4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
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>
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.
17 * Here we handle the break vectors not used by the system call
18 * mechanism, as well as some general stack/register dumping
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>
33 #include <linux/kallsyms.h>
34 #include <asm/uaccess.h>
36 #include <asm/system.h>
37 #include <asm/segment.h>
39 #include <asm/pgtable.h>
41 extern char _etext, _stext;
43 int kstack_depth_to_print = 0x180;
45 static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
47 return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
50 void show_trace(struct task_struct *task, unsigned long *stack)
52 struct thread_info *context;
55 context = (struct thread_info *)
56 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
58 while (valid_stack_ptr(context, stack)) {
60 if (__kernel_text_address(addr)) {
61 printk(" [<%08lx>]", addr);
62 print_symbol(" %s", addr);
66 printk(" =======================\n");
69 /* displays a short stack trace */
70 void show_stack(struct task_struct *task, unsigned long *esp)
72 unsigned long addr, *stack;
76 esp = (unsigned long *)&esp;
80 printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
81 for (i = 0; i < kstack_depth_to_print; i++) {
82 if (kstack_end(stack))
84 if (__get_user(addr, stack)) {
85 /* This message matches "failing address" marked
86 s390 in ksymoops, so lines containing it will
87 not be filtered out by ksymoops. */
88 printk("Failing address 0x%lx\n", (unsigned long)stack);
93 printk("sp + %02d: 0x%08lx\n", i * 4, addr);
97 show_trace(task, esp);
102 void show_trace_task(struct task_struct *tsk)
105 * TODO: SysRq-T trace dump...
110 * The architecture-independent backtrace generator
112 void dump_stack(void)
116 show_stack(current, &stack);
118 EXPORT_SYMBOL(dump_stack);
120 void show_registers(struct pt_regs *regs)
126 esp = (unsigned long)(®s->sp);
131 " PC: %08lx SR: %08lx SP: %08lx\n",
132 smp_processor_id(), regs->pc, regs->sr, regs->sp);
133 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
134 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
135 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
136 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
137 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
138 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
139 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
140 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
141 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
142 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
143 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
144 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
145 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
146 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
147 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
148 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
149 printk(" RES: %08lx oGPR11: %08lx\n",
150 regs->gpr[11], regs->orig_gpr11);
152 printk("Process %s (pid: %d, stackpage=%08lx)\n",
153 current->comm, current->pid, (unsigned long)current);
155 * When in-kernel, we also print out the stack and code at the
156 * time of the fault..
161 show_stack(NULL, (unsigned long *)esp);
164 if (regs->pc < PAGE_OFFSET)
167 for (i = -24; i < 24; i++) {
169 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
171 printk(" Bad PC value.");
176 printk("(%02x) ", c);
184 void nommu_dump_state(struct pt_regs *regs,
185 unsigned long ea, unsigned long vector)
188 unsigned long addr, stack = regs->sp;
190 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
193 " PC: %08lx SR: %08lx SP: %08lx\n",
194 0, regs->pc, regs->sr, regs->sp);
195 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
196 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
197 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
198 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
199 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
200 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
201 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
202 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
203 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
204 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
205 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
206 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
207 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
208 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
209 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
210 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
211 printk(" RES: %08lx oGPR11: %08lx\n",
212 regs->gpr[11], regs->orig_gpr11);
214 printk("Process %s (pid: %d, stackpage=%08lx)\n",
215 ((struct task_struct *)(__pa(current)))->comm,
216 ((struct task_struct *)(__pa(current)))->pid,
217 (unsigned long)current);
220 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
221 for (i = 0; i < kstack_depth_to_print; i++) {
222 if (((long)stack & (THREAD_SIZE - 1)) == 0)
226 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
227 *((unsigned long *)(__pa(stack))));
231 printk("Call Trace: ");
233 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
234 addr = *((unsigned long *)__pa(stack));
237 if (kernel_text_address(addr)) {
238 if (i && ((i % 6) == 0))
240 printk(" [<%08lx>]", addr);
248 for (i = -24; i < 24; i++) {
250 c = ((unsigned char *)(__pa(regs->pc)))[i];
253 printk("(%02x) ", c);
260 /* This is normally the 'Oops' routine */
261 void die(const char *str, struct pt_regs *regs, long err)
265 printk("\n%s#: %04lx\n", str, err & 0xffff);
266 show_registers(regs);
267 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
268 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
270 /* shut down interrupts */
273 __asm__ __volatile__("l.nop 1");
279 /* This is normally the 'Oops' routine */
280 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
288 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
290 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
292 die("Oops", regs, 9);
295 void __init trap_init(void)
297 /* Nothing needs to be done */
300 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
303 memset(&info, 0, sizeof(info));
304 info.si_signo = SIGTRAP;
305 info.si_code = TRAP_TRACE;
306 info.si_addr = (void *)address;
307 force_sig_info(SIGTRAP, &info, current);
312 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
316 if (user_mode(regs)) {
318 info.si_signo = SIGSEGV;
320 /* info.si_code has been set above */
321 info.si_addr = (void *)address;
322 force_sig_info(SIGSEGV, &info, current);
324 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
325 show_registers(regs);
326 die("Die:", regs, address);
331 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
335 if (user_mode(regs)) {
337 info.si_signo = SIGBUS;
339 info.si_code = BUS_ADRERR;
340 info.si_addr = (void *)address;
341 force_sig_info(SIGBUS, &info, current);
342 } else { /* Kernel mode */
343 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
344 show_registers(regs);
345 die("Die:", regs, address);
349 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
350 unsigned long address)
354 if (user_mode(regs)) {
356 info.si_signo = SIGILL;
358 info.si_code = ILL_ILLOPC;
359 info.si_addr = (void *)address;
360 force_sig_info(SIGBUS, &info, current);
361 } else { /* Kernel mode */
362 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
364 show_registers(regs);
365 die("Die:", regs, address);