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 void show_registers(struct pt_regs *regs) 109 { 110 int i; 111 int in_kernel = 1; 112 unsigned long esp; 113 114 esp = (unsigned long)(®s->sp); 115 if (user_mode(regs)) 116 in_kernel = 0; 117 118 printk("CPU #: %d\n" 119 " PC: %08lx SR: %08lx SP: %08lx\n", 120 smp_processor_id(), regs->pc, regs->sr, regs->sp); 121 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 122 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); 123 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", 124 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); 125 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", 126 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); 127 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", 128 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); 129 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", 130 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); 131 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", 132 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); 133 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", 134 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); 135 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", 136 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); 137 printk(" RES: %08lx oGPR11: %08lx\n", 138 regs->gpr[11], regs->orig_gpr11); 139 140 printk("Process %s (pid: %d, stackpage=%08lx)\n", 141 current->comm, current->pid, (unsigned long)current); 142 /* 143 * When in-kernel, we also print out the stack and code at the 144 * time of the fault.. 145 */ 146 if (in_kernel) { 147 148 printk("\nStack: "); 149 show_stack(NULL, (unsigned long *)esp); 150 151 printk("\nCode: "); 152 if (regs->pc < PAGE_OFFSET) 153 goto bad; 154 155 for (i = -24; i < 24; i++) { 156 unsigned char c; 157 if (__get_user(c, &((unsigned char *)regs->pc)[i])) { 158 bad: 159 printk(" Bad PC value."); 160 break; 161 } 162 163 if (i == 0) 164 printk("(%02x) ", c); 165 else 166 printk("%02x ", c); 167 } 168 } 169 printk("\n"); 170 } 171 172 void nommu_dump_state(struct pt_regs *regs, 173 unsigned long ea, unsigned long vector) 174 { 175 int i; 176 unsigned long addr, stack = regs->sp; 177 178 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector); 179 180 printk("CPU #: %d\n" 181 " PC: %08lx SR: %08lx SP: %08lx\n", 182 0, regs->pc, regs->sr, regs->sp); 183 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 184 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); 185 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", 186 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); 187 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", 188 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); 189 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", 190 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); 191 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", 192 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); 193 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", 194 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); 195 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", 196 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); 197 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", 198 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); 199 printk(" RES: %08lx oGPR11: %08lx\n", 200 regs->gpr[11], regs->orig_gpr11); 201 202 printk("Process %s (pid: %d, stackpage=%08lx)\n", 203 ((struct task_struct *)(__pa(current)))->comm, 204 ((struct task_struct *)(__pa(current)))->pid, 205 (unsigned long)current); 206 207 printk("\nStack: "); 208 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack); 209 for (i = 0; i < kstack_depth_to_print; i++) { 210 if (((long)stack & (THREAD_SIZE - 1)) == 0) 211 break; 212 stack++; 213 214 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4, 215 *((unsigned long *)(__pa(stack)))); 216 } 217 printk("\n"); 218 219 printk("Call Trace: "); 220 i = 1; 221 while (((long)stack & (THREAD_SIZE - 1)) != 0) { 222 addr = *((unsigned long *)__pa(stack)); 223 stack++; 224 225 if (kernel_text_address(addr)) { 226 if (i && ((i % 6) == 0)) 227 printk("\n "); 228 printk(" [<%08lx>]", addr); 229 i++; 230 } 231 } 232 printk("\n"); 233 234 printk("\nCode: "); 235 236 for (i = -24; i < 24; i++) { 237 unsigned char c; 238 c = ((unsigned char *)(__pa(regs->pc)))[i]; 239 240 if (i == 0) 241 printk("(%02x) ", c); 242 else 243 printk("%02x ", c); 244 } 245 printk("\n"); 246 } 247 248 /* This is normally the 'Oops' routine */ 249 void die(const char *str, struct pt_regs *regs, long err) 250 { 251 252 console_verbose(); 253 printk("\n%s#: %04lx\n", str, err & 0xffff); 254 show_registers(regs); 255 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION 256 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n"); 257 258 /* shut down interrupts */ 259 local_irq_disable(); 260 261 __asm__ __volatile__("l.nop 1"); 262 do {} while (1); 263 #endif 264 do_exit(SIGSEGV); 265 } 266 267 /* This is normally the 'Oops' routine */ 268 void die_if_kernel(const char *str, struct pt_regs *regs, long err) 269 { 270 if (user_mode(regs)) 271 return; 272 273 die(str, regs, err); 274 } 275 276 void unhandled_exception(struct pt_regs *regs, int ea, int vector) 277 { 278 printk("Unable to handle exception at EA =0x%x, vector 0x%x", 279 ea, vector); 280 die("Oops", regs, 9); 281 } 282 283 void __init trap_init(void) 284 { 285 /* Nothing needs to be done */ 286 } 287 288 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) 289 { 290 siginfo_t info; 291 memset(&info, 0, sizeof(info)); 292 info.si_signo = SIGTRAP; 293 info.si_code = TRAP_TRACE; 294 info.si_addr = (void *)address; 295 force_sig_info(SIGTRAP, &info, current); 296 297 regs->pc += 4; 298 } 299 300 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) 301 { 302 siginfo_t info; 303 304 if (user_mode(regs)) { 305 /* Send a SIGSEGV */ 306 info.si_signo = SIGSEGV; 307 info.si_errno = 0; 308 /* info.si_code has been set above */ 309 info.si_addr = (void *)address; 310 force_sig_info(SIGSEGV, &info, current); 311 } else { 312 printk("KERNEL: Unaligned Access 0x%.8lx\n", address); 313 show_registers(regs); 314 die("Die:", regs, address); 315 } 316 317 } 318 319 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address) 320 { 321 siginfo_t info; 322 323 if (user_mode(regs)) { 324 /* Send a SIGBUS */ 325 info.si_signo = SIGBUS; 326 info.si_errno = 0; 327 info.si_code = BUS_ADRERR; 328 info.si_addr = (void *)address; 329 force_sig_info(SIGBUS, &info, current); 330 } else { /* Kernel mode */ 331 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address); 332 show_registers(regs); 333 die("Die:", regs, address); 334 } 335 } 336 337 asmlinkage void do_illegal_instruction(struct pt_regs *regs, 338 unsigned long address) 339 { 340 siginfo_t info; 341 342 if (user_mode(regs)) { 343 /* Send a SIGILL */ 344 info.si_signo = SIGILL; 345 info.si_errno = 0; 346 info.si_code = ILL_ILLOPC; 347 info.si_addr = (void *)address; 348 force_sig_info(SIGBUS, &info, current); 349 } else { /* Kernel mode */ 350 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n", 351 address); 352 show_registers(regs); 353 die("Die:", regs, address); 354 } 355 } 356