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 #include <linux/reboot.h> 33 34 #include <asm/system.h> 35 #include <asm/uaccess.h> 36 #include <asm/io.h> 37 #include <asm/atomic.h> 38 #include <asm/mathemu.h> 39 #include <asm/cpcmd.h> 40 #include <asm/s390_ext.h> 41 #include <asm/lowcore.h> 42 #include <asm/debug.h> 43 44 /* Called from entry.S only */ 45 extern void handle_per_exception(struct pt_regs *regs); 46 47 typedef void pgm_check_handler_t(struct pt_regs *, long); 48 pgm_check_handler_t *pgm_check_table[128]; 49 50 #ifdef CONFIG_SYSCTL 51 #ifdef CONFIG_PROCESS_DEBUG 52 int sysctl_userprocess_debug = 1; 53 #else 54 int sysctl_userprocess_debug = 0; 55 #endif 56 #endif 57 58 extern pgm_check_handler_t do_protection_exception; 59 extern pgm_check_handler_t do_dat_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 extern pgm_check_handler_t do_monitor_call; 68 69 #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; }) 70 71 #ifndef CONFIG_ARCH_S390X 72 #define FOURLONG "%08lx %08lx %08lx %08lx\n" 73 static int kstack_depth_to_print = 12; 74 #else /* CONFIG_ARCH_S390X */ 75 #define FOURLONG "%016lx %016lx %016lx %016lx\n" 76 static int kstack_depth_to_print = 20; 77 #endif /* CONFIG_ARCH_S390X */ 78 79 /* 80 * For show_trace we have tree different stack to consider: 81 * - the panic stack which is used if the kernel stack has overflown 82 * - the asynchronous interrupt stack (cpu related) 83 * - the synchronous kernel stack (process related) 84 * The stack trace can start at any of the three stack and can potentially 85 * touch all of them. The order is: panic stack, async stack, sync stack. 86 */ 87 static unsigned long 88 __show_trace(unsigned long sp, unsigned long low, unsigned long high) 89 { 90 struct stack_frame *sf; 91 struct pt_regs *regs; 92 93 while (1) { 94 sp = sp & PSW_ADDR_INSN; 95 if (sp < low || sp > high - sizeof(*sf)) 96 return sp; 97 sf = (struct stack_frame *) sp; 98 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 99 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); 100 /* Follow the backchain. */ 101 while (1) { 102 low = sp; 103 sp = sf->back_chain & PSW_ADDR_INSN; 104 if (!sp) 105 break; 106 if (sp <= low || sp > high - sizeof(*sf)) 107 return sp; 108 sf = (struct stack_frame *) sp; 109 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); 110 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); 111 } 112 /* Zero backchain detected, check for interrupt frame. */ 113 sp = (unsigned long) (sf + 1); 114 if (sp <= low || sp > high - sizeof(*regs)) 115 return sp; 116 regs = (struct pt_regs *) sp; 117 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); 118 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); 119 low = sp; 120 sp = regs->gprs[15]; 121 } 122 } 123 124 void show_trace(struct task_struct *task, unsigned long * stack) 125 { 126 register unsigned long __r15 asm ("15"); 127 unsigned long sp; 128 129 sp = (unsigned long) stack; 130 if (!sp) 131 sp = task ? task->thread.ksp : __r15; 132 printk("Call Trace:\n"); 133 #ifdef CONFIG_CHECK_STACK 134 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, 135 S390_lowcore.panic_stack); 136 #endif 137 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, 138 S390_lowcore.async_stack); 139 if (task) 140 __show_trace(sp, (unsigned long) task->thread_info, 141 (unsigned long) task->thread_info + THREAD_SIZE); 142 else 143 __show_trace(sp, S390_lowcore.thread_info, 144 S390_lowcore.thread_info + THREAD_SIZE); 145 printk("\n"); 146 } 147 148 void show_stack(struct task_struct *task, unsigned long *sp) 149 { 150 register unsigned long * __r15 asm ("15"); 151 unsigned long *stack; 152 int i; 153 154 // debugging aid: "show_stack(NULL);" prints the 155 // back trace for this cpu. 156 157 if (!sp) 158 sp = task ? (unsigned long *) task->thread.ksp : __r15; 159 160 stack = sp; 161 for (i = 0; i < kstack_depth_to_print; i++) { 162 if (((addr_t) stack & (THREAD_SIZE-1)) == 0) 163 break; 164 if (i && ((i * sizeof (long) % 32) == 0)) 165 printk("\n "); 166 printk("%p ", (void *)*stack++); 167 } 168 printk("\n"); 169 show_trace(task, sp); 170 } 171 172 /* 173 * The architecture-independent dump_stack generator 174 */ 175 void dump_stack(void) 176 { 177 show_stack(0, 0); 178 } 179 180 EXPORT_SYMBOL(dump_stack); 181 182 void show_registers(struct pt_regs *regs) 183 { 184 mm_segment_t old_fs; 185 char *mode; 186 int i; 187 188 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl"; 189 printk("%s PSW : %p %p", 190 mode, (void *) regs->psw.mask, 191 (void *) regs->psw.addr); 192 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); 193 printk("%s GPRS: " FOURLONG, mode, 194 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); 195 printk(" " FOURLONG, 196 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); 197 printk(" " FOURLONG, 198 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); 199 printk(" " FOURLONG, 200 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); 201 202 #if 0 203 /* FIXME: this isn't needed any more but it changes the ksymoops 204 * input. To remove or not to remove ... */ 205 save_access_regs(regs->acrs); 206 printk("%s ACRS: %08x %08x %08x %08x\n", mode, 207 regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]); 208 printk(" %08x %08x %08x %08x\n", 209 regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]); 210 printk(" %08x %08x %08x %08x\n", 211 regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]); 212 printk(" %08x %08x %08x %08x\n", 213 regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]); 214 #endif 215 216 /* 217 * Print the first 20 byte of the instruction stream at the 218 * time of the fault. 219 */ 220 old_fs = get_fs(); 221 if (regs->psw.mask & PSW_MASK_PSTATE) 222 set_fs(USER_DS); 223 else 224 set_fs(KERNEL_DS); 225 printk("%s Code: ", mode); 226 for (i = 0; i < 20; i++) { 227 unsigned char c; 228 if (__get_user(c, (char __user *)(regs->psw.addr + i))) { 229 printk(" Bad PSW."); 230 break; 231 } 232 printk("%02x ", c); 233 } 234 set_fs(old_fs); 235 236 printk("\n"); 237 } 238 239 /* This is called from fs/proc/array.c */ 240 char *task_show_regs(struct task_struct *task, char *buffer) 241 { 242 struct pt_regs *regs; 243 244 regs = __KSTK_PTREGS(task); 245 buffer += sprintf(buffer, "task: %p, ksp: %p\n", 246 task, (void *)task->thread.ksp); 247 buffer += sprintf(buffer, "User PSW : %p %p\n", 248 (void *) regs->psw.mask, (void *)regs->psw.addr); 249 250 buffer += sprintf(buffer, "User GPRS: " FOURLONG, 251 regs->gprs[0], regs->gprs[1], 252 regs->gprs[2], regs->gprs[3]); 253 buffer += sprintf(buffer, " " FOURLONG, 254 regs->gprs[4], regs->gprs[5], 255 regs->gprs[6], regs->gprs[7]); 256 buffer += sprintf(buffer, " " FOURLONG, 257 regs->gprs[8], regs->gprs[9], 258 regs->gprs[10], regs->gprs[11]); 259 buffer += sprintf(buffer, " " FOURLONG, 260 regs->gprs[12], regs->gprs[13], 261 regs->gprs[14], regs->gprs[15]); 262 buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n", 263 task->thread.acrs[0], task->thread.acrs[1], 264 task->thread.acrs[2], task->thread.acrs[3]); 265 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 266 task->thread.acrs[4], task->thread.acrs[5], 267 task->thread.acrs[6], task->thread.acrs[7]); 268 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 269 task->thread.acrs[8], task->thread.acrs[9], 270 task->thread.acrs[10], task->thread.acrs[11]); 271 buffer += sprintf(buffer, " %08x %08x %08x %08x\n", 272 task->thread.acrs[12], task->thread.acrs[13], 273 task->thread.acrs[14], task->thread.acrs[15]); 274 return buffer; 275 } 276 277 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 debug_stop_all(); 284 console_verbose(); 285 spin_lock_irq(&die_lock); 286 bust_spinlocks(1); 287 printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); 288 show_regs(regs); 289 bust_spinlocks(0); 290 spin_unlock_irq(&die_lock); 291 if (in_interrupt()) 292 panic("Fatal exception in interrupt"); 293 if (panic_on_oops) 294 panic("Fatal exception: panic_on_oops"); 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 static void inline do_trap(long interruption_code, int signr, char *str, 313 struct pt_regs *regs, siginfo_t *info) 314 { 315 /* 316 * We got all needed information from the lowcore and can 317 * now safely switch on interrupts. 318 */ 319 if (regs->psw.mask & PSW_MASK_PSTATE) 320 local_irq_enable(); 321 322 if (regs->psw.mask & PSW_MASK_PSTATE) { 323 struct task_struct *tsk = current; 324 325 tsk->thread.trap_no = interruption_code & 0xffff; 326 force_sig_info(signr, info, tsk); 327 report_user_fault(interruption_code, regs); 328 } else { 329 const struct exception_table_entry *fixup; 330 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 331 if (fixup) 332 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; 333 else 334 die(str, regs, interruption_code); 335 } 336 } 337 338 static inline void *get_check_address(struct pt_regs *regs) 339 { 340 return (void *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); 341 } 342 343 void do_single_step(struct pt_regs *regs) 344 { 345 if ((current->ptrace & PT_PTRACED) != 0) 346 force_sig(SIGTRAP, current); 347 } 348 349 asmlinkage void 350 default_trap_handler(struct pt_regs * regs, long interruption_code) 351 { 352 if (regs->psw.mask & PSW_MASK_PSTATE) { 353 local_irq_enable(); 354 do_exit(SIGSEGV); 355 report_user_fault(interruption_code, regs); 356 } else 357 die("Unknown program exception", regs, interruption_code); 358 } 359 360 #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ 361 asmlinkage void name(struct pt_regs * regs, long interruption_code) \ 362 { \ 363 siginfo_t info; \ 364 info.si_signo = signr; \ 365 info.si_errno = 0; \ 366 info.si_code = sicode; \ 367 info.si_addr = (void *)siaddr; \ 368 do_trap(interruption_code, signr, str, regs, &info); \ 369 } 370 371 DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, 372 ILL_ILLADR, get_check_address(regs)) 373 DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, 374 ILL_ILLOPN, get_check_address(regs)) 375 DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, 376 FPE_INTDIV, get_check_address(regs)) 377 DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, 378 FPE_INTOVF, get_check_address(regs)) 379 DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, 380 FPE_FLTOVF, get_check_address(regs)) 381 DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, 382 FPE_FLTUND, get_check_address(regs)) 383 DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, 384 FPE_FLTRES, get_check_address(regs)) 385 DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, 386 FPE_FLTDIV, get_check_address(regs)) 387 DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, 388 FPE_FLTINV, get_check_address(regs)) 389 DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, 390 ILL_ILLOPN, get_check_address(regs)) 391 DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, 392 ILL_PRVOPC, get_check_address(regs)) 393 DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, 394 ILL_ILLOPN, get_check_address(regs)) 395 DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, 396 ILL_ILLOPN, get_check_address(regs)) 397 398 static inline void 399 do_fp_trap(struct pt_regs *regs, void *location, 400 int fpc, long interruption_code) 401 { 402 siginfo_t si; 403 404 si.si_signo = SIGFPE; 405 si.si_errno = 0; 406 si.si_addr = location; 407 si.si_code = 0; 408 /* FPC[2] is Data Exception Code */ 409 if ((fpc & 0x00000300) == 0) { 410 /* bits 6 and 7 of DXC are 0 iff IEEE exception */ 411 if (fpc & 0x8000) /* invalid fp operation */ 412 si.si_code = FPE_FLTINV; 413 else if (fpc & 0x4000) /* div by 0 */ 414 si.si_code = FPE_FLTDIV; 415 else if (fpc & 0x2000) /* overflow */ 416 si.si_code = FPE_FLTOVF; 417 else if (fpc & 0x1000) /* underflow */ 418 si.si_code = FPE_FLTUND; 419 else if (fpc & 0x0800) /* inexact */ 420 si.si_code = FPE_FLTRES; 421 } 422 current->thread.ieee_instruction_pointer = (addr_t) location; 423 do_trap(interruption_code, SIGFPE, 424 "floating point exception", regs, &si); 425 } 426 427 asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code) 428 { 429 siginfo_t info; 430 __u8 opcode[6]; 431 __u16 *location; 432 int signal = 0; 433 434 location = (__u16 *) get_check_address(regs); 435 436 /* 437 * We got all needed information from the lowcore and can 438 * now safely switch on interrupts. 439 */ 440 if (regs->psw.mask & PSW_MASK_PSTATE) 441 local_irq_enable(); 442 443 if (regs->psw.mask & PSW_MASK_PSTATE) { 444 get_user(*((__u16 *) opcode), (__u16 __user *) location); 445 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { 446 if (current->ptrace & PT_PTRACED) 447 force_sig(SIGTRAP, current); 448 else 449 signal = SIGILL; 450 #ifdef CONFIG_MATHEMU 451 } else if (opcode[0] == 0xb3) { 452 get_user(*((__u16 *) (opcode+2)), location+1); 453 signal = math_emu_b3(opcode, regs); 454 } else if (opcode[0] == 0xed) { 455 get_user(*((__u32 *) (opcode+2)), 456 (__u32 *)(location+1)); 457 signal = math_emu_ed(opcode, regs); 458 } else if (*((__u16 *) opcode) == 0xb299) { 459 get_user(*((__u16 *) (opcode+2)), location+1); 460 signal = math_emu_srnm(opcode, regs); 461 } else if (*((__u16 *) opcode) == 0xb29c) { 462 get_user(*((__u16 *) (opcode+2)), location+1); 463 signal = math_emu_stfpc(opcode, regs); 464 } else if (*((__u16 *) opcode) == 0xb29d) { 465 get_user(*((__u16 *) (opcode+2)), location+1); 466 signal = math_emu_lfpc(opcode, regs); 467 #endif 468 } else 469 signal = SIGILL; 470 } else 471 signal = SIGILL; 472 473 #ifdef CONFIG_MATHEMU 474 if (signal == SIGFPE) 475 do_fp_trap(regs, location, 476 current->thread.fp_regs.fpc, interruption_code); 477 else if (signal == SIGSEGV) { 478 info.si_signo = signal; 479 info.si_errno = 0; 480 info.si_code = SEGV_MAPERR; 481 info.si_addr = (void *) location; 482 do_trap(interruption_code, signal, 483 "user address fault", regs, &info); 484 } else 485 #endif 486 if (signal) { 487 info.si_signo = signal; 488 info.si_errno = 0; 489 info.si_code = ILL_ILLOPC; 490 info.si_addr = (void *) location; 491 do_trap(interruption_code, signal, 492 "illegal operation", regs, &info); 493 } 494 } 495 496 497 #ifdef CONFIG_MATHEMU 498 asmlinkage void 499 specification_exception(struct pt_regs * regs, long interruption_code) 500 { 501 __u8 opcode[6]; 502 __u16 *location = NULL; 503 int signal = 0; 504 505 location = (__u16 *) get_check_address(regs); 506 507 /* 508 * We got all needed information from the lowcore and can 509 * now safely switch on interrupts. 510 */ 511 if (regs->psw.mask & PSW_MASK_PSTATE) 512 local_irq_enable(); 513 514 if (regs->psw.mask & PSW_MASK_PSTATE) { 515 get_user(*((__u16 *) opcode), location); 516 switch (opcode[0]) { 517 case 0x28: /* LDR Rx,Ry */ 518 signal = math_emu_ldr(opcode); 519 break; 520 case 0x38: /* LER Rx,Ry */ 521 signal = math_emu_ler(opcode); 522 break; 523 case 0x60: /* STD R,D(X,B) */ 524 get_user(*((__u16 *) (opcode+2)), location+1); 525 signal = math_emu_std(opcode, regs); 526 break; 527 case 0x68: /* LD R,D(X,B) */ 528 get_user(*((__u16 *) (opcode+2)), location+1); 529 signal = math_emu_ld(opcode, regs); 530 break; 531 case 0x70: /* STE R,D(X,B) */ 532 get_user(*((__u16 *) (opcode+2)), location+1); 533 signal = math_emu_ste(opcode, regs); 534 break; 535 case 0x78: /* LE R,D(X,B) */ 536 get_user(*((__u16 *) (opcode+2)), location+1); 537 signal = math_emu_le(opcode, regs); 538 break; 539 default: 540 signal = SIGILL; 541 break; 542 } 543 } else 544 signal = SIGILL; 545 546 if (signal == SIGFPE) 547 do_fp_trap(regs, location, 548 current->thread.fp_regs.fpc, interruption_code); 549 else if (signal) { 550 siginfo_t info; 551 info.si_signo = signal; 552 info.si_errno = 0; 553 info.si_code = ILL_ILLOPN; 554 info.si_addr = location; 555 do_trap(interruption_code, signal, 556 "specification exception", regs, &info); 557 } 558 } 559 #else 560 DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 561 ILL_ILLOPN, get_check_address(regs)); 562 #endif 563 564 asmlinkage void data_exception(struct pt_regs * regs, long interruption_code) 565 { 566 __u16 *location; 567 int signal = 0; 568 569 location = (__u16 *) get_check_address(regs); 570 571 /* 572 * We got all needed information from the lowcore and can 573 * now safely switch on interrupts. 574 */ 575 if (regs->psw.mask & PSW_MASK_PSTATE) 576 local_irq_enable(); 577 578 if (MACHINE_HAS_IEEE) 579 __asm__ volatile ("stfpc %0\n\t" 580 : "=m" (current->thread.fp_regs.fpc)); 581 582 #ifdef CONFIG_MATHEMU 583 else if (regs->psw.mask & PSW_MASK_PSTATE) { 584 __u8 opcode[6]; 585 get_user(*((__u16 *) opcode), location); 586 switch (opcode[0]) { 587 case 0x28: /* LDR Rx,Ry */ 588 signal = math_emu_ldr(opcode); 589 break; 590 case 0x38: /* LER Rx,Ry */ 591 signal = math_emu_ler(opcode); 592 break; 593 case 0x60: /* STD R,D(X,B) */ 594 get_user(*((__u16 *) (opcode+2)), location+1); 595 signal = math_emu_std(opcode, regs); 596 break; 597 case 0x68: /* LD R,D(X,B) */ 598 get_user(*((__u16 *) (opcode+2)), location+1); 599 signal = math_emu_ld(opcode, regs); 600 break; 601 case 0x70: /* STE R,D(X,B) */ 602 get_user(*((__u16 *) (opcode+2)), location+1); 603 signal = math_emu_ste(opcode, regs); 604 break; 605 case 0x78: /* LE R,D(X,B) */ 606 get_user(*((__u16 *) (opcode+2)), location+1); 607 signal = math_emu_le(opcode, regs); 608 break; 609 case 0xb3: 610 get_user(*((__u16 *) (opcode+2)), location+1); 611 signal = math_emu_b3(opcode, regs); 612 break; 613 case 0xed: 614 get_user(*((__u32 *) (opcode+2)), 615 (__u32 *)(location+1)); 616 signal = math_emu_ed(opcode, regs); 617 break; 618 case 0xb2: 619 if (opcode[1] == 0x99) { 620 get_user(*((__u16 *) (opcode+2)), location+1); 621 signal = math_emu_srnm(opcode, regs); 622 } else if (opcode[1] == 0x9c) { 623 get_user(*((__u16 *) (opcode+2)), location+1); 624 signal = math_emu_stfpc(opcode, regs); 625 } else if (opcode[1] == 0x9d) { 626 get_user(*((__u16 *) (opcode+2)), location+1); 627 signal = math_emu_lfpc(opcode, regs); 628 } else 629 signal = SIGILL; 630 break; 631 default: 632 signal = SIGILL; 633 break; 634 } 635 } 636 #endif 637 if (current->thread.fp_regs.fpc & FPC_DXC_MASK) 638 signal = SIGFPE; 639 else 640 signal = SIGILL; 641 if (signal == SIGFPE) 642 do_fp_trap(regs, location, 643 current->thread.fp_regs.fpc, interruption_code); 644 else if (signal) { 645 siginfo_t info; 646 info.si_signo = signal; 647 info.si_errno = 0; 648 info.si_code = ILL_ILLOPN; 649 info.si_addr = location; 650 do_trap(interruption_code, signal, 651 "data exception", regs, &info); 652 } 653 } 654 655 asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code) 656 { 657 siginfo_t info; 658 659 /* Set user psw back to home space mode. */ 660 if (regs->psw.mask & PSW_MASK_PSTATE) 661 regs->psw.mask |= PSW_ASC_HOME; 662 /* Send SIGILL. */ 663 info.si_signo = SIGILL; 664 info.si_errno = 0; 665 info.si_code = ILL_PRVOPC; 666 info.si_addr = get_check_address(regs); 667 do_trap(int_code, SIGILL, "space switch event", regs, &info); 668 } 669 670 asmlinkage void kernel_stack_overflow(struct pt_regs * regs) 671 { 672 bust_spinlocks(1); 673 printk("Kernel stack overflow.\n"); 674 show_regs(regs); 675 bust_spinlocks(0); 676 panic("Corrupt kernel stack, can't continue."); 677 } 678 679 #ifndef CONFIG_ARCH_S390X 680 static int 681 pagex_reboot_event(struct notifier_block *this, unsigned long event, void *ptr) 682 { 683 if (MACHINE_IS_VM) 684 cpcmd("SET PAGEX OFF", NULL, 0, NULL); 685 return NOTIFY_DONE; 686 } 687 688 static struct notifier_block pagex_reboot_notifier = { 689 .notifier_call = &pagex_reboot_event, 690 }; 691 #endif 692 693 /* init is done in lowcore.S and head.S */ 694 695 void __init trap_init(void) 696 { 697 int i; 698 699 for (i = 0; i < 128; i++) 700 pgm_check_table[i] = &default_trap_handler; 701 pgm_check_table[1] = &illegal_op; 702 pgm_check_table[2] = &privileged_op; 703 pgm_check_table[3] = &execute_exception; 704 pgm_check_table[4] = &do_protection_exception; 705 pgm_check_table[5] = &addressing_exception; 706 pgm_check_table[6] = &specification_exception; 707 pgm_check_table[7] = &data_exception; 708 pgm_check_table[8] = &overflow_exception; 709 pgm_check_table[9] = ÷_exception; 710 pgm_check_table[0x0A] = &overflow_exception; 711 pgm_check_table[0x0B] = ÷_exception; 712 pgm_check_table[0x0C] = &hfp_overflow_exception; 713 pgm_check_table[0x0D] = &hfp_underflow_exception; 714 pgm_check_table[0x0E] = &hfp_significance_exception; 715 pgm_check_table[0x0F] = &hfp_divide_exception; 716 pgm_check_table[0x10] = &do_dat_exception; 717 pgm_check_table[0x11] = &do_dat_exception; 718 pgm_check_table[0x12] = &translation_exception; 719 pgm_check_table[0x13] = &special_op_exception; 720 #ifndef CONFIG_ARCH_S390X 721 pgm_check_table[0x14] = &do_pseudo_page_fault; 722 #else /* CONFIG_ARCH_S390X */ 723 pgm_check_table[0x38] = &do_dat_exception; 724 pgm_check_table[0x39] = &do_dat_exception; 725 pgm_check_table[0x3A] = &do_dat_exception; 726 pgm_check_table[0x3B] = &do_dat_exception; 727 #endif /* CONFIG_ARCH_S390X */ 728 pgm_check_table[0x15] = &operand_exception; 729 pgm_check_table[0x1C] = &space_switch_exception; 730 pgm_check_table[0x1D] = &hfp_sqrt_exception; 731 pgm_check_table[0x40] = &do_monitor_call; 732 733 if (MACHINE_IS_VM) { 734 /* 735 * First try to get pfault pseudo page faults going. 736 * If this isn't available turn on pagex page faults. 737 */ 738 #ifdef CONFIG_PFAULT 739 /* request the 0x2603 external interrupt */ 740 if (register_early_external_interrupt(0x2603, pfault_interrupt, 741 &ext_int_pfault) != 0) 742 panic("Couldn't request external interrupt 0x2603"); 743 744 if (pfault_init() == 0) 745 return; 746 747 /* Tough luck, no pfault. */ 748 unregister_early_external_interrupt(0x2603, pfault_interrupt, 749 &ext_int_pfault); 750 #endif 751 #ifndef CONFIG_ARCH_S390X 752 register_reboot_notifier(&pagex_reboot_notifier); 753 cpcmd("SET PAGEX ON", NULL, 0, NULL); 754 #endif 755 } 756 } 757