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 void __kprobes inline do_trap(long interruption_code, int signr, 333 char *str, struct pt_regs *regs, 334 siginfo_t *info) 335 { 336 /* 337 * We got all needed information from the lowcore and can 338 * now safely switch on interrupts. 339 */ 340 if (regs->psw.mask & PSW_MASK_PSTATE) 341 local_irq_enable(); 342 343 if (notify_die(DIE_TRAP, str, regs, interruption_code, 344 interruption_code, signr) == NOTIFY_STOP) 345 return; 346 347 if (regs->psw.mask & PSW_MASK_PSTATE) { 348 struct task_struct *tsk = current; 349 350 tsk->thread.trap_no = interruption_code & 0xffff; 351 force_sig_info(signr, info, tsk); 352 report_user_fault(regs, interruption_code, signr); 353 } else { 354 const struct exception_table_entry *fixup; 355 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 356 if (fixup) 357 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 358 else { 359 enum bug_trap_type btt; 360 361 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs); 362 if (btt == BUG_TRAP_TYPE_WARN) 363 return; 364 die(str, regs, interruption_code); 365 } 366 } 367 } 368 369 static inline void __user *get_check_address(struct pt_regs *regs) 370 { 371 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); 372 } 373 374 void __kprobes do_single_step(struct pt_regs *regs) 375 { 376 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, 377 SIGTRAP) == NOTIFY_STOP){ 378 return; 379 } 380 if (tracehook_consider_fatal_signal(current, SIGTRAP)) 381 force_sig(SIGTRAP, current); 382 } 383 384 static void default_trap_handler(struct pt_regs * regs, long interruption_code) 385 { 386 if (regs->psw.mask & PSW_MASK_PSTATE) { 387 local_irq_enable(); 388 report_user_fault(regs, interruption_code, SIGSEGV); 389 do_exit(SIGSEGV); 390 } else 391 die("Unknown program exception", regs, interruption_code); 392 } 393 394 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ 395 static void name(struct pt_regs * regs, long interruption_code) \ 396 { \ 397 siginfo_t info; \ 398 info.si_signo = signr; \ 399 info.si_errno = 0; \ 400 info.si_code = sicode; \ 401 info.si_addr = siaddr; \ 402 do_trap(interruption_code, signr, str, regs, &info); \ 403 } 404 405 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, 406 ILL_ILLADR, get_check_address(regs)) 407 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, 408 ILL_ILLOPN, get_check_address(regs)) 409 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, 410 FPE_INTDIV, get_check_address(regs)) 411 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, 412 FPE_INTOVF, get_check_address(regs)) 413 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, 414 FPE_FLTOVF, get_check_address(regs)) 415 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, 416 FPE_FLTUND, get_check_address(regs)) 417 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, 418 FPE_FLTRES, get_check_address(regs)) 419 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, 420 FPE_FLTDIV, get_check_address(regs)) 421 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, 422 FPE_FLTINV, get_check_address(regs)) 423 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, 424 ILL_ILLOPN, get_check_address(regs)) 425 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, 426 ILL_PRVOPC, get_check_address(regs)) 427 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, 428 ILL_ILLOPN, get_check_address(regs)) 429 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, 430 ILL_ILLOPN, get_check_address(regs)) 431 432 static inline void 433 do_fp_trap(struct pt_regs *regs, void __user *location, 434 int fpc, long interruption_code) 435 { 436 siginfo_t si; 437 438 si.si_signo = SIGFPE; 439 si.si_errno = 0; 440 si.si_addr = location; 441 si.si_code = 0; 442 /* FPC[2] is Data Exception Code */ 443 if ((fpc & 0x00000300) == 0) { 444 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 445 if (fpc & 0x8000) /* invalid fp operation */ 446 si.si_code = FPE_FLTINV; 447 else if (fpc & 0x4000) /* div by 0 */ 448 si.si_code = FPE_FLTDIV; 449 else if (fpc & 0x2000) /* overflow */ 450 si.si_code = FPE_FLTOVF; 451 else if (fpc & 0x1000) /* underflow */ 452 si.si_code = FPE_FLTUND; 453 else if (fpc & 0x0800) /* inexact */ 454 si.si_code = FPE_FLTRES; 455 } 456 current->thread.ieee_instruction_pointer = (addr_t) location; 457 do_trap(interruption_code, SIGFPE, 458 "floating point exception", regs, &si); 459 } 460 461 static void illegal_op(struct pt_regs * regs, long interruption_code) 462 { 463 siginfo_t info; 464 __u8 opcode[6]; 465 __u16 __user *location; 466 int signal = 0; 467 468 location = get_check_address(regs); 469 470 /* 471 * We got all needed information from the lowcore and can 472 * now safely switch on interrupts. 473 */ 474 if (regs->psw.mask & PSW_MASK_PSTATE) 475 local_irq_enable(); 476 477 if (regs->psw.mask & PSW_MASK_PSTATE) { 478 if (get_user(*((__u16 *) opcode), (__u16 __user *) location)) 479 return; 480 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { 481 if (tracehook_consider_fatal_signal(current, SIGTRAP)) 482 force_sig(SIGTRAP, current); 483 else 484 signal = SIGILL; 485 #ifdef CONFIG_MATHEMU 486 } else if (opcode[0] == 0xb3) { 487 if (get_user(*((__u16 *) (opcode+2)), location+1)) 488 return; 489 signal = math_emu_b3(opcode, regs); 490 } else if (opcode[0] == 0xed) { 491 if (get_user(*((__u32 *) (opcode+2)), 492 (__u32 __user *)(location+1))) 493 return; 494 signal = math_emu_ed(opcode, regs); 495 } else if (*((__u16 *) opcode) == 0xb299) { 496 if (get_user(*((__u16 *) (opcode+2)), location+1)) 497 return; 498 signal = math_emu_srnm(opcode, regs); 499 } else if (*((__u16 *) opcode) == 0xb29c) { 500 if (get_user(*((__u16 *) (opcode+2)), location+1)) 501 return; 502 signal = math_emu_stfpc(opcode, regs); 503 } else if (*((__u16 *) opcode) == 0xb29d) { 504 if (get_user(*((__u16 *) (opcode+2)), location+1)) 505 return; 506 signal = math_emu_lfpc(opcode, regs); 507 #endif 508 } else 509 signal = SIGILL; 510 } else { 511 /* 512 * If we get an illegal op in kernel mode, send it through the 513 * kprobes notifier. If kprobes doesn't pick it up, SIGILL 514 */ 515 if (notify_die(DIE_BPT, "bpt", regs, interruption_code, 516 3, SIGTRAP) != NOTIFY_STOP) 517 signal = SIGILL; 518 } 519 520 #ifdef CONFIG_MATHEMU 521 if (signal == SIGFPE) 522 do_fp_trap(regs, location, 523 current->thread.fp_regs.fpc, interruption_code); 524 else if (signal == SIGSEGV) { 525 info.si_signo = signal; 526 info.si_errno = 0; 527 info.si_code = SEGV_MAPERR; 528 info.si_addr = (void __user *) location; 529 do_trap(interruption_code, signal, 530 "user address fault", regs, &info); 531 } else 532 #endif 533 if (signal) { 534 info.si_signo = signal; 535 info.si_errno = 0; 536 info.si_code = ILL_ILLOPC; 537 info.si_addr = (void __user *) location; 538 do_trap(interruption_code, signal, 539 "illegal operation", regs, &info); 540 } 541 } 542 543 544 #ifdef CONFIG_MATHEMU 545 asmlinkage void 546 specification_exception(struct pt_regs * regs, long interruption_code) 547 { 548 __u8 opcode[6]; 549 __u16 __user *location = NULL; 550 int signal = 0; 551 552 location = (__u16 __user *) get_check_address(regs); 553 554 /* 555 * We got all needed information from the lowcore and can 556 * now safely switch on interrupts. 557 */ 558 if (regs->psw.mask & PSW_MASK_PSTATE) 559 local_irq_enable(); 560 561 if (regs->psw.mask & PSW_MASK_PSTATE) { 562 get_user(*((__u16 *) opcode), location); 563 switch (opcode[0]) { 564 case 0x28: /* LDR Rx,Ry */ 565 signal = math_emu_ldr(opcode); 566 break; 567 case 0x38: /* LER Rx,Ry */ 568 signal = math_emu_ler(opcode); 569 break; 570 case 0x60: /* STD R,D(X,B) */ 571 get_user(*((__u16 *) (opcode+2)), location+1); 572 signal = math_emu_std(opcode, regs); 573 break; 574 case 0x68: /* LD R,D(X,B) */ 575 get_user(*((__u16 *) (opcode+2)), location+1); 576 signal = math_emu_ld(opcode, regs); 577 break; 578 case 0x70: /* STE R,D(X,B) */ 579 get_user(*((__u16 *) (opcode+2)), location+1); 580 signal = math_emu_ste(opcode, regs); 581 break; 582 case 0x78: /* LE R,D(X,B) */ 583 get_user(*((__u16 *) (opcode+2)), location+1); 584 signal = math_emu_le(opcode, regs); 585 break; 586 default: 587 signal = SIGILL; 588 break; 589 } 590 } else 591 signal = SIGILL; 592 593 if (signal == SIGFPE) 594 do_fp_trap(regs, location, 595 current->thread.fp_regs.fpc, interruption_code); 596 else if (signal) { 597 siginfo_t info; 598 info.si_signo = signal; 599 info.si_errno = 0; 600 info.si_code = ILL_ILLOPN; 601 info.si_addr = location; 602 do_trap(interruption_code, signal, 603 "specification exception", regs, &info); 604 } 605 } 606 #else 607 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 608 ILL_ILLOPN, get_check_address(regs)); 609 #endif 610 611 static void data_exception(struct pt_regs * regs, long interruption_code) 612 { 613 __u16 __user *location; 614 int signal = 0; 615 616 location = get_check_address(regs); 617 618 /* 619 * We got all needed information from the lowcore and can 620 * now safely switch on interrupts. 621 */ 622 if (regs->psw.mask & PSW_MASK_PSTATE) 623 local_irq_enable(); 624 625 if (MACHINE_HAS_IEEE) 626 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc)); 627 628 #ifdef CONFIG_MATHEMU 629 else if (regs->psw.mask & PSW_MASK_PSTATE) { 630 __u8 opcode[6]; 631 get_user(*((__u16 *) opcode), location); 632 switch (opcode[0]) { 633 case 0x28: /* LDR Rx,Ry */ 634 signal = math_emu_ldr(opcode); 635 break; 636 case 0x38: /* LER Rx,Ry */ 637 signal = math_emu_ler(opcode); 638 break; 639 case 0x60: /* STD R,D(X,B) */ 640 get_user(*((__u16 *) (opcode+2)), location+1); 641 signal = math_emu_std(opcode, regs); 642 break; 643 case 0x68: /* LD R,D(X,B) */ 644 get_user(*((__u16 *) (opcode+2)), location+1); 645 signal = math_emu_ld(opcode, regs); 646 break; 647 case 0x70: /* STE R,D(X,B) */ 648 get_user(*((__u16 *) (opcode+2)), location+1); 649 signal = math_emu_ste(opcode, regs); 650 break; 651 case 0x78: /* LE R,D(X,B) */ 652 get_user(*((__u16 *) (opcode+2)), location+1); 653 signal = math_emu_le(opcode, regs); 654 break; 655 case 0xb3: 656 get_user(*((__u16 *) (opcode+2)), location+1); 657 signal = math_emu_b3(opcode, regs); 658 break; 659 case 0xed: 660 get_user(*((__u32 *) (opcode+2)), 661 (__u32 __user *)(location+1)); 662 signal = math_emu_ed(opcode, regs); 663 break; 664 case 0xb2: 665 if (opcode[1] == 0x99) { 666 get_user(*((__u16 *) (opcode+2)), location+1); 667 signal = math_emu_srnm(opcode, regs); 668 } else if (opcode[1] == 0x9c) { 669 get_user(*((__u16 *) (opcode+2)), location+1); 670 signal = math_emu_stfpc(opcode, regs); 671 } else if (opcode[1] == 0x9d) { 672 get_user(*((__u16 *) (opcode+2)), location+1); 673 signal = math_emu_lfpc(opcode, regs); 674 } else 675 signal = SIGILL; 676 break; 677 default: 678 signal = SIGILL; 679 break; 680 } 681 } 682 #endif 683 if (current->thread.fp_regs.fpc & FPC_DXC_MASK) 684 signal = SIGFPE; 685 else 686 signal = SIGILL; 687 if (signal == SIGFPE) 688 do_fp_trap(regs, location, 689 current->thread.fp_regs.fpc, interruption_code); 690 else if (signal) { 691 siginfo_t info; 692 info.si_signo = signal; 693 info.si_errno = 0; 694 info.si_code = ILL_ILLOPN; 695 info.si_addr = location; 696 do_trap(interruption_code, signal, 697 "data exception", regs, &info); 698 } 699 } 700 701 static void space_switch_exception(struct pt_regs * regs, long int_code) 702 { 703 siginfo_t info; 704 705 /* Set user psw back to home space mode. */ 706 if (regs->psw.mask & PSW_MASK_PSTATE) 707 regs->psw.mask |= PSW_ASC_HOME; 708 /* Send SIGILL. */ 709 info.si_signo = SIGILL; 710 info.si_errno = 0; 711 info.si_code = ILL_PRVOPC; 712 info.si_addr = get_check_address(regs); 713 do_trap(int_code, SIGILL, "space switch event", regs, &info); 714 } 715 716 asmlinkage void kernel_stack_overflow(struct pt_regs * regs) 717 { 718 bust_spinlocks(1); 719 printk("Kernel stack overflow.\n"); 720 show_regs(regs); 721 bust_spinlocks(0); 722 panic("Corrupt kernel stack, can't continue."); 723 } 724 725 /* init is done in lowcore.S and head.S */ 726 727 void __init trap_init(void) 728 { 729 int i; 730 731 for (i = 0; i < 128; i++) 732 pgm_check_table[i] = &default_trap_handler; 733 pgm_check_table[1] = &illegal_op; 734 pgm_check_table[2] = &privileged_op; 735 pgm_check_table[3] = &execute_exception; 736 pgm_check_table[4] = &do_protection_exception; 737 pgm_check_table[5] = &addressing_exception; 738 pgm_check_table[6] = &specification_exception; 739 pgm_check_table[7] = &data_exception; 740 pgm_check_table[8] = &overflow_exception; 741 pgm_check_table[9] = ÷_exception; 742 pgm_check_table[0x0A] = &overflow_exception; 743 pgm_check_table[0x0B] = ÷_exception; 744 pgm_check_table[0x0C] = &hfp_overflow_exception; 745 pgm_check_table[0x0D] = &hfp_underflow_exception; 746 pgm_check_table[0x0E] = &hfp_significance_exception; 747 pgm_check_table[0x0F] = &hfp_divide_exception; 748 pgm_check_table[0x10] = &do_dat_exception; 749 pgm_check_table[0x11] = &do_dat_exception; 750 pgm_check_table[0x12] = &translation_exception; 751 pgm_check_table[0x13] = &special_op_exception; 752 #ifdef CONFIG_64BIT 753 pgm_check_table[0x38] = &do_asce_exception; 754 pgm_check_table[0x39] = &do_dat_exception; 755 pgm_check_table[0x3A] = &do_dat_exception; 756 pgm_check_table[0x3B] = &do_dat_exception; 757 #endif /* CONFIG_64BIT */ 758 pgm_check_table[0x15] = &operand_exception; 759 pgm_check_table[0x1C] = &space_switch_exception; 760 pgm_check_table[0x1D] = &hfp_sqrt_exception; 761 pfault_irq_init(); 762 } 763