1 /* 2 * OpenRISC traps.c 3 * 4 * Linux architectural port borrowing liberally from similar works of 5 * others. All original copyrights apply as per the original source 6 * declaration. 7 * 8 * Modifications for the OpenRISC architecture: 9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * Here we handle the break vectors not used by the system call 18 * mechanism, as well as some general stack/register dumping 19 * things. 20 * 21 */ 22 23 #include <linux/init.h> 24 #include <linux/sched.h> 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/kmod.h> 28 #include <linux/string.h> 29 #include <linux/errno.h> 30 #include <linux/ptrace.h> 31 #include <linux/timer.h> 32 #include <linux/mm.h> 33 #include <linux/kallsyms.h> 34 #include <asm/uaccess.h> 35 36 #include <asm/segment.h> 37 #include <asm/io.h> 38 #include <asm/pgtable.h> 39 40 extern char _etext, _stext; 41 42 int kstack_depth_to_print = 0x180; 43 44 static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) 45 { 46 return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3; 47 } 48 49 void show_trace(struct task_struct *task, unsigned long *stack) 50 { 51 struct thread_info *context; 52 unsigned long addr; 53 54 context = (struct thread_info *) 55 ((unsigned long)stack & (~(THREAD_SIZE - 1))); 56 57 while (valid_stack_ptr(context, stack)) { 58 addr = *stack++; 59 if (__kernel_text_address(addr)) { 60 printk(" [<%08lx>]", addr); 61 print_symbol(" %s", addr); 62 printk("\n"); 63 } 64 } 65 printk(" =======================\n"); 66 } 67 68 /* displays a short stack trace */ 69 void show_stack(struct task_struct *task, unsigned long *esp) 70 { 71 unsigned long addr, *stack; 72 int i; 73 74 if (esp == NULL) 75 esp = (unsigned long *)&esp; 76 77 stack = esp; 78 79 printk("Stack dump [0x%08lx]:\n", (unsigned long)esp); 80 for (i = 0; i < kstack_depth_to_print; i++) { 81 if (kstack_end(stack)) 82 break; 83 if (__get_user(addr, stack)) { 84 /* This message matches "failing address" marked 85 s390 in ksymoops, so lines containing it will 86 not be filtered out by ksymoops. */ 87 printk("Failing address 0x%lx\n", (unsigned long)stack); 88 break; 89 } 90 stack++; 91 92 printk("sp + %02d: 0x%08lx\n", i * 4, addr); 93 } 94 printk("\n"); 95 96 show_trace(task, esp); 97 98 return; 99 } 100 101 void show_trace_task(struct task_struct *tsk) 102 { 103 /* 104 * TODO: SysRq-T trace dump... 105 */ 106 } 107 108 /* 109 * The architecture-independent backtrace generator 110 */ 111 void dump_stack(void) 112 { 113 unsigned long stack; 114 115 show_stack(current, &stack); 116 } 117 EXPORT_SYMBOL(dump_stack); 118 119 void show_registers(struct pt_regs *regs) 120 { 121 int i; 122 int in_kernel = 1; 123 unsigned long esp; 124 125 esp = (unsigned long)(®s->sp); 126 if (user_mode(regs)) 127 in_kernel = 0; 128 129 printk("CPU #: %d\n" 130 " PC: %08lx SR: %08lx SP: %08lx\n", 131 smp_processor_id(), regs->pc, regs->sr, regs->sp); 132 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 133 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); 134 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", 135 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); 136 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", 137 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); 138 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", 139 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); 140 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", 141 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); 142 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", 143 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); 144 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", 145 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); 146 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", 147 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); 148 printk(" RES: %08lx oGPR11: %08lx\n", 149 regs->gpr[11], regs->orig_gpr11); 150 151 printk("Process %s (pid: %d, stackpage=%08lx)\n", 152 current->comm, current->pid, (unsigned long)current); 153 /* 154 * When in-kernel, we also print out the stack and code at the 155 * time of the fault.. 156 */ 157 if (in_kernel) { 158 159 printk("\nStack: "); 160 show_stack(NULL, (unsigned long *)esp); 161 162 printk("\nCode: "); 163 if (regs->pc < PAGE_OFFSET) 164 goto bad; 165 166 for (i = -24; i < 24; i++) { 167 unsigned char c; 168 if (__get_user(c, &((unsigned char *)regs->pc)[i])) { 169 bad: 170 printk(" Bad PC value."); 171 break; 172 } 173 174 if (i == 0) 175 printk("(%02x) ", c); 176 else 177 printk("%02x ", c); 178 } 179 } 180 printk("\n"); 181 } 182 183 void nommu_dump_state(struct pt_regs *regs, 184 unsigned long ea, unsigned long vector) 185 { 186 int i; 187 unsigned long addr, stack = regs->sp; 188 189 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector); 190 191 printk("CPU #: %d\n" 192 " PC: %08lx SR: %08lx SP: %08lx\n", 193 0, regs->pc, regs->sr, regs->sp); 194 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 195 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); 196 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", 197 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); 198 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", 199 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); 200 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", 201 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); 202 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", 203 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); 204 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", 205 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); 206 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", 207 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); 208 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", 209 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); 210 printk(" RES: %08lx oGPR11: %08lx\n", 211 regs->gpr[11], regs->orig_gpr11); 212 213 printk("Process %s (pid: %d, stackpage=%08lx)\n", 214 ((struct task_struct *)(__pa(current)))->comm, 215 ((struct task_struct *)(__pa(current)))->pid, 216 (unsigned long)current); 217 218 printk("\nStack: "); 219 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack); 220 for (i = 0; i < kstack_depth_to_print; i++) { 221 if (((long)stack & (THREAD_SIZE - 1)) == 0) 222 break; 223 stack++; 224 225 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4, 226 *((unsigned long *)(__pa(stack)))); 227 } 228 printk("\n"); 229 230 printk("Call Trace: "); 231 i = 1; 232 while (((long)stack & (THREAD_SIZE - 1)) != 0) { 233 addr = *((unsigned long *)__pa(stack)); 234 stack++; 235 236 if (kernel_text_address(addr)) { 237 if (i && ((i % 6) == 0)) 238 printk("\n "); 239 printk(" [<%08lx>]", addr); 240 i++; 241 } 242 } 243 printk("\n"); 244 245 printk("\nCode: "); 246 247 for (i = -24; i < 24; i++) { 248 unsigned char c; 249 c = ((unsigned char *)(__pa(regs->pc)))[i]; 250 251 if (i == 0) 252 printk("(%02x) ", c); 253 else 254 printk("%02x ", c); 255 } 256 printk("\n"); 257 } 258 259 /* This is normally the 'Oops' routine */ 260 void die(const char *str, struct pt_regs *regs, long err) 261 { 262 263 console_verbose(); 264 printk("\n%s#: %04lx\n", str, err & 0xffff); 265 show_registers(regs); 266 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION 267 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n"); 268 269 /* shut down interrupts */ 270 local_irq_disable(); 271 272 __asm__ __volatile__("l.nop 1"); 273 do {} while (1); 274 #endif 275 do_exit(SIGSEGV); 276 } 277 278 /* This is normally the 'Oops' routine */ 279 void die_if_kernel(const char *str, struct pt_regs *regs, long err) 280 { 281 if (user_mode(regs)) 282 return; 283 284 die(str, regs, err); 285 } 286 287 void unhandled_exception(struct pt_regs *regs, int ea, int vector) 288 { 289 printk("Unable to handle exception at EA =0x%x, vector 0x%x", 290 ea, vector); 291 die("Oops", regs, 9); 292 } 293 294 void __init trap_init(void) 295 { 296 /* Nothing needs to be done */ 297 } 298 299 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) 300 { 301 siginfo_t info; 302 memset(&info, 0, sizeof(info)); 303 info.si_signo = SIGTRAP; 304 info.si_code = TRAP_TRACE; 305 info.si_addr = (void *)address; 306 force_sig_info(SIGTRAP, &info, current); 307 308 regs->pc += 4; 309 } 310 311 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) 312 { 313 siginfo_t info; 314 315 if (user_mode(regs)) { 316 /* Send a SIGSEGV */ 317 info.si_signo = SIGSEGV; 318 info.si_errno = 0; 319 /* info.si_code has been set above */ 320 info.si_addr = (void *)address; 321 force_sig_info(SIGSEGV, &info, current); 322 } else { 323 printk("KERNEL: Unaligned Access 0x%.8lx\n", address); 324 show_registers(regs); 325 die("Die:", regs, address); 326 } 327 328 } 329 330 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address) 331 { 332 siginfo_t info; 333 334 if (user_mode(regs)) { 335 /* Send a SIGBUS */ 336 info.si_signo = SIGBUS; 337 info.si_errno = 0; 338 info.si_code = BUS_ADRERR; 339 info.si_addr = (void *)address; 340 force_sig_info(SIGBUS, &info, current); 341 } else { /* Kernel mode */ 342 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address); 343 show_registers(regs); 344 die("Die:", regs, address); 345 } 346 } 347 348 asmlinkage void do_illegal_instruction(struct pt_regs *regs, 349 unsigned long address) 350 { 351 siginfo_t info; 352 353 if (user_mode(regs)) { 354 /* Send a SIGILL */ 355 info.si_signo = SIGILL; 356 info.si_errno = 0; 357 info.si_code = ILL_ILLOPC; 358 info.si_addr = (void *)address; 359 force_sig_info(SIGBUS, &info, current); 360 } else { /* Kernel mode */ 361 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n", 362 address); 363 show_registers(regs); 364 die("Die:", regs, address); 365 } 366 } 367