Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m68knommu/kernel/traps.c |
| 3 | * |
| 4 | * Copyright (C) 1993, 1994 by Hamish Macdonald |
| 5 | * |
| 6 | * 68040 fixes by Michael Rausch |
| 7 | * 68040 fixes by Martin Apel |
| 8 | * 68060 fixes by Roman Hodek |
| 9 | * 68060 fixes by Jesper Skov |
| 10 | * |
| 11 | * This file is subject to the terms and conditions of the GNU General Public |
| 12 | * License. See the file COPYING in the main directory of this archive |
| 13 | * for more details. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * Sets up all exception vectors |
| 18 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/sched.h> |
| 20 | #include <linux/signal.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/mm.h> |
Greg Ungerer | db81fb8 | 2005-09-02 10:42:52 +1000 | [diff] [blame] | 23 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/types.h> |
| 25 | #include <linux/a.out.h> |
| 26 | #include <linux/user.h> |
| 27 | #include <linux/string.h> |
| 28 | #include <linux/linkage.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/ptrace.h> |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 31 | #include <linux/kallsyms.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/setup.h> |
| 34 | #include <asm/fpu.h> |
| 35 | #include <asm/system.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | #include <asm/traps.h> |
| 38 | #include <asm/pgtable.h> |
| 39 | #include <asm/machdep.h> |
| 40 | #include <asm/siginfo.h> |
| 41 | |
Greg Ungerer | db81fb8 | 2005-09-02 10:42:52 +1000 | [diff] [blame] | 42 | static char const * const vec_names[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | "RESET SP", "RESET PC", "BUS ERROR", "ADDRESS ERROR", |
| 44 | "ILLEGAL INSTRUCTION", "ZERO DIVIDE", "CHK", "TRAPcc", |
| 45 | "PRIVILEGE VIOLATION", "TRACE", "LINE 1010", "LINE 1111", |
| 46 | "UNASSIGNED RESERVED 12", "COPROCESSOR PROTOCOL VIOLATION", |
| 47 | "FORMAT ERROR", "UNINITIALIZED INTERRUPT", |
| 48 | "UNASSIGNED RESERVED 16", "UNASSIGNED RESERVED 17", |
| 49 | "UNASSIGNED RESERVED 18", "UNASSIGNED RESERVED 19", |
| 50 | "UNASSIGNED RESERVED 20", "UNASSIGNED RESERVED 21", |
| 51 | "UNASSIGNED RESERVED 22", "UNASSIGNED RESERVED 23", |
| 52 | "SPURIOUS INTERRUPT", "LEVEL 1 INT", "LEVEL 2 INT", "LEVEL 3 INT", |
| 53 | "LEVEL 4 INT", "LEVEL 5 INT", "LEVEL 6 INT", "LEVEL 7 INT", |
| 54 | "SYSCALL", "TRAP #1", "TRAP #2", "TRAP #3", |
| 55 | "TRAP #4", "TRAP #5", "TRAP #6", "TRAP #7", |
| 56 | "TRAP #8", "TRAP #9", "TRAP #10", "TRAP #11", |
| 57 | "TRAP #12", "TRAP #13", "TRAP #14", "TRAP #15", |
| 58 | "FPCP BSUN", "FPCP INEXACT", "FPCP DIV BY 0", "FPCP UNDERFLOW", |
| 59 | "FPCP OPERAND ERROR", "FPCP OVERFLOW", "FPCP SNAN", |
| 60 | "FPCP UNSUPPORTED OPERATION", |
| 61 | "MMU CONFIGURATION ERROR" |
| 62 | }; |
| 63 | |
| 64 | void __init trap_init(void) |
| 65 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | void die_if_kernel(char *str, struct pt_regs *fp, int nr) |
| 69 | { |
| 70 | if (!(fp->sr & PS_S)) |
| 71 | return; |
| 72 | |
| 73 | console_verbose(); |
| 74 | printk(KERN_EMERG "%s: %08x\n",str,nr); |
| 75 | printk(KERN_EMERG "PC: [<%08lx>]\nSR: %04x SP: %p a2: %08lx\n", |
| 76 | fp->pc, fp->sr, fp, fp->a2); |
| 77 | printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", |
| 78 | fp->d0, fp->d1, fp->d2, fp->d3); |
| 79 | printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", |
| 80 | fp->d4, fp->d5, fp->a0, fp->a1); |
| 81 | |
| 82 | printk(KERN_EMERG "Process %s (pid: %d, stackpage=%08lx)\n", |
| 83 | current->comm, current->pid, PAGE_SIZE+(unsigned long)current); |
Greg Ungerer | a4c8b91 | 2007-07-19 01:49:14 -0700 | [diff] [blame] | 84 | show_stack(NULL, (unsigned long *)(fp + 1)); |
Pavel Emelianov | bcdcd8e | 2007-07-17 04:03:42 -0700 | [diff] [blame] | 85 | add_taint(TAINT_DIE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | do_exit(SIGSEGV); |
| 87 | } |
| 88 | |
| 89 | asmlinkage void buserr_c(struct frame *fp) |
| 90 | { |
| 91 | /* Only set esp0 if coming from user mode */ |
| 92 | if (user_mode(&fp->ptregs)) |
| 93 | current->thread.esp0 = (unsigned long) fp; |
| 94 | |
Greg Ungerer | bb28632 | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 95 | #if defined(DEBUG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | printk (KERN_DEBUG "*** Bus Error *** Format is %x\n", fp->ptregs.format); |
| 97 | #endif |
| 98 | |
| 99 | die_if_kernel("bad frame format",&fp->ptregs,0); |
Greg Ungerer | bb28632 | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 100 | #if defined(DEBUG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | printk(KERN_DEBUG "Unknown SIGSEGV - 4\n"); |
| 102 | #endif |
| 103 | force_sig(SIGSEGV, current); |
| 104 | } |
| 105 | |
Sebastian Siewior | 1fda83d | 2008-05-09 16:13:36 +0200 | [diff] [blame^] | 106 | static void print_this_address(unsigned long addr, int i) |
| 107 | { |
| 108 | #ifdef CONFIG_KALLSYMS |
| 109 | printk(KERN_EMERG " [%08lx] ", addr); |
| 110 | print_symbol(KERN_CONT "%s\n", addr); |
| 111 | #else |
| 112 | if (i % 5) |
| 113 | printk(KERN_CONT " [%08lx] ", addr); |
| 114 | else |
| 115 | printk(KERN_CONT "\n" KERN_EMERG " [%08lx] ", addr); |
| 116 | i++; |
| 117 | #endif |
| 118 | } |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | int kstack_depth_to_print = 48; |
| 121 | |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 122 | static void __show_stack(struct task_struct *task, unsigned long *stack) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Greg Ungerer | db81fb8 | 2005-09-02 10:42:52 +1000 | [diff] [blame] | 124 | unsigned long *endstack, addr; |
Sebastian Siewior | 1fda83d | 2008-05-09 16:13:36 +0200 | [diff] [blame^] | 125 | #ifdef CONFIG_FRAME_POINTER |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 126 | unsigned long *last_stack; |
Sebastian Siewior | 1fda83d | 2008-05-09 16:13:36 +0200 | [diff] [blame^] | 127 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | int i; |
| 129 | |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 130 | if (!stack) |
| 131 | stack = (unsigned long *)task->thread.ksp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Greg Ungerer | db81fb8 | 2005-09-02 10:42:52 +1000 | [diff] [blame] | 133 | addr = (unsigned long) stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | endstack = (unsigned long *) PAGE_ALIGN(addr); |
| 135 | |
| 136 | printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack); |
| 137 | for (i = 0; i < kstack_depth_to_print; i++) { |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 138 | if (stack + 1 + i > endstack) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | break; |
| 140 | if (i % 8 == 0) |
Greg Ungerer | 329237c | 2006-12-04 17:27:09 +1000 | [diff] [blame] | 141 | printk("\n" KERN_EMERG " "); |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 142 | printk(" %08lx", *(stack + i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
Greg Ungerer | 329237c | 2006-12-04 17:27:09 +1000 | [diff] [blame] | 144 | printk("\n"); |
Sebastian Siewior | 1fda83d | 2008-05-09 16:13:36 +0200 | [diff] [blame^] | 145 | i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 147 | #ifdef CONFIG_FRAME_POINTER |
| 148 | printk(KERN_EMERG "Call Trace:\n"); |
| 149 | |
| 150 | last_stack = stack - 1; |
| 151 | while (stack <= endstack && stack > last_stack) { |
| 152 | |
| 153 | addr = *(stack + 1); |
Sebastian Siewior | 1fda83d | 2008-05-09 16:13:36 +0200 | [diff] [blame^] | 154 | print_this_address(addr, i); |
| 155 | i++; |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 156 | |
| 157 | last_stack = stack; |
| 158 | stack = (unsigned long *)*stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
Greg Ungerer | 329237c | 2006-12-04 17:27:09 +1000 | [diff] [blame] | 160 | printk("\n"); |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 161 | #else |
Sebastian Siewior | 1fda83d | 2008-05-09 16:13:36 +0200 | [diff] [blame^] | 162 | printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n"); |
| 163 | while (stack <= endstack) { |
| 164 | addr = *stack++; |
| 165 | /* |
| 166 | * If the address is either in the text segment of the kernel, |
| 167 | * or in a region which is occupied by a module then it *may* |
| 168 | * be the address of a calling routine; if so, print it so that |
| 169 | * someone tracing down the cause of the crash will be able to |
| 170 | * figure out the call path that was taken. |
| 171 | */ |
| 172 | if (__kernel_text_address(addr)) { |
| 173 | print_this_address(addr, i); |
| 174 | i++; |
| 175 | } |
| 176 | } |
| 177 | printk(KERN_CONT "\n"); |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 178 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | void bad_super_trap(struct frame *fp) |
| 182 | { |
| 183 | console_verbose(); |
Ahmed S. Darwish | bf0059b | 2007-02-10 01:43:46 -0800 | [diff] [blame] | 184 | if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | printk (KERN_WARNING "*** %s *** FORMAT=%X\n", |
| 186 | vec_names[(fp->ptregs.vector) >> 2], |
| 187 | fp->ptregs.format); |
| 188 | else |
| 189 | printk (KERN_WARNING "*** Exception %d *** FORMAT=%X\n", |
| 190 | (fp->ptregs.vector) >> 2, |
| 191 | fp->ptregs.format); |
| 192 | printk (KERN_WARNING "Current process id is %d\n", current->pid); |
| 193 | die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0); |
| 194 | } |
| 195 | |
| 196 | asmlinkage void trap_c(struct frame *fp) |
| 197 | { |
| 198 | int sig; |
| 199 | siginfo_t info; |
| 200 | |
| 201 | if (fp->ptregs.sr & PS_S) { |
| 202 | if ((fp->ptregs.vector >> 2) == VEC_TRACE) { |
| 203 | /* traced a trapping instruction */ |
| 204 | current->ptrace |= PT_DTRACE; |
| 205 | } else |
| 206 | bad_super_trap(fp); |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | /* send the appropriate signal to the user program */ |
| 211 | switch ((fp->ptregs.vector) >> 2) { |
| 212 | case VEC_ADDRERR: |
| 213 | info.si_code = BUS_ADRALN; |
| 214 | sig = SIGBUS; |
| 215 | break; |
| 216 | case VEC_ILLEGAL: |
| 217 | case VEC_LINE10: |
| 218 | case VEC_LINE11: |
| 219 | info.si_code = ILL_ILLOPC; |
| 220 | sig = SIGILL; |
| 221 | break; |
| 222 | case VEC_PRIV: |
| 223 | info.si_code = ILL_PRVOPC; |
| 224 | sig = SIGILL; |
| 225 | break; |
| 226 | case VEC_COPROC: |
| 227 | info.si_code = ILL_COPROC; |
| 228 | sig = SIGILL; |
| 229 | break; |
| 230 | case VEC_TRAP1: /* gdbserver breakpoint */ |
| 231 | fp->ptregs.pc -= 2; |
| 232 | info.si_code = TRAP_TRACE; |
| 233 | sig = SIGTRAP; |
| 234 | break; |
| 235 | case VEC_TRAP2: |
| 236 | case VEC_TRAP3: |
| 237 | case VEC_TRAP4: |
| 238 | case VEC_TRAP5: |
| 239 | case VEC_TRAP6: |
| 240 | case VEC_TRAP7: |
| 241 | case VEC_TRAP8: |
| 242 | case VEC_TRAP9: |
| 243 | case VEC_TRAP10: |
| 244 | case VEC_TRAP11: |
| 245 | case VEC_TRAP12: |
| 246 | case VEC_TRAP13: |
| 247 | case VEC_TRAP14: |
| 248 | info.si_code = ILL_ILLTRP; |
| 249 | sig = SIGILL; |
| 250 | break; |
| 251 | case VEC_FPBRUC: |
| 252 | case VEC_FPOE: |
| 253 | case VEC_FPNAN: |
| 254 | info.si_code = FPE_FLTINV; |
| 255 | sig = SIGFPE; |
| 256 | break; |
| 257 | case VEC_FPIR: |
| 258 | info.si_code = FPE_FLTRES; |
| 259 | sig = SIGFPE; |
| 260 | break; |
| 261 | case VEC_FPDIVZ: |
| 262 | info.si_code = FPE_FLTDIV; |
| 263 | sig = SIGFPE; |
| 264 | break; |
| 265 | case VEC_FPUNDER: |
| 266 | info.si_code = FPE_FLTUND; |
| 267 | sig = SIGFPE; |
| 268 | break; |
| 269 | case VEC_FPOVER: |
| 270 | info.si_code = FPE_FLTOVF; |
| 271 | sig = SIGFPE; |
| 272 | break; |
| 273 | case VEC_ZERODIV: |
| 274 | info.si_code = FPE_INTDIV; |
| 275 | sig = SIGFPE; |
| 276 | break; |
| 277 | case VEC_CHK: |
| 278 | case VEC_TRAP: |
| 279 | info.si_code = FPE_INTOVF; |
| 280 | sig = SIGFPE; |
| 281 | break; |
| 282 | case VEC_TRACE: /* ptrace single step */ |
| 283 | info.si_code = TRAP_TRACE; |
| 284 | sig = SIGTRAP; |
| 285 | break; |
| 286 | case VEC_TRAP15: /* breakpoint */ |
| 287 | info.si_code = TRAP_BRKPT; |
| 288 | sig = SIGTRAP; |
| 289 | break; |
| 290 | default: |
| 291 | info.si_code = ILL_ILLOPC; |
| 292 | sig = SIGILL; |
| 293 | break; |
| 294 | } |
| 295 | info.si_signo = sig; |
| 296 | info.si_errno = 0; |
| 297 | switch (fp->ptregs.format) { |
| 298 | default: |
| 299 | info.si_addr = (void *) fp->ptregs.pc; |
| 300 | break; |
| 301 | case 2: |
| 302 | info.si_addr = (void *) fp->un.fmt2.iaddr; |
| 303 | break; |
| 304 | case 7: |
| 305 | info.si_addr = (void *) fp->un.fmt7.effaddr; |
| 306 | break; |
| 307 | case 9: |
| 308 | info.si_addr = (void *) fp->un.fmt9.iaddr; |
| 309 | break; |
| 310 | case 10: |
| 311 | info.si_addr = (void *) fp->un.fmta.daddr; |
| 312 | break; |
| 313 | case 11: |
| 314 | info.si_addr = (void *) fp->un.fmtb.daddr; |
| 315 | break; |
| 316 | } |
| 317 | force_sig_info (sig, &info, current); |
| 318 | } |
| 319 | |
| 320 | asmlinkage void set_esp0(unsigned long ssp) |
| 321 | { |
| 322 | current->thread.esp0 = ssp; |
| 323 | } |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | /* |
| 326 | * The architecture-independent backtrace generator |
| 327 | */ |
| 328 | void dump_stack(void) |
| 329 | { |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 330 | /* |
| 331 | * We need frame pointers for this little trick, which works as follows: |
| 332 | * |
| 333 | * +------------+ 0x00 |
| 334 | * | Next SP | -> 0x0c |
| 335 | * +------------+ 0x04 |
| 336 | * | Caller | |
| 337 | * +------------+ 0x08 |
| 338 | * | Local vars | -> our stack var |
| 339 | * +------------+ 0x0c |
| 340 | * | Next SP | -> 0x18, that is what we pass to show_stack() |
| 341 | * +------------+ 0x10 |
| 342 | * | Caller | |
| 343 | * +------------+ 0x14 |
| 344 | * | Local vars | |
| 345 | * +------------+ 0x18 |
| 346 | * | ... | |
| 347 | * +------------+ |
| 348 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 350 | unsigned long *stack; |
| 351 | |
| 352 | stack = (unsigned long *)&stack; |
| 353 | stack++; |
| 354 | __show_stack(current, stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
Greg Ungerer | db81fb8 | 2005-09-02 10:42:52 +1000 | [diff] [blame] | 356 | EXPORT_SYMBOL(dump_stack); |
| 357 | |
Sebastian Siewior | f6054e2 | 2008-05-01 12:16:38 +1000 | [diff] [blame] | 358 | void show_stack(struct task_struct *task, unsigned long *stack) |
| 359 | { |
| 360 | if (!stack && !task) |
| 361 | dump_stack(); |
| 362 | else |
| 363 | __show_stack(task, stack); |
| 364 | } |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | #ifdef CONFIG_M68KFPU_EMU |
| 367 | asmlinkage void fpemu_signal(int signal, int code, void *addr) |
| 368 | { |
| 369 | siginfo_t info; |
| 370 | |
| 371 | info.si_signo = signal; |
| 372 | info.si_errno = 0; |
| 373 | info.si_code = code; |
| 374 | info.si_addr = addr; |
| 375 | force_sig_info(signal, &info, current); |
| 376 | } |
| 377 | #endif |