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 } 117 118 void show_registers(struct pt_regs *regs) 119 { 120 int i; 121 int in_kernel = 1; 122 unsigned long esp; 123 124 esp = (unsigned long)(®s->sp); 125 if (user_mode(regs)) 126 in_kernel = 0; 127 128 printk("CPU #: %d\n" 129 " PC: %08lx SR: %08lx SP: %08lx\n", 130 smp_processor_id(), regs->pc, regs->sr, regs->sp); 131 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 132 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); 133 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", 134 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); 135 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", 136 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); 137 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", 138 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); 139 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", 140 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); 141 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", 142 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); 143 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", 144 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); 145 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", 146 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); 147 printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n", 148 regs->gpr[11], regs->orig_gpr11, regs->syscallno); 149 150 printk("Process %s (pid: %d, stackpage=%08lx)\n", 151 current->comm, current->pid, (unsigned long)current); 152 /* 153 * When in-kernel, we also print out the stack and code at the 154 * time of the fault.. 155 */ 156 if (in_kernel) { 157 158 printk("\nStack: "); 159 show_stack(NULL, (unsigned long *)esp); 160 161 printk("\nCode: "); 162 if (regs->pc < PAGE_OFFSET) 163 goto bad; 164 165 for (i = -24; i < 24; i++) { 166 unsigned char c; 167 if (__get_user(c, &((unsigned char *)regs->pc)[i])) { 168 bad: 169 printk(" Bad PC value."); 170 break; 171 } 172 173 if (i == 0) 174 printk("(%02x) ", c); 175 else 176 printk("%02x ", c); 177 } 178 } 179 printk("\n"); 180 } 181 182 void nommu_dump_state(struct pt_regs *regs, 183 unsigned long ea, unsigned long vector) 184 { 185 int i; 186 unsigned long addr, stack = regs->sp; 187 188 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector); 189 190 printk("CPU #: %d\n" 191 " PC: %08lx SR: %08lx SP: %08lx\n", 192 0, regs->pc, regs->sr, regs->sp); 193 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 194 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); 195 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", 196 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); 197 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", 198 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); 199 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", 200 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); 201 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", 202 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); 203 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", 204 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); 205 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", 206 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); 207 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", 208 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); 209 printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n", 210 regs->gpr[11], regs->orig_gpr11, regs->syscallno); 211 212 printk("Process %s (pid: %d, stackpage=%08lx)\n", 213 ((struct task_struct *)(__pa(current)))->comm, 214 ((struct task_struct *)(__pa(current)))->pid, 215 (unsigned long)current); 216 217 printk("\nStack: "); 218 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack); 219 for (i = 0; i < kstack_depth_to_print; i++) { 220 if (((long)stack & (THREAD_SIZE - 1)) == 0) 221 break; 222 stack++; 223 224 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4, 225 *((unsigned long *)(__pa(stack)))); 226 } 227 printk("\n"); 228 229 printk("Call Trace: "); 230 i = 1; 231 while (((long)stack & (THREAD_SIZE - 1)) != 0) { 232 addr = *((unsigned long *)__pa(stack)); 233 stack++; 234 235 if (kernel_text_address(addr)) { 236 if (i && ((i % 6) == 0)) 237 printk("\n "); 238 printk(" [<%08lx>]", addr); 239 i++; 240 } 241 } 242 printk("\n"); 243 244 printk("\nCode: "); 245 246 for (i = -24; i < 24; i++) { 247 unsigned char c; 248 c = ((unsigned char *)(__pa(regs->pc)))[i]; 249 250 if (i == 0) 251 printk("(%02x) ", c); 252 else 253 printk("%02x ", c); 254 } 255 printk("\n"); 256 } 257 258 /* This is normally the 'Oops' routine */ 259 void die(const char *str, struct pt_regs *regs, long err) 260 { 261 262 console_verbose(); 263 printk("\n%s#: %04lx\n", str, err & 0xffff); 264 show_registers(regs); 265 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION 266 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n"); 267 268 /* shut down interrupts */ 269 local_irq_disable(); 270 271 __asm__ __volatile__("l.nop 1"); 272 do {} while (1); 273 #endif 274 do_exit(SIGSEGV); 275 } 276 277 /* This is normally the 'Oops' routine */ 278 void die_if_kernel(const char *str, struct pt_regs *regs, long err) 279 { 280 if (user_mode(regs)) 281 return; 282 283 die(str, regs, err); 284 } 285 286 void unhandled_exception(struct pt_regs *regs, int ea, int vector) 287 { 288 printk("Unable to handle exception at EA =0x%x, vector 0x%x", 289 ea, vector); 290 die("Oops", regs, 9); 291 } 292 293 void __init trap_init(void) 294 { 295 /* Nothing needs to be done */ 296 } 297 298 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) 299 { 300 siginfo_t info; 301 memset(&info, 0, sizeof(info)); 302 info.si_signo = SIGTRAP; 303 info.si_code = TRAP_TRACE; 304 info.si_addr = (void *)address; 305 force_sig_info(SIGTRAP, &info, current); 306 307 regs->pc += 4; 308 } 309 310 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) 311 { 312 siginfo_t info; 313 314 if (user_mode(regs)) { 315 /* Send a SIGSEGV */ 316 info.si_signo = SIGSEGV; 317 info.si_errno = 0; 318 /* info.si_code has been set above */ 319 info.si_addr = (void *)address; 320 force_sig_info(SIGSEGV, &info, current); 321 } else { 322 printk("KERNEL: Unaligned Access 0x%.8lx\n", address); 323 show_registers(regs); 324 die("Die:", regs, address); 325 } 326 327 } 328 329 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address) 330 { 331 siginfo_t info; 332 333 if (user_mode(regs)) { 334 /* Send a SIGBUS */ 335 info.si_signo = SIGBUS; 336 info.si_errno = 0; 337 info.si_code = BUS_ADRERR; 338 info.si_addr = (void *)address; 339 force_sig_info(SIGBUS, &info, current); 340 } else { /* Kernel mode */ 341 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address); 342 show_registers(regs); 343 die("Die:", regs, address); 344 } 345 } 346 347 asmlinkage void do_illegal_instruction(struct pt_regs *regs, 348 unsigned long address) 349 { 350 siginfo_t info; 351 352 if (user_mode(regs)) { 353 /* Send a SIGILL */ 354 info.si_signo = SIGILL; 355 info.si_errno = 0; 356 info.si_code = ILL_ILLOPC; 357 info.si_addr = (void *)address; 358 force_sig_info(SIGBUS, &info, current); 359 } else { /* Kernel mode */ 360 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n", 361 address); 362 show_registers(regs); 363 die("Die:", regs, address); 364 } 365 } 366