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/pgtable.h>
35 #include <asm/unwinder.h>
36 #include <asm/sections.h>
38 int kstack_depth_to_print = 0x180;
40 unsigned long __user *lwa_addr;
42 void print_trace(void *data, unsigned long addr, int reliable)
44 pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
48 /* displays a short stack trace */
49 void show_stack(struct task_struct *task, unsigned long *esp)
52 esp = (unsigned long *)&esp;
54 pr_emerg("Call trace:\n");
55 unwind_stack(NULL, esp, print_trace);
58 void show_registers(struct pt_regs *regs)
64 esp = (unsigned long)(regs->sp);
69 " PC: %08lx SR: %08lx SP: %08lx\n",
70 smp_processor_id(), regs->pc, regs->sr, regs->sp);
71 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
72 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
73 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
74 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
75 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
76 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
77 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
78 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
79 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
80 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
81 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
82 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
83 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
84 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
85 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
86 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
87 printk(" RES: %08lx oGPR11: %08lx\n",
88 regs->gpr[11], regs->orig_gpr11);
90 printk("Process %s (pid: %d, stackpage=%08lx)\n",
91 current->comm, current->pid, (unsigned long)current);
93 * When in-kernel, we also print out the stack and code at the
99 show_stack(NULL, (unsigned long *)esp);
102 if (regs->pc < PAGE_OFFSET)
105 for (i = -24; i < 24; i++) {
107 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
109 printk(" Bad PC value.");
114 printk("(%02x) ", c);
122 void nommu_dump_state(struct pt_regs *regs,
123 unsigned long ea, unsigned long vector)
126 unsigned long addr, stack = regs->sp;
128 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
131 " PC: %08lx SR: %08lx SP: %08lx\n",
132 0, 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 ((struct task_struct *)(__pa(current)))->comm,
154 ((struct task_struct *)(__pa(current)))->pid,
155 (unsigned long)current);
158 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
159 for (i = 0; i < kstack_depth_to_print; i++) {
160 if (((long)stack & (THREAD_SIZE - 1)) == 0)
164 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
165 *((unsigned long *)(__pa(stack))));
169 printk("Call Trace: ");
171 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
172 addr = *((unsigned long *)__pa(stack));
175 if (kernel_text_address(addr)) {
176 if (i && ((i % 6) == 0))
178 printk(" [<%08lx>]", addr);
186 for (i = -24; i < 24; i++) {
188 c = ((unsigned char *)(__pa(regs->pc)))[i];
191 printk("(%02x) ", c);
198 /* This is normally the 'Oops' routine */
199 void die(const char *str, struct pt_regs *regs, long err)
203 printk("\n%s#: %04lx\n", str, err & 0xffff);
204 show_registers(regs);
205 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
206 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
208 /* shut down interrupts */
211 __asm__ __volatile__("l.nop 1");
217 /* This is normally the 'Oops' routine */
218 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
226 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
228 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
230 die("Oops", regs, 9);
233 void __init trap_init(void)
235 /* Nothing needs to be done */
238 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
240 force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
245 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
247 if (user_mode(regs)) {
249 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
251 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
252 show_registers(regs);
253 die("Die:", regs, address);
258 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
260 if (user_mode(regs)) {
262 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
263 } else { /* Kernel mode */
264 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
265 show_registers(regs);
266 die("Die:", regs, address);
270 static inline int in_delay_slot(struct pt_regs *regs)
272 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
273 /* No delay slot flag, do the old way */
274 unsigned int op, insn;
276 insn = *((unsigned int *)regs->pc);
280 case 0x01: /* l.jal */
281 case 0x03: /* l.bnf */
282 case 0x04: /* l.bf */
283 case 0x11: /* l.jr */
284 case 0x12: /* l.jalr */
290 return mfspr(SPR_SR) & SPR_SR_DSX;
294 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
297 unsigned int rb, op, jmp;
299 if (unlikely(in_delay_slot(regs))) {
300 /* In delay slot, instruction at pc is a branch, simulate it */
301 jmp = *((unsigned int *)regs->pc);
303 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
304 rb = (jmp & 0x0000ffff) >> 11;
309 regs->pc += displacement;
311 case 0x01: /* l.jal */
312 regs->pc += displacement;
313 regs->gpr[9] = regs->pc + 8;
315 case 0x03: /* l.bnf */
316 if (regs->sr & SPR_SR_F)
319 regs->pc += displacement;
321 case 0x04: /* l.bf */
322 if (regs->sr & SPR_SR_F)
323 regs->pc += displacement;
327 case 0x11: /* l.jr */
328 regs->pc = regs->gpr[rb];
330 case 0x12: /* l.jalr */
331 regs->pc = regs->gpr[rb];
332 regs->gpr[9] = regs->pc + 8;
342 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
347 unsigned long orig_pc;
350 const struct exception_table_entry *entry;
353 adjust_pc(regs, address);
355 ra = (insn >> 16) & 0x1f;
356 rd = (insn >> 21) & 0x1f;
358 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
360 if ((unsigned long)lwa_addr & 0x3) {
361 do_unaligned_access(regs, address);
365 if (get_user(value, lwa_addr)) {
366 if (user_mode(regs)) {
371 if ((entry = search_exception_tables(orig_pc))) {
372 regs->pc = entry->fixup;
376 /* kernel access in kernel space, load it directly */
377 value = *((unsigned long *)lwa_addr);
381 regs->gpr[rd] = value;
384 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
387 unsigned long __user *vaddr;
388 unsigned long orig_pc;
392 const struct exception_table_entry *entry;
395 adjust_pc(regs, address);
397 ra = (insn >> 16) & 0x1f;
398 rb = (insn >> 11) & 0x1f;
399 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
400 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
402 if (!lwa_flag || vaddr != lwa_addr) {
403 regs->sr &= ~SPR_SR_F;
407 if ((unsigned long)vaddr & 0x3) {
408 do_unaligned_access(regs, address);
412 if (put_user(regs->gpr[rb], vaddr)) {
413 if (user_mode(regs)) {
418 if ((entry = search_exception_tables(orig_pc))) {
419 regs->pc = entry->fixup;
423 /* kernel access in kernel space, store it directly */
424 *((unsigned long *)vaddr) = regs->gpr[rb];
428 regs->sr |= SPR_SR_F;
431 #define INSN_LWA 0x1b
432 #define INSN_SWA 0x33
434 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
435 unsigned long address)
438 unsigned int insn = *((unsigned int *)address);
444 simulate_lwa(regs, address, insn);
448 simulate_swa(regs, address, insn);
455 if (user_mode(regs)) {
457 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
458 } else { /* Kernel mode */
459 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
461 show_registers(regs);
462 die("Die:", regs, address);