__u16 *) (opcode+2)), location+1);
 565                                 signal = math_emu_lfpc(opcode, regs);
 566                         } else
 567                                 signal = SIGILL;
 568                         break;
 569                 default:
 570                         signal = SIGILL;
 571                         break;
 572                 }
 573         }
 574 #endif
 575         if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
 576                 signal = SIGFPE;
 577         else
 578                 signal = SIGILL;
 579         if (signal == SIGFPE)
 580                 do_fp_trap(regs, location,
 581                            current->thread.fp_regs.fpc, interruption_code);
 582         else if (signal) {
 583                 siginfo_t info;
 584                 info.si_signo = signal;
 585                 info.si_errno = 0;
 586                 info.si_code = ILL_ILLOPN;
 587                 info.si_addr = location;
 588                 do_trap(interruption_code, signal,
 589                         "data exception", regs, &info);
 590         }
 591 }
 592
 593
 594
 595 /* init is done in lowcore.S and head.S */
 596
 597 void __init trap_init(void)
 598 {
 599         int i;
 600
 601         for (i = 0; i < 128; i++)
 602           pgm_check_table[i] = &default_trap_handler;
 603         pgm_check_table[1] = &illegal_op;
 604         pgm_check_table[2] = &privileged_op;
 605         pgm_check_table[3] = &execute_exception;
 606         pgm_check_table[4] = &do_protection_exception;
 607         pgm_check_table[5] = &addressing_exception;
 608         pgm_check_table[6] = &specification_exception;
 609         pgm_check_table[7] = &data_exception;
 610         pgm_check_table[9] = &divide_exception;
 611         pgm_check_table[0x10] = &do_segment_exception;
 612         pgm_check_table[0x11] = &do_page_exception;
 613         pgm_check_table[0x12] = &translation_exception;
 614         pgm_check_table[0x13] = &special_op_exception;
 615 #ifndef CONFIG_ARCH_S390X
 616         pgm_check_table[0x14] = &do_pseudo_page_fault;
 617 #else /* CONFIG_ARCH_S390X */
 618         pgm_check_table[0x38] = &addressing_exception;
 619         pgm_check_table[0x3B] = &do_region_exception;
 620 #endif /* CONFIG_ARCH_S390X */
 621         pgm_check_table[0x15] = &operand_exception;
 622         pgm_check_table[0x1C] = &privileged_op;
 623 #if defined(CONFIG_VIRT_TIMER) || defined(CONFIG_NO_IDLE_HZ)
 624         pgm_check_table[0x40] = &do_monitor_call;
 625 #endif
 626         if (MACHINE_IS_VM) {
 627                 /*
 628                  * First try to get pfault pseudo page faults going.
 629                  * If this isn't available turn on pagex page faults.
 630                  */
 631 #ifdef CONFIG_PFAULT
 632                 /* request the 0x2603 external interrupt */
 633                 if (register_early_external_interrupt(0x2603, pfault_interrupt,
 634                                                       &ext_int_pfault) != 0)
 635                         panic("Couldn't request external interrupt 0x2603");
 636
 637                 if (pfault_init() == 0)
 638                         return;
 639
 640                 /* Tough luck, no pfault. */
 641                 unregister_early_external_interrupt(0x2603, pfault_interrupt,
 642                                                     &ext_int_pfault);
 643 #endif
 644 #ifndef CONFIG_ARCH_S390X
 645                 cpcmd("SET PAGEX ON", NULL, 0);
 646 #endif
 647         }
 648 }