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/sched/debug.h>
26 #include <linux/sched/task_stack.h>
27 #include <linux/kernel.h>
28 #include <linux/extable.h>
29 #include <linux/kmod.h>
30 #include <linux/string.h>
31 #include <linux/errno.h>
32 #include <linux/ptrace.h>
33 #include <linux/timer.h>
35 #include <linux/kallsyms.h>
36 #include <linux/uaccess.h>
38 #include <asm/segment.h>
40 #include <asm/pgtable.h>
41 #include <asm/unwinder.h>
42 #include <asm/sections.h>
44 int kstack_depth_to_print = 0x180;
46 unsigned long __user *lwa_addr;
48 void print_trace(void *data, unsigned long addr, int reliable)
50 pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
54 /* displays a short stack trace */
55 void show_stack(struct task_struct *task, unsigned long *esp)
58 esp = (unsigned long *)&esp;
60 pr_emerg("Call trace:\n");
61 unwind_stack(NULL, esp, print_trace);
64 void show_trace_task(struct task_struct *tsk)
67 * TODO: SysRq-T trace dump...
71 void show_registers(struct pt_regs *regs)
77 esp = (unsigned long)(regs->sp);
82 " PC: %08lx SR: %08lx SP: %08lx\n",
83 smp_processor_id(), regs->pc, regs->sr, regs->sp);
84 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
85 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
86 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
87 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
88 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
89 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
90 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
91 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
92 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
93 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
94 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
95 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
96 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
97 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
98 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
99 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
100 printk(" RES: %08lx oGPR11: %08lx\n",
101 regs->gpr[11], regs->orig_gpr11);
103 printk("Process %s (pid: %d, stackpage=%08lx)\n",
104 current->comm, current->pid, (unsigned long)current);
106 * When in-kernel, we also print out the stack and code at the
107 * time of the fault..
112 show_stack(NULL, (unsigned long *)esp);
115 if (regs->pc < PAGE_OFFSET)
118 for (i = -24; i < 24; i++) {
120 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
122 printk(" Bad PC value.");
127 printk("(%02x) ", c);
135 void nommu_dump_state(struct pt_regs *regs,
136 unsigned long ea, unsigned long vector)
139 unsigned long addr, stack = regs->sp;
141 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
144 " PC: %08lx SR: %08lx SP: %08lx\n",
145 0, regs->pc, regs->sr, regs->sp);
146 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
147 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
148 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
149 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
150 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
151 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
152 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
153 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
154 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
155 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
156 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
157 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
158 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
159 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
160 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
161 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
162 printk(" RES: %08lx oGPR11: %08lx\n",
163 regs->gpr[11], regs->orig_gpr11);
165 printk("Process %s (pid: %d, stackpage=%08lx)\n",
166 ((struct task_struct *)(__pa(current)))->comm,
167 ((struct task_struct *)(__pa(current)))->pid,
168 (unsigned long)current);
171 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
172 for (i = 0; i < kstack_depth_to_print; i++) {
173 if (((long)stack & (THREAD_SIZE - 1)) == 0)
177 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
178 *((unsigned long *)(__pa(stack))));
182 printk("Call Trace: ");
184 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
185 addr = *((unsigned long *)__pa(stack));
188 if (kernel_text_address(addr)) {
189 if (i && ((i % 6) == 0))
191 printk(" [<%08lx>]", addr);
199 for (i = -24; i < 24; i++) {
201 c = ((unsigned char *)(__pa(regs->pc)))[i];
204 printk("(%02x) ", c);
211 /* This is normally the 'Oops' routine */
212 void die(const char *str, struct pt_regs *regs, long err)
216 printk("\n%s#: %04lx\n", str, err & 0xffff);
217 show_registers(regs);
218 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
219 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
221 /* shut down interrupts */
224 __asm__ __volatile__("l.nop 1");
230 /* This is normally the 'Oops' routine */
231 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
239 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
241 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
243 die("Oops", regs, 9);
246 void __init trap_init(void)
248 /* Nothing needs to be done */
251 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
254 memset(&info, 0, sizeof(info));
255 info.si_signo = SIGTRAP;
256 info.si_code = TRAP_TRACE;
257 info.si_addr = (void *)address;
258 force_sig_info(SIGTRAP, &info, current);
263 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
267 if (user_mode(regs)) {
269 info.si_signo = SIGBUS;
271 info.si_code = BUS_ADRALN;
272 info.si_addr = (void __user *)address;
273 force_sig_info(SIGBUS, &info, current);
275 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
276 show_registers(regs);
277 die("Die:", regs, address);
282 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
286 if (user_mode(regs)) {
288 info.si_signo = SIGBUS;
290 info.si_code = BUS_ADRERR;
291 info.si_addr = (void *)address;
292 force_sig_info(SIGBUS, &info, current);
293 } else { /* Kernel mode */
294 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
295 show_registers(regs);
296 die("Die:", regs, address);
300 static inline int in_delay_slot(struct pt_regs *regs)
302 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
303 /* No delay slot flag, do the old way */
304 unsigned int op, insn;
306 insn = *((unsigned int *)regs->pc);
310 case 0x01: /* l.jal */
311 case 0x03: /* l.bnf */
312 case 0x04: /* l.bf */
313 case 0x11: /* l.jr */
314 case 0x12: /* l.jalr */
320 return regs->sr & SPR_SR_DSX;
324 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
327 unsigned int rb, op, jmp;
329 if (unlikely(in_delay_slot(regs))) {
330 /* In delay slot, instruction at pc is a branch, simulate it */
331 jmp = *((unsigned int *)regs->pc);
333 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
334 rb = (jmp & 0x0000ffff) >> 11;
339 regs->pc += displacement;
341 case 0x01: /* l.jal */
342 regs->pc += displacement;
343 regs->gpr[9] = regs->pc + 8;
345 case 0x03: /* l.bnf */
346 if (regs->sr & SPR_SR_F)
349 regs->pc += displacement;
351 case 0x04: /* l.bf */
352 if (regs->sr & SPR_SR_F)
353 regs->pc += displacement;
357 case 0x11: /* l.jr */
358 regs->pc = regs->gpr[rb];
360 case 0x12: /* l.jalr */
361 regs->pc = regs->gpr[rb];
362 regs->gpr[9] = regs->pc + 8;
372 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
377 unsigned long orig_pc;
380 const struct exception_table_entry *entry;
383 adjust_pc(regs, address);
385 ra = (insn >> 16) & 0x1f;
386 rd = (insn >> 21) & 0x1f;
388 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
390 if ((unsigned long)lwa_addr & 0x3) {
391 do_unaligned_access(regs, address);
395 if (get_user(value, lwa_addr)) {
396 if (user_mode(regs)) {
397 force_sig(SIGSEGV, current);
401 if ((entry = search_exception_tables(orig_pc))) {
402 regs->pc = entry->fixup;
406 /* kernel access in kernel space, load it directly */
407 value = *((unsigned long *)lwa_addr);
411 regs->gpr[rd] = value;
414 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
417 unsigned long __user *vaddr;
418 unsigned long orig_pc;
422 const struct exception_table_entry *entry;
425 adjust_pc(regs, address);
427 ra = (insn >> 16) & 0x1f;
428 rb = (insn >> 11) & 0x1f;
429 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
430 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
432 if (!lwa_flag || vaddr != lwa_addr) {
433 regs->sr &= ~SPR_SR_F;
437 if ((unsigned long)vaddr & 0x3) {
438 do_unaligned_access(regs, address);
442 if (put_user(regs->gpr[rb], vaddr)) {
443 if (user_mode(regs)) {
444 force_sig(SIGSEGV, current);
448 if ((entry = search_exception_tables(orig_pc))) {
449 regs->pc = entry->fixup;
453 /* kernel access in kernel space, store it directly */
454 *((unsigned long *)vaddr) = regs->gpr[rb];
458 regs->sr |= SPR_SR_F;
461 #define INSN_LWA 0x1b
462 #define INSN_SWA 0x33
464 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
465 unsigned long address)
469 unsigned int insn = *((unsigned int *)address);
475 simulate_lwa(regs, address, insn);
479 simulate_swa(regs, address, insn);
486 if (user_mode(regs)) {
488 info.si_signo = SIGILL;
490 info.si_code = ILL_ILLOPC;
491 info.si_addr = (void *)address;
492 force_sig_info(SIGBUS, &info, current);
493 } else { /* Kernel mode */
494 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
496 show_registers(regs);
497 die("Die:", regs, address);