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 int kstack_depth_to_print = 0x180;
39 unsigned long __user *lwa_addr;
41 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 /* displays a short stack trace */
50 void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
53 esp = (unsigned long *)&esp;
55 printk("%sCall trace:\n", loglvl);
56 unwind_stack((void *)loglvl, esp, print_trace);
59 void show_registers(struct pt_regs *regs)
65 esp = (unsigned long)(regs->sp);
70 " PC: %08lx SR: %08lx SP: %08lx\n",
71 smp_processor_id(), regs->pc, regs->sr, regs->sp);
72 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
73 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
74 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
75 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
76 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
77 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
78 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
79 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
80 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
81 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
82 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
83 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
84 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
85 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
86 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
87 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
88 printk(" RES: %08lx oGPR11: %08lx\n",
89 regs->gpr[11], regs->orig_gpr11);
91 printk("Process %s (pid: %d, stackpage=%08lx)\n",
92 current->comm, current->pid, (unsigned long)current);
94 * When in-kernel, we also print out the stack and code at the
100 show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
103 if (regs->pc < PAGE_OFFSET)
106 for (i = -24; i < 24; i++) {
108 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
110 printk(" Bad PC value.");
115 printk("(%02x) ", c);
123 void nommu_dump_state(struct pt_regs *regs,
124 unsigned long ea, unsigned long vector)
127 unsigned long addr, stack = regs->sp;
129 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
132 " PC: %08lx SR: %08lx SP: %08lx\n",
133 0, regs->pc, regs->sr, regs->sp);
134 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
135 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
136 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
137 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
138 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
139 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
140 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
141 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
142 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
143 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
144 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
145 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
146 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
147 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
148 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
149 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
150 printk(" RES: %08lx oGPR11: %08lx\n",
151 regs->gpr[11], regs->orig_gpr11);
153 printk("Process %s (pid: %d, stackpage=%08lx)\n",
154 ((struct task_struct *)(__pa(current)))->comm,
155 ((struct task_struct *)(__pa(current)))->pid,
156 (unsigned long)current);
159 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
160 for (i = 0; i < kstack_depth_to_print; i++) {
161 if (((long)stack & (THREAD_SIZE - 1)) == 0)
165 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
166 *((unsigned long *)(__pa(stack))));
170 printk("Call Trace: ");
172 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
173 addr = *((unsigned long *)__pa(stack));
176 if (kernel_text_address(addr)) {
177 if (i && ((i % 6) == 0))
179 printk(" [<%08lx>]", addr);
187 for (i = -24; i < 24; i++) {
189 c = ((unsigned char *)(__pa(regs->pc)))[i];
192 printk("(%02x) ", c);
199 /* This is normally the 'Oops' routine */
200 void die(const char *str, struct pt_regs *regs, long err)
204 printk("\n%s#: %04lx\n", str, err & 0xffff);
205 show_registers(regs);
206 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
207 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
209 /* shut down interrupts */
212 __asm__ __volatile__("l.nop 1");
215 make_task_dead(SIGSEGV);
218 /* This is normally the 'Oops' routine */
219 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
227 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
229 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
231 die("Oops", regs, 9);
234 void __init trap_init(void)
236 /* Nothing needs to be done */
239 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
241 force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
246 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
248 if (user_mode(regs)) {
250 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
252 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
253 show_registers(regs);
254 die("Die:", regs, address);
259 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
261 if (user_mode(regs)) {
263 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
264 } else { /* Kernel mode */
265 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
266 show_registers(regs);
267 die("Die:", regs, address);
271 static inline int in_delay_slot(struct pt_regs *regs)
273 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
274 /* No delay slot flag, do the old way */
275 unsigned int op, insn;
277 insn = *((unsigned int *)regs->pc);
281 case 0x01: /* l.jal */
282 case 0x03: /* l.bnf */
283 case 0x04: /* l.bf */
284 case 0x11: /* l.jr */
285 case 0x12: /* l.jalr */
291 return mfspr(SPR_SR) & SPR_SR_DSX;
295 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
298 unsigned int rb, op, jmp;
300 if (unlikely(in_delay_slot(regs))) {
301 /* In delay slot, instruction at pc is a branch, simulate it */
302 jmp = *((unsigned int *)regs->pc);
304 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
305 rb = (jmp & 0x0000ffff) >> 11;
310 regs->pc += displacement;
312 case 0x01: /* l.jal */
313 regs->pc += displacement;
314 regs->gpr[9] = regs->pc + 8;
316 case 0x03: /* l.bnf */
317 if (regs->sr & SPR_SR_F)
320 regs->pc += displacement;
322 case 0x04: /* l.bf */
323 if (regs->sr & SPR_SR_F)
324 regs->pc += displacement;
328 case 0x11: /* l.jr */
329 regs->pc = regs->gpr[rb];
331 case 0x12: /* l.jalr */
332 regs->pc = regs->gpr[rb];
333 regs->gpr[9] = regs->pc + 8;
343 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
348 unsigned long orig_pc;
351 const struct exception_table_entry *entry;
354 adjust_pc(regs, address);
356 ra = (insn >> 16) & 0x1f;
357 rd = (insn >> 21) & 0x1f;
359 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
361 if ((unsigned long)lwa_addr & 0x3) {
362 do_unaligned_access(regs, address);
366 if (get_user(value, lwa_addr)) {
367 if (user_mode(regs)) {
372 if ((entry = search_exception_tables(orig_pc))) {
373 regs->pc = entry->fixup;
377 /* kernel access in kernel space, load it directly */
378 value = *((unsigned long *)lwa_addr);
382 regs->gpr[rd] = value;
385 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
388 unsigned long __user *vaddr;
389 unsigned long orig_pc;
393 const struct exception_table_entry *entry;
396 adjust_pc(regs, address);
398 ra = (insn >> 16) & 0x1f;
399 rb = (insn >> 11) & 0x1f;
400 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
401 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
403 if (!lwa_flag || vaddr != lwa_addr) {
404 regs->sr &= ~SPR_SR_F;
408 if ((unsigned long)vaddr & 0x3) {
409 do_unaligned_access(regs, address);
413 if (put_user(regs->gpr[rb], vaddr)) {
414 if (user_mode(regs)) {
419 if ((entry = search_exception_tables(orig_pc))) {
420 regs->pc = entry->fixup;
424 /* kernel access in kernel space, store it directly */
425 *((unsigned long *)vaddr) = regs->gpr[rb];
429 regs->sr |= SPR_SR_F;
432 #define INSN_LWA 0x1b
433 #define INSN_SWA 0x33
435 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
436 unsigned long address)
439 unsigned int insn = *((unsigned int *)address);
445 simulate_lwa(regs, address, insn);
449 simulate_swa(regs, address, insn);
456 if (user_mode(regs)) {
458 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
459 } else { /* Kernel mode */
460 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
462 show_registers(regs);
463 die("Die:", regs, address);