Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/smp_lock.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/kallsyms.h> |
Heiko Carstens | 5d3f229 | 2005-08-01 21:11:33 -0700 | [diff] [blame] | 31 | #include <linux/reboot.h> |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 32 | #include <linux/kprobes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 43 | #include <asm/kdebug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* Called from entry.S only */ |
| 46 | extern void handle_per_exception(struct pt_regs *regs); |
| 47 | |
| 48 | typedef void pgm_check_handler_t(struct pt_regs *, long); |
| 49 | pgm_check_handler_t *pgm_check_table[128]; |
| 50 | |
| 51 | #ifdef CONFIG_SYSCTL |
| 52 | #ifdef CONFIG_PROCESS_DEBUG |
| 53 | int sysctl_userprocess_debug = 1; |
| 54 | #else |
| 55 | int sysctl_userprocess_debug = 0; |
| 56 | #endif |
| 57 | #endif |
| 58 | |
| 59 | extern pgm_check_handler_t do_protection_exception; |
| 60 | extern pgm_check_handler_t do_dat_exception; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 71 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #define FOURLONG "%08lx %08lx %08lx %08lx\n" |
| 73 | static int kstack_depth_to_print = 12; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 74 | #else /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #define FOURLONG "%016lx %016lx %016lx %016lx\n" |
| 76 | static int kstack_depth_to_print = 20; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 77 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 79 | ATOMIC_NOTIFIER_HEAD(s390die_chain); |
| 80 | |
| 81 | int register_die_notifier(struct notifier_block *nb) |
| 82 | { |
| 83 | return atomic_notifier_chain_register(&s390die_chain, nb); |
| 84 | } |
| 85 | EXPORT_SYMBOL(register_die_notifier); |
| 86 | |
| 87 | int unregister_die_notifier(struct notifier_block *nb) |
| 88 | { |
| 89 | return atomic_notifier_chain_unregister(&s390die_chain, nb); |
| 90 | } |
| 91 | EXPORT_SYMBOL(unregister_die_notifier); |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | /* |
| 94 | * For show_trace we have tree different stack to consider: |
| 95 | * - the panic stack which is used if the kernel stack has overflown |
| 96 | * - the asynchronous interrupt stack (cpu related) |
| 97 | * - the synchronous kernel stack (process related) |
| 98 | * The stack trace can start at any of the three stack and can potentially |
| 99 | * touch all of them. The order is: panic stack, async stack, sync stack. |
| 100 | */ |
| 101 | static unsigned long |
| 102 | __show_trace(unsigned long sp, unsigned long low, unsigned long high) |
| 103 | { |
| 104 | struct stack_frame *sf; |
| 105 | struct pt_regs *regs; |
| 106 | |
| 107 | while (1) { |
| 108 | sp = sp & PSW_ADDR_INSN; |
| 109 | if (sp < low || sp > high - sizeof(*sf)) |
| 110 | return sp; |
| 111 | sf = (struct stack_frame *) sp; |
| 112 | printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); |
| 113 | print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); |
| 114 | /* Follow the backchain. */ |
| 115 | while (1) { |
| 116 | low = sp; |
| 117 | sp = sf->back_chain & PSW_ADDR_INSN; |
| 118 | if (!sp) |
| 119 | break; |
| 120 | if (sp <= low || sp > high - sizeof(*sf)) |
| 121 | return sp; |
| 122 | sf = (struct stack_frame *) sp; |
| 123 | printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); |
| 124 | print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); |
| 125 | } |
| 126 | /* Zero backchain detected, check for interrupt frame. */ |
| 127 | sp = (unsigned long) (sf + 1); |
| 128 | if (sp <= low || sp > high - sizeof(*regs)) |
| 129 | return sp; |
| 130 | regs = (struct pt_regs *) sp; |
| 131 | printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); |
| 132 | print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); |
| 133 | low = sp; |
| 134 | sp = regs->gprs[15]; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | void show_trace(struct task_struct *task, unsigned long * stack) |
| 139 | { |
| 140 | register unsigned long __r15 asm ("15"); |
| 141 | unsigned long sp; |
| 142 | |
| 143 | sp = (unsigned long) stack; |
| 144 | if (!sp) |
| 145 | sp = task ? task->thread.ksp : __r15; |
| 146 | printk("Call Trace:\n"); |
| 147 | #ifdef CONFIG_CHECK_STACK |
| 148 | sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, |
| 149 | S390_lowcore.panic_stack); |
| 150 | #endif |
| 151 | sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, |
| 152 | S390_lowcore.async_stack); |
| 153 | if (task) |
Al Viro | 30af712 | 2006-01-12 01:05:50 -0800 | [diff] [blame] | 154 | __show_trace(sp, (unsigned long) task_stack_page(task), |
| 155 | (unsigned long) task_stack_page(task) + THREAD_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | else |
| 157 | __show_trace(sp, S390_lowcore.thread_info, |
| 158 | S390_lowcore.thread_info + THREAD_SIZE); |
| 159 | printk("\n"); |
| 160 | } |
| 161 | |
| 162 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 163 | { |
| 164 | register unsigned long * __r15 asm ("15"); |
| 165 | unsigned long *stack; |
| 166 | int i; |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | if (!sp) |
Heiko Carstens | 7380534 | 2006-06-29 14:56:23 +0200 | [diff] [blame] | 169 | stack = task ? (unsigned long *) task->thread.ksp : __r15; |
| 170 | else |
| 171 | stack = sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | for (i = 0; i < kstack_depth_to_print; i++) { |
| 174 | if (((addr_t) stack & (THREAD_SIZE-1)) == 0) |
| 175 | break; |
| 176 | if (i && ((i * sizeof (long) % 32) == 0)) |
| 177 | printk("\n "); |
| 178 | printk("%p ", (void *)*stack++); |
| 179 | } |
| 180 | printk("\n"); |
| 181 | show_trace(task, sp); |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * The architecture-independent dump_stack generator |
| 186 | */ |
| 187 | void dump_stack(void) |
| 188 | { |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 189 | show_stack(NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | EXPORT_SYMBOL(dump_stack); |
| 193 | |
| 194 | void show_registers(struct pt_regs *regs) |
| 195 | { |
| 196 | mm_segment_t old_fs; |
| 197 | char *mode; |
| 198 | int i; |
| 199 | |
| 200 | mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl"; |
| 201 | printk("%s PSW : %p %p", |
| 202 | mode, (void *) regs->psw.mask, |
| 203 | (void *) regs->psw.addr); |
| 204 | print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); |
| 205 | printk("%s GPRS: " FOURLONG, mode, |
| 206 | regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); |
| 207 | printk(" " FOURLONG, |
| 208 | regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); |
| 209 | printk(" " FOURLONG, |
| 210 | regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); |
| 211 | printk(" " FOURLONG, |
| 212 | regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); |
| 213 | |
| 214 | #if 0 |
| 215 | /* FIXME: this isn't needed any more but it changes the ksymoops |
| 216 | * input. To remove or not to remove ... */ |
| 217 | save_access_regs(regs->acrs); |
| 218 | printk("%s ACRS: %08x %08x %08x %08x\n", mode, |
| 219 | regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]); |
| 220 | printk(" %08x %08x %08x %08x\n", |
| 221 | regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]); |
| 222 | printk(" %08x %08x %08x %08x\n", |
| 223 | regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]); |
| 224 | printk(" %08x %08x %08x %08x\n", |
| 225 | regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]); |
| 226 | #endif |
| 227 | |
| 228 | /* |
| 229 | * Print the first 20 byte of the instruction stream at the |
| 230 | * time of the fault. |
| 231 | */ |
| 232 | old_fs = get_fs(); |
| 233 | if (regs->psw.mask & PSW_MASK_PSTATE) |
| 234 | set_fs(USER_DS); |
| 235 | else |
| 236 | set_fs(KERNEL_DS); |
| 237 | printk("%s Code: ", mode); |
| 238 | for (i = 0; i < 20; i++) { |
| 239 | unsigned char c; |
| 240 | if (__get_user(c, (char __user *)(regs->psw.addr + i))) { |
| 241 | printk(" Bad PSW."); |
| 242 | break; |
| 243 | } |
| 244 | printk("%02x ", c); |
| 245 | } |
| 246 | set_fs(old_fs); |
| 247 | |
| 248 | printk("\n"); |
| 249 | } |
| 250 | |
| 251 | /* This is called from fs/proc/array.c */ |
| 252 | char *task_show_regs(struct task_struct *task, char *buffer) |
| 253 | { |
| 254 | struct pt_regs *regs; |
| 255 | |
Al Viro | c7584fb | 2006-01-12 01:05:49 -0800 | [diff] [blame] | 256 | regs = task_pt_regs(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | buffer += sprintf(buffer, "task: %p, ksp: %p\n", |
| 258 | task, (void *)task->thread.ksp); |
| 259 | buffer += sprintf(buffer, "User PSW : %p %p\n", |
| 260 | (void *) regs->psw.mask, (void *)regs->psw.addr); |
| 261 | |
| 262 | buffer += sprintf(buffer, "User GPRS: " FOURLONG, |
| 263 | regs->gprs[0], regs->gprs[1], |
| 264 | regs->gprs[2], regs->gprs[3]); |
| 265 | buffer += sprintf(buffer, " " FOURLONG, |
| 266 | regs->gprs[4], regs->gprs[5], |
| 267 | regs->gprs[6], regs->gprs[7]); |
| 268 | buffer += sprintf(buffer, " " FOURLONG, |
| 269 | regs->gprs[8], regs->gprs[9], |
| 270 | regs->gprs[10], regs->gprs[11]); |
| 271 | buffer += sprintf(buffer, " " FOURLONG, |
| 272 | regs->gprs[12], regs->gprs[13], |
| 273 | regs->gprs[14], regs->gprs[15]); |
| 274 | buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n", |
| 275 | task->thread.acrs[0], task->thread.acrs[1], |
| 276 | task->thread.acrs[2], task->thread.acrs[3]); |
| 277 | buffer += sprintf(buffer, " %08x %08x %08x %08x\n", |
| 278 | task->thread.acrs[4], task->thread.acrs[5], |
| 279 | task->thread.acrs[6], task->thread.acrs[7]); |
| 280 | buffer += sprintf(buffer, " %08x %08x %08x %08x\n", |
| 281 | task->thread.acrs[8], task->thread.acrs[9], |
| 282 | task->thread.acrs[10], task->thread.acrs[11]); |
| 283 | buffer += sprintf(buffer, " %08x %08x %08x %08x\n", |
| 284 | task->thread.acrs[12], task->thread.acrs[13], |
| 285 | task->thread.acrs[14], task->thread.acrs[15]); |
| 286 | return buffer; |
| 287 | } |
| 288 | |
| 289 | DEFINE_SPINLOCK(die_lock); |
| 290 | |
| 291 | void die(const char * str, struct pt_regs * regs, long err) |
| 292 | { |
| 293 | static int die_counter; |
| 294 | |
| 295 | debug_stop_all(); |
| 296 | console_verbose(); |
| 297 | spin_lock_irq(&die_lock); |
| 298 | bust_spinlocks(1); |
| 299 | printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); |
| 300 | show_regs(regs); |
| 301 | bust_spinlocks(0); |
| 302 | spin_unlock_irq(&die_lock); |
| 303 | if (in_interrupt()) |
| 304 | panic("Fatal exception in interrupt"); |
| 305 | if (panic_on_oops) |
| 306 | panic("Fatal exception: panic_on_oops"); |
| 307 | do_exit(SIGSEGV); |
| 308 | } |
| 309 | |
| 310 | static void inline |
| 311 | report_user_fault(long interruption_code, struct pt_regs *regs) |
| 312 | { |
| 313 | #if defined(CONFIG_SYSCTL) |
| 314 | if (!sysctl_userprocess_debug) |
| 315 | return; |
| 316 | #endif |
| 317 | #if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG) |
| 318 | printk("User process fault: interruption code 0x%lX\n", |
| 319 | interruption_code); |
| 320 | show_regs(regs); |
| 321 | #endif |
| 322 | } |
| 323 | |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 324 | static void __kprobes inline do_trap(long interruption_code, int signr, |
| 325 | char *str, struct pt_regs *regs, |
| 326 | siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | /* |
| 329 | * We got all needed information from the lowcore and can |
| 330 | * now safely switch on interrupts. |
| 331 | */ |
| 332 | if (regs->psw.mask & PSW_MASK_PSTATE) |
| 333 | local_irq_enable(); |
| 334 | |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 335 | if (notify_die(DIE_TRAP, str, regs, interruption_code, |
| 336 | interruption_code, signr) == NOTIFY_STOP) |
| 337 | return; |
| 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | if (regs->psw.mask & PSW_MASK_PSTATE) { |
| 340 | struct task_struct *tsk = current; |
| 341 | |
| 342 | tsk->thread.trap_no = interruption_code & 0xffff; |
| 343 | force_sig_info(signr, info, tsk); |
| 344 | report_user_fault(interruption_code, regs); |
| 345 | } else { |
| 346 | const struct exception_table_entry *fixup; |
| 347 | fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); |
| 348 | if (fixup) |
| 349 | regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE; |
| 350 | else |
| 351 | die(str, regs, interruption_code); |
| 352 | } |
| 353 | } |
| 354 | |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 355 | static inline void __user *get_check_address(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | { |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 357 | return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 360 | void __kprobes do_single_step(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
Michael Grundy | 4ba069b | 2006-09-20 15:58:39 +0200 | [diff] [blame] | 362 | if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, |
| 363 | SIGTRAP) == NOTIFY_STOP){ |
| 364 | return; |
| 365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | if ((current->ptrace & PT_PTRACED) != 0) |
| 367 | force_sig(SIGTRAP, current); |
| 368 | } |
| 369 | |
| 370 | asmlinkage void |
| 371 | default_trap_handler(struct pt_regs * regs, long interruption_code) |
| 372 | { |
| 373 | if (regs->psw.mask & PSW_MASK_PSTATE) { |
| 374 | local_irq_enable(); |
| 375 | do_exit(SIGSEGV); |
| 376 | report_user_fault(interruption_code, regs); |
| 377 | } else |
| 378 | die("Unknown program exception", regs, interruption_code); |
| 379 | } |
| 380 | |
| 381 | #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ |
| 382 | asmlinkage void name(struct pt_regs * regs, long interruption_code) \ |
| 383 | { \ |
| 384 | siginfo_t info; \ |
| 385 | info.si_signo = signr; \ |
| 386 | info.si_errno = 0; \ |
| 387 | info.si_code = sicode; \ |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 388 | info.si_addr = siaddr; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | do_trap(interruption_code, signr, str, regs, &info); \ |
| 390 | } |
| 391 | |
| 392 | DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception, |
| 393 | ILL_ILLADR, get_check_address(regs)) |
| 394 | DO_ERROR_INFO(SIGILL, "execute exception", execute_exception, |
| 395 | ILL_ILLOPN, get_check_address(regs)) |
| 396 | DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception, |
| 397 | FPE_INTDIV, get_check_address(regs)) |
| 398 | DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception, |
| 399 | FPE_INTOVF, get_check_address(regs)) |
| 400 | DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception, |
| 401 | FPE_FLTOVF, get_check_address(regs)) |
| 402 | DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception, |
| 403 | FPE_FLTUND, get_check_address(regs)) |
| 404 | DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception, |
| 405 | FPE_FLTRES, get_check_address(regs)) |
| 406 | DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception, |
| 407 | FPE_FLTDIV, get_check_address(regs)) |
| 408 | DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception, |
| 409 | FPE_FLTINV, get_check_address(regs)) |
| 410 | DO_ERROR_INFO(SIGILL, "operand exception", operand_exception, |
| 411 | ILL_ILLOPN, get_check_address(regs)) |
| 412 | DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op, |
| 413 | ILL_PRVOPC, get_check_address(regs)) |
| 414 | DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception, |
| 415 | ILL_ILLOPN, get_check_address(regs)) |
| 416 | DO_ERROR_INFO(SIGILL, "translation exception", translation_exception, |
| 417 | ILL_ILLOPN, get_check_address(regs)) |
| 418 | |
| 419 | static inline void |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 420 | do_fp_trap(struct pt_regs *regs, void __user *location, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | int fpc, long interruption_code) |
| 422 | { |
| 423 | siginfo_t si; |
| 424 | |
| 425 | si.si_signo = SIGFPE; |
| 426 | si.si_errno = 0; |
| 427 | si.si_addr = location; |
| 428 | si.si_code = 0; |
| 429 | /* FPC[2] is Data Exception Code */ |
| 430 | if ((fpc & 0x00000300) == 0) { |
| 431 | /* bits 6 and 7 of DXC are 0 iff IEEE exception */ |
| 432 | if (fpc & 0x8000) /* invalid fp operation */ |
| 433 | si.si_code = FPE_FLTINV; |
| 434 | else if (fpc & 0x4000) /* div by 0 */ |
| 435 | si.si_code = FPE_FLTDIV; |
| 436 | else if (fpc & 0x2000) /* overflow */ |
| 437 | si.si_code = FPE_FLTOVF; |
| 438 | else if (fpc & 0x1000) /* underflow */ |
| 439 | si.si_code = FPE_FLTUND; |
| 440 | else if (fpc & 0x0800) /* inexact */ |
| 441 | si.si_code = FPE_FLTRES; |
| 442 | } |
| 443 | current->thread.ieee_instruction_pointer = (addr_t) location; |
| 444 | do_trap(interruption_code, SIGFPE, |
| 445 | "floating point exception", regs, &si); |
| 446 | } |
| 447 | |
| 448 | asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code) |
| 449 | { |
| 450 | siginfo_t info; |
| 451 | __u8 opcode[6]; |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 452 | __u16 __user *location; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | int signal = 0; |
| 454 | |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 455 | location = get_check_address(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
| 457 | /* |
| 458 | * We got all needed information from the lowcore and can |
| 459 | * now safely switch on interrupts. |
| 460 | */ |
| 461 | if (regs->psw.mask & PSW_MASK_PSTATE) |
| 462 | local_irq_enable(); |
| 463 | |
| 464 | if (regs->psw.mask & PSW_MASK_PSTATE) { |
| 465 | get_user(*((__u16 *) opcode), (__u16 __user *) location); |
| 466 | if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { |
| 467 | if (current->ptrace & PT_PTRACED) |
| 468 | force_sig(SIGTRAP, current); |
| 469 | else |
| 470 | signal = SIGILL; |
| 471 | #ifdef CONFIG_MATHEMU |
| 472 | } else if (opcode[0] == 0xb3) { |
| 473 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 474 | signal = math_emu_b3(opcode, regs); |
| 475 | } else if (opcode[0] == 0xed) { |
| 476 | get_user(*((__u32 *) (opcode+2)), |
| 477 | (__u32 *)(location+1)); |
| 478 | signal = math_emu_ed(opcode, regs); |
| 479 | } else if (*((__u16 *) opcode) == 0xb299) { |
| 480 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 481 | signal = math_emu_srnm(opcode, regs); |
| 482 | } else if (*((__u16 *) opcode) == 0xb29c) { |
| 483 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 484 | signal = math_emu_stfpc(opcode, regs); |
| 485 | } else if (*((__u16 *) opcode) == 0xb29d) { |
| 486 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 487 | signal = math_emu_lfpc(opcode, regs); |
| 488 | #endif |
| 489 | } else |
| 490 | signal = SIGILL; |
| 491 | } else |
| 492 | signal = SIGILL; |
| 493 | |
| 494 | #ifdef CONFIG_MATHEMU |
| 495 | if (signal == SIGFPE) |
| 496 | do_fp_trap(regs, location, |
| 497 | current->thread.fp_regs.fpc, interruption_code); |
| 498 | else if (signal == SIGSEGV) { |
| 499 | info.si_signo = signal; |
| 500 | info.si_errno = 0; |
| 501 | info.si_code = SEGV_MAPERR; |
| 502 | info.si_addr = (void *) location; |
| 503 | do_trap(interruption_code, signal, |
| 504 | "user address fault", regs, &info); |
| 505 | } else |
| 506 | #endif |
| 507 | if (signal) { |
| 508 | info.si_signo = signal; |
| 509 | info.si_errno = 0; |
| 510 | info.si_code = ILL_ILLOPC; |
Al Viro | 793af24 | 2006-02-01 06:55:59 -0500 | [diff] [blame] | 511 | info.si_addr = (void __user *) location; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | do_trap(interruption_code, signal, |
| 513 | "illegal operation", regs, &info); |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | |
| 518 | #ifdef CONFIG_MATHEMU |
| 519 | asmlinkage void |
| 520 | specification_exception(struct pt_regs * regs, long interruption_code) |
| 521 | { |
| 522 | __u8 opcode[6]; |
| 523 | __u16 *location = NULL; |
| 524 | int signal = 0; |
| 525 | |
| 526 | location = (__u16 *) get_check_address(regs); |
| 527 | |
| 528 | /* |
| 529 | * We got all needed information from the lowcore and can |
| 530 | * now safely switch on interrupts. |
| 531 | */ |
| 532 | if (regs->psw.mask & PSW_MASK_PSTATE) |
| 533 | local_irq_enable(); |
| 534 | |
| 535 | if (regs->psw.mask & PSW_MASK_PSTATE) { |
| 536 | get_user(*((__u16 *) opcode), location); |
| 537 | switch (opcode[0]) { |
| 538 | case 0x28: /* LDR Rx,Ry */ |
| 539 | signal = math_emu_ldr(opcode); |
| 540 | break; |
| 541 | case 0x38: /* LER Rx,Ry */ |
| 542 | signal = math_emu_ler(opcode); |
| 543 | break; |
| 544 | case 0x60: /* STD R,D(X,B) */ |
| 545 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 546 | signal = math_emu_std(opcode, regs); |
| 547 | break; |
| 548 | case 0x68: /* LD R,D(X,B) */ |
| 549 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 550 | signal = math_emu_ld(opcode, regs); |
| 551 | break; |
| 552 | case 0x70: /* STE R,D(X,B) */ |
| 553 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 554 | signal = math_emu_ste(opcode, regs); |
| 555 | break; |
| 556 | case 0x78: /* LE R,D(X,B) */ |
| 557 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 558 | signal = math_emu_le(opcode, regs); |
| 559 | break; |
| 560 | default: |
| 561 | signal = SIGILL; |
| 562 | break; |
| 563 | } |
| 564 | } else |
| 565 | signal = SIGILL; |
| 566 | |
| 567 | if (signal == SIGFPE) |
| 568 | do_fp_trap(regs, location, |
| 569 | current->thread.fp_regs.fpc, interruption_code); |
| 570 | else if (signal) { |
| 571 | siginfo_t info; |
| 572 | info.si_signo = signal; |
| 573 | info.si_errno = 0; |
| 574 | info.si_code = ILL_ILLOPN; |
| 575 | info.si_addr = location; |
| 576 | do_trap(interruption_code, signal, |
| 577 | "specification exception", regs, &info); |
| 578 | } |
| 579 | } |
| 580 | #else |
| 581 | DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, |
| 582 | ILL_ILLOPN, get_check_address(regs)); |
| 583 | #endif |
| 584 | |
| 585 | asmlinkage void data_exception(struct pt_regs * regs, long interruption_code) |
| 586 | { |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 587 | __u16 __user *location; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | int signal = 0; |
| 589 | |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 590 | location = get_check_address(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
| 592 | /* |
| 593 | * We got all needed information from the lowcore and can |
| 594 | * now safely switch on interrupts. |
| 595 | */ |
| 596 | if (regs->psw.mask & PSW_MASK_PSTATE) |
| 597 | local_irq_enable(); |
| 598 | |
| 599 | if (MACHINE_HAS_IEEE) |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame^] | 600 | asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
| 602 | #ifdef CONFIG_MATHEMU |
| 603 | else if (regs->psw.mask & PSW_MASK_PSTATE) { |
| 604 | __u8 opcode[6]; |
| 605 | get_user(*((__u16 *) opcode), location); |
| 606 | switch (opcode[0]) { |
| 607 | case 0x28: /* LDR Rx,Ry */ |
| 608 | signal = math_emu_ldr(opcode); |
| 609 | break; |
| 610 | case 0x38: /* LER Rx,Ry */ |
| 611 | signal = math_emu_ler(opcode); |
| 612 | break; |
| 613 | case 0x60: /* STD R,D(X,B) */ |
| 614 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 615 | signal = math_emu_std(opcode, regs); |
| 616 | break; |
| 617 | case 0x68: /* LD R,D(X,B) */ |
| 618 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 619 | signal = math_emu_ld(opcode, regs); |
| 620 | break; |
| 621 | case 0x70: /* STE R,D(X,B) */ |
| 622 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 623 | signal = math_emu_ste(opcode, regs); |
| 624 | break; |
| 625 | case 0x78: /* LE R,D(X,B) */ |
| 626 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 627 | signal = math_emu_le(opcode, regs); |
| 628 | break; |
| 629 | case 0xb3: |
| 630 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 631 | signal = math_emu_b3(opcode, regs); |
| 632 | break; |
| 633 | case 0xed: |
| 634 | get_user(*((__u32 *) (opcode+2)), |
| 635 | (__u32 *)(location+1)); |
| 636 | signal = math_emu_ed(opcode, regs); |
| 637 | break; |
| 638 | case 0xb2: |
| 639 | if (opcode[1] == 0x99) { |
| 640 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 641 | signal = math_emu_srnm(opcode, regs); |
| 642 | } else if (opcode[1] == 0x9c) { |
| 643 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 644 | signal = math_emu_stfpc(opcode, regs); |
| 645 | } else if (opcode[1] == 0x9d) { |
| 646 | get_user(*((__u16 *) (opcode+2)), location+1); |
| 647 | signal = math_emu_lfpc(opcode, regs); |
| 648 | } else |
| 649 | signal = SIGILL; |
| 650 | break; |
| 651 | default: |
| 652 | signal = SIGILL; |
| 653 | break; |
| 654 | } |
| 655 | } |
| 656 | #endif |
| 657 | if (current->thread.fp_regs.fpc & FPC_DXC_MASK) |
| 658 | signal = SIGFPE; |
| 659 | else |
| 660 | signal = SIGILL; |
| 661 | if (signal == SIGFPE) |
| 662 | do_fp_trap(regs, location, |
| 663 | current->thread.fp_regs.fpc, interruption_code); |
| 664 | else if (signal) { |
| 665 | siginfo_t info; |
| 666 | info.si_signo = signal; |
| 667 | info.si_errno = 0; |
| 668 | info.si_code = ILL_ILLOPN; |
| 669 | info.si_addr = location; |
| 670 | do_trap(interruption_code, signal, |
| 671 | "data exception", regs, &info); |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code) |
| 676 | { |
| 677 | siginfo_t info; |
| 678 | |
| 679 | /* Set user psw back to home space mode. */ |
| 680 | if (regs->psw.mask & PSW_MASK_PSTATE) |
| 681 | regs->psw.mask |= PSW_ASC_HOME; |
| 682 | /* Send SIGILL. */ |
| 683 | info.si_signo = SIGILL; |
| 684 | info.si_errno = 0; |
| 685 | info.si_code = ILL_PRVOPC; |
| 686 | info.si_addr = get_check_address(regs); |
| 687 | do_trap(int_code, SIGILL, "space switch event", regs, &info); |
| 688 | } |
| 689 | |
| 690 | asmlinkage void kernel_stack_overflow(struct pt_regs * regs) |
| 691 | { |
Heiko Carstens | 77eb65c | 2005-06-21 17:16:28 -0700 | [diff] [blame] | 692 | bust_spinlocks(1); |
| 693 | printk("Kernel stack overflow.\n"); |
| 694 | show_regs(regs); |
| 695 | bust_spinlocks(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | panic("Corrupt kernel stack, can't continue."); |
| 697 | } |
| 698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | /* init is done in lowcore.S and head.S */ |
| 700 | |
| 701 | void __init trap_init(void) |
| 702 | { |
| 703 | int i; |
| 704 | |
| 705 | for (i = 0; i < 128; i++) |
| 706 | pgm_check_table[i] = &default_trap_handler; |
| 707 | pgm_check_table[1] = &illegal_op; |
| 708 | pgm_check_table[2] = &privileged_op; |
| 709 | pgm_check_table[3] = &execute_exception; |
| 710 | pgm_check_table[4] = &do_protection_exception; |
| 711 | pgm_check_table[5] = &addressing_exception; |
| 712 | pgm_check_table[6] = &specification_exception; |
| 713 | pgm_check_table[7] = &data_exception; |
| 714 | pgm_check_table[8] = &overflow_exception; |
| 715 | pgm_check_table[9] = ÷_exception; |
| 716 | pgm_check_table[0x0A] = &overflow_exception; |
| 717 | pgm_check_table[0x0B] = ÷_exception; |
| 718 | pgm_check_table[0x0C] = &hfp_overflow_exception; |
| 719 | pgm_check_table[0x0D] = &hfp_underflow_exception; |
| 720 | pgm_check_table[0x0E] = &hfp_significance_exception; |
| 721 | pgm_check_table[0x0F] = &hfp_divide_exception; |
| 722 | pgm_check_table[0x10] = &do_dat_exception; |
| 723 | pgm_check_table[0x11] = &do_dat_exception; |
| 724 | pgm_check_table[0x12] = &translation_exception; |
| 725 | pgm_check_table[0x13] = &special_op_exception; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 726 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | pgm_check_table[0x38] = &do_dat_exception; |
| 728 | pgm_check_table[0x39] = &do_dat_exception; |
| 729 | pgm_check_table[0x3A] = &do_dat_exception; |
| 730 | pgm_check_table[0x3B] = &do_dat_exception; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 731 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | pgm_check_table[0x15] = &operand_exception; |
| 733 | pgm_check_table[0x1C] = &space_switch_exception; |
| 734 | pgm_check_table[0x1D] = &hfp_sqrt_exception; |
| 735 | pgm_check_table[0x40] = &do_monitor_call; |
| 736 | |
| 737 | if (MACHINE_IS_VM) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | #ifdef CONFIG_PFAULT |
Martin Schwidefsky | d4b6899 | 2005-11-07 00:59:06 -0800 | [diff] [blame] | 739 | /* |
| 740 | * Try to get pfault pseudo page faults going. |
| 741 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | if (register_early_external_interrupt(0x2603, pfault_interrupt, |
| 743 | &ext_int_pfault) != 0) |
| 744 | panic("Couldn't request external interrupt 0x2603"); |
| 745 | |
| 746 | if (pfault_init() == 0) |
| 747 | return; |
| 748 | |
| 749 | /* Tough luck, no pfault. */ |
| 750 | unregister_early_external_interrupt(0x2603, pfault_interrupt, |
| 751 | &ext_int_pfault); |
| 752 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | } |