1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
13 * Here we handle the break vectors not used by the system call
14 * mechanism, as well as some general stack/register dumping
18 #include <linux/init.h>
19 #include <linux/sched.h>
20 #include <linux/sched/debug.h>
21 #include <linux/sched/task_stack.h>
22 #include <linux/kernel.h>
23 #include <linux/extable.h>
24 #include <linux/kmod.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
27 #include <linux/ptrace.h>
28 #include <linux/timer.h>
30 #include <linux/kallsyms.h>
31 #include <linux/uaccess.h>
34 #include <asm/unwinder.h>
35 #include <asm/sections.h>
37 static int kstack_depth_to_print = 0x180;
39 static unsigned long __user *lwa_addr;
41 static void print_trace(void *data, unsigned long addr, int reliable)
43 const char *loglvl = data;
45 printk("%s[<%p>] %s%pS\n", loglvl, (void *) addr, reliable ? "" : "? ",
49 static void print_data(unsigned long base_addr, unsigned long word, int i)
52 printk("(%08lx:)\t%08lx", base_addr + (i * 4), word);
54 printk(" %08lx:\t%08lx", base_addr + (i * 4), word);
57 /* displays a short stack trace */
58 void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
61 esp = (unsigned long *)&esp;
63 printk("%sCall trace:\n", loglvl);
64 unwind_stack((void *)loglvl, esp, print_trace);
67 void show_registers(struct pt_regs *regs)
73 esp = (unsigned long)(regs->sp);
78 " PC: %08lx SR: %08lx SP: %08lx\n",
79 smp_processor_id(), regs->pc, regs->sr, regs->sp);
80 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
81 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
82 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
83 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
84 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
85 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
86 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
87 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
88 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
89 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
90 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
91 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
92 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
93 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
94 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
95 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
96 printk(" RES: %08lx oGPR11: %08lx\n",
97 regs->gpr[11], regs->orig_gpr11);
99 printk("Process %s (pid: %d, stackpage=%08lx)\n",
100 current->comm, current->pid, (unsigned long)current);
102 * When in-kernel, we also print out the stack and code at the
103 * time of the fault..
108 show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
110 if (esp < PAGE_OFFSET)
114 for (i = -8; i < 24; i += 1) {
117 if (__get_user(word, &((unsigned long *)esp)[i])) {
119 printk(" Bad Stack value.");
123 print_data(esp, word, i);
127 if (regs->pc < PAGE_OFFSET)
130 for (i = -6; i < 6; i += 1) {
133 if (__get_user(word, &((unsigned long *)regs->pc)[i])) {
135 printk(" Bad PC value.");
139 print_data(regs->pc, word, i);
145 void nommu_dump_state(struct pt_regs *regs,
146 unsigned long ea, unsigned long vector)
149 unsigned long addr, stack = regs->sp;
151 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
154 " PC: %08lx SR: %08lx SP: %08lx\n",
155 0, regs->pc, regs->sr, regs->sp);
156 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
157 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
158 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
159 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
160 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
161 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
162 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
163 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
164 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
165 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
166 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
167 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
168 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
169 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
170 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
171 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
172 printk(" RES: %08lx oGPR11: %08lx\n",
173 regs->gpr[11], regs->orig_gpr11);
175 printk("Process %s (pid: %d, stackpage=%08lx)\n",
176 ((struct task_struct *)(__pa(current)))->comm,
177 ((struct task_struct *)(__pa(current)))->pid,
178 (unsigned long)current);
181 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
182 for (i = 0; i < kstack_depth_to_print; i++) {
183 if (((long)stack & (THREAD_SIZE - 1)) == 0)
187 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
188 *((unsigned long *)(__pa(stack))));
192 printk("Call Trace: ");
194 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
195 addr = *((unsigned long *)__pa(stack));
198 if (kernel_text_address(addr)) {
199 if (i && ((i % 6) == 0))
201 printk(" [<%08lx>]", addr);
209 for (i = -24; i < 24; i++) {
212 word = ((unsigned long *)(__pa(regs->pc)))[i];
214 print_data(regs->pc, word, i);
219 /* This is normally the 'Oops' routine */
220 void __noreturn die(const char *str, struct pt_regs *regs, long err)
224 printk("\n%s#: %04lx\n", str, err & 0xffff);
225 show_registers(regs);
226 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
227 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
229 /* shut down interrupts */
232 __asm__ __volatile__("l.nop 1");
235 make_task_dead(SIGSEGV);
238 asmlinkage void unhandled_exception(struct pt_regs *regs, int ea, int vector)
240 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
242 die("Oops", regs, 9);
245 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
247 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
250 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
252 if (user_mode(regs)) {
254 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
256 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
257 show_registers(regs);
258 die("Die:", regs, address);
263 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
265 if (user_mode(regs)) {
267 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
268 } else { /* Kernel mode */
269 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
270 show_registers(regs);
271 die("Die:", regs, address);
275 static inline int in_delay_slot(struct pt_regs *regs)
277 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
278 /* No delay slot flag, do the old way */
279 unsigned int op, insn;
281 insn = *((unsigned int *)regs->pc);
285 case 0x01: /* l.jal */
286 case 0x03: /* l.bnf */
287 case 0x04: /* l.bf */
288 case 0x11: /* l.jr */
289 case 0x12: /* l.jalr */
295 return mfspr(SPR_SR) & SPR_SR_DSX;
299 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
302 unsigned int rb, op, jmp;
304 if (unlikely(in_delay_slot(regs))) {
305 /* In delay slot, instruction at pc is a branch, simulate it */
306 jmp = *((unsigned int *)regs->pc);
308 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
309 rb = (jmp & 0x0000ffff) >> 11;
314 regs->pc += displacement;
316 case 0x01: /* l.jal */
317 regs->pc += displacement;
318 regs->gpr[9] = regs->pc + 8;
320 case 0x03: /* l.bnf */
321 if (regs->sr & SPR_SR_F)
324 regs->pc += displacement;
326 case 0x04: /* l.bf */
327 if (regs->sr & SPR_SR_F)
328 regs->pc += displacement;
332 case 0x11: /* l.jr */
333 regs->pc = regs->gpr[rb];
335 case 0x12: /* l.jalr */
336 regs->pc = regs->gpr[rb];
337 regs->gpr[9] = regs->pc + 8;
347 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
352 unsigned long orig_pc;
355 const struct exception_table_entry *entry;
358 adjust_pc(regs, address);
360 ra = (insn >> 16) & 0x1f;
361 rd = (insn >> 21) & 0x1f;
363 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
365 if ((unsigned long)lwa_addr & 0x3) {
366 do_unaligned_access(regs, address);
370 if (get_user(value, lwa_addr)) {
371 if (user_mode(regs)) {
376 if ((entry = search_exception_tables(orig_pc))) {
377 regs->pc = entry->fixup;
381 /* kernel access in kernel space, load it directly */
382 value = *((unsigned long *)lwa_addr);
386 regs->gpr[rd] = value;
389 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
392 unsigned long __user *vaddr;
393 unsigned long orig_pc;
397 const struct exception_table_entry *entry;
400 adjust_pc(regs, address);
402 ra = (insn >> 16) & 0x1f;
403 rb = (insn >> 11) & 0x1f;
404 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
405 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
407 if (!lwa_flag || vaddr != lwa_addr) {
408 regs->sr &= ~SPR_SR_F;
412 if ((unsigned long)vaddr & 0x3) {
413 do_unaligned_access(regs, address);
417 if (put_user(regs->gpr[rb], vaddr)) {
418 if (user_mode(regs)) {
423 if ((entry = search_exception_tables(orig_pc))) {
424 regs->pc = entry->fixup;
428 /* kernel access in kernel space, store it directly */
429 *((unsigned long *)vaddr) = regs->gpr[rb];
433 regs->sr |= SPR_SR_F;
436 #define INSN_LWA 0x1b
437 #define INSN_SWA 0x33
439 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
440 unsigned long address)
443 unsigned int insn = *((unsigned int *)address);
449 simulate_lwa(regs, address, insn);
453 simulate_swa(regs, address, insn);
460 if (user_mode(regs)) {
462 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
463 } else { /* Kernel mode */
464 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
466 show_registers(regs);
467 die("Die:", regs, address);