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   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         printk("\n");
 138         if (!task)
 139                 task = current;
 140         debug_show_held_locks(task);
 141 }
 142
 143 void show_stack(struct task_struct *task, unsigned long *sp)
 144 {
 145         register unsigned long * __r15 asm ("15");
 146         unsigned long *stack;
 147         int i;
 148
 149         if (!sp)
 150                 stack = task ? (unsigned long *) task->thread.ksp : __r15;
 151         else
 152                 stack = sp;
 153
 154         for (i = 0; i < kstack_depth_to_print; i++) {
 155                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
 156                         break;
 157                 if (i && ((i * sizeof (long) % 32) == 0))
 158                         printk("\n       ");
 159                 printk("%p ", (void *)*stack++);
 160         }
 161         printk("\n");
 162         show_trace(task, sp);
 163 }
 164
 165 /*
 166  * The architecture-independent dump_stack generator
 167  */
 168 void dump_stack(void)
 169 {
 170         printk("CPU: %d %s %s %.*s\n",
 171                task_thread_info(current)->cpu, print_tainted(),
 172                init_utsname()->release,
 173                (int)strcspn(init_utsname()->version, " "),
 174                init_utsname()->version);
 175         printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
 176                current->comm, current->pid, current,
 177                (void *) current->thread.ksp);
 178         show_stack(NULL, NULL);
 179 }
 180 EXPORT_SYMBOL(dump_stack);
 181
 182 static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
 183 {
 184         return (regs->psw.mask & bits) / ((~bits + 1) & bits);
 185 }
 186
 187 void show_registers(struct pt_regs *regs)
 188 {
 189         char *mode;
 190
 191         mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
 192         printk("%s PSW : %p %p",
 193                mode, (void *) regs->psw.mask,
 194                (void *) regs->psw.addr);
 195         print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
 196         printk("           R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
 197                "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
 198                mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
 199                mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
 200                mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
 201                mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
 202                mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
 203 #ifdef CONFIG_64BIT
 204         printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS));
 205 #endif
 206         printk("\n%s GPRS: " FOURLONG, mode,
 207                regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
 208         printk("           " FOURLONG,
 209                regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
 210         printk("           " FOURLONG,
 211                regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
 212         printk("           " FOURLONG,
 213                regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
 214
 215         show_code(regs);
 216 }
 217
 218 /* This is called from fs/proc/array.c */
 219 void task_show_regs(struct seq_file *m, struct task_struct *task)
 220 {
 221         struct pt_regs *regs;
 222
 223         regs = task_pt_regs(task);
 224         seq_printf(m, "task: %p, ksp: %p\n",
 225                        task, (void *)task->thread.ksp);
 226         seq_printf(m, "User PSW : %p %p\n",
 227                        (void *) regs->psw.mask, (void *)regs->psw.addr);
 228
 229         seq_printf(m, "User GPRS: " FOURLONG,
 230                           regs->gprs[0], regs->gprs[1],
 231                           regs->gprs[2], regs->gprs[3]);
 232         seq_printf(m, "           " FOURLONG,
 233                           regs->gprs[4], regs->gprs[5],
 234                           regs->gprs[6], regs->gprs[7]);
 235         seq_printf(m, "           " FOURLONG,
 236                           regs->gprs[8], regs->gprs[9],
 237                           regs->gprs[10], regs->gprs[11]);
 238         seq_printf(m, "           " FOURLONG,
 239                           regs->gprs[12], regs->gprs[13],
 240                           regs->gprs[14], regs->gprs[15]);
 241         seq_printf(m, "User ACRS: %08x %08x %08x %08x\n",
 242                           task->thread.acrs[0], task->thread.acrs[1],
 243                           task->thread.acrs[2], task->thread.acrs[3]);
 244         seq_printf(m, "           %08x %08x %08x %08x\n",
 245                           task->thread.acrs[4], task->thread.acrs[5],
 246                           task->thread.acrs[6], task->thread.acrs[7]);
 247         seq_printf(m, "           %08x %08x %08x %08x\n",
 248                           task->thread.acrs[8], task->thread.acrs[9],
 249                           task->thread.acrs[10], task->thread.acrs[11]);
 250         seq_printf(m, "           %08x %08x %08x %08x\n",
 251                           task->thread.acrs[12], task->thread.acrs[13],
 252                           task->thread.acrs[14], task->thread.acrs[15]);
 253 }
 254
 255 static DEFINE_SPINLOCK(die_lock);
 256
 257 void die(const char * str, struct pt_regs * regs, long err)
 258 {
 259         static int die_counter;
 260
 261         oops_enter();
 262         debug_stop_all();
 263         console_verbose();
 264         spin_lock_irq(&die_lock);
 265         bust_spinlocks(1);
 266         printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
 267 #ifdef CONFIG_PREEMPT
 268         printk("PREEMPT ");
 269 #endif
 270 #ifdef CONFIG_SMP
 271         printk("SMP ");
 272 #endif
 273 #ifdef CONFIG_DEBUG_PAGEALLOC
 274         printk("DEBUG_PAGEALLOC");
 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] = &divide_exception;
 719         pgm_check_table[0x0A] = &overflow_exception;
 720         pgm_check_table[0x0B] = &divide_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_asce_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         pfault_irq_init();
 739 }