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 FPCSR: %08lx\n",
79 smp_processor_id(), regs->pc, regs->sr, regs->sp,
81 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
82 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
83 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
84 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
85 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
86 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
87 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
88 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
89 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
90 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
91 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
92 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
93 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
94 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
95 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
96 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
97 printk(" RES: %08lx oGPR11: %08lx\n",
98 regs->gpr[11], regs->orig_gpr11);
100 printk("Process %s (pid: %d, stackpage=%08lx)\n",
101 current->comm, current->pid, (unsigned long)current);
103 * When in-kernel, we also print out the stack and code at the
104 * time of the fault..
109 show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
111 if (esp < PAGE_OFFSET)
115 for (i = -8; i < 24; i += 1) {
118 if (__get_user(word, &((unsigned long *)esp)[i])) {
120 printk(" Bad Stack value.");
124 print_data(esp, word, i);
128 if (regs->pc < PAGE_OFFSET)
131 for (i = -6; i < 6; i += 1) {
134 if (__get_user(word, &((unsigned long *)regs->pc)[i])) {
136 printk(" Bad PC value.");
140 print_data(regs->pc, word, i);
146 void nommu_dump_state(struct pt_regs *regs,
147 unsigned long ea, unsigned long vector)
150 unsigned long addr, stack = regs->sp;
152 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
155 " PC: %08lx SR: %08lx SP: %08lx\n",
156 0, regs->pc, regs->sr, regs->sp);
157 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
158 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
159 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
160 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
161 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
162 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
163 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
164 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
165 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
166 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
167 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
168 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
169 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
170 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
171 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
172 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
173 printk(" RES: %08lx oGPR11: %08lx\n",
174 regs->gpr[11], regs->orig_gpr11);
176 printk("Process %s (pid: %d, stackpage=%08lx)\n",
177 ((struct task_struct *)(__pa(current)))->comm,
178 ((struct task_struct *)(__pa(current)))->pid,
179 (unsigned long)current);
182 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
183 for (i = 0; i < kstack_depth_to_print; i++) {
184 if (((long)stack & (THREAD_SIZE - 1)) == 0)
188 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
189 *((unsigned long *)(__pa(stack))));
193 printk("Call Trace: ");
195 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
196 addr = *((unsigned long *)__pa(stack));
199 if (kernel_text_address(addr)) {
200 if (i && ((i % 6) == 0))
202 printk(" [<%08lx>]", addr);
210 for (i = -24; i < 24; i++) {
213 word = ((unsigned long *)(__pa(regs->pc)))[i];
215 print_data(regs->pc, word, i);
220 /* This is normally the 'Oops' routine */
221 void __noreturn die(const char *str, struct pt_regs *regs, long err)
225 printk("\n%s#: %04lx\n", str, err & 0xffff);
226 show_registers(regs);
227 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
228 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
230 /* shut down interrupts */
233 __asm__ __volatile__("l.nop 1");
236 make_task_dead(SIGSEGV);
239 asmlinkage 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 asmlinkage void do_fpe_trap(struct pt_regs *regs, unsigned long address)
248 int code = FPE_FLTUNK;
249 unsigned long fpcsr = regs->fpcsr;
251 if (fpcsr & SPR_FPCSR_IVF)
253 else if (fpcsr & SPR_FPCSR_OVF)
255 else if (fpcsr & SPR_FPCSR_UNF)
257 else if (fpcsr & SPR_FPCSR_DZF)
259 else if (fpcsr & SPR_FPCSR_IXF)
262 /* Clear all flags */
263 regs->fpcsr &= ~SPR_FPCSR_ALLF;
265 force_sig_fault(SIGFPE, code, (void __user *)regs->pc);
268 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
270 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
273 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
275 if (user_mode(regs)) {
277 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
279 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
280 show_registers(regs);
281 die("Die:", regs, address);
286 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
288 if (user_mode(regs)) {
290 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
291 } else { /* Kernel mode */
292 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
293 show_registers(regs);
294 die("Die:", regs, address);
298 static inline int in_delay_slot(struct pt_regs *regs)
300 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
301 /* No delay slot flag, do the old way */
302 unsigned int op, insn;
304 insn = *((unsigned int *)regs->pc);
308 case 0x01: /* l.jal */
309 case 0x03: /* l.bnf */
310 case 0x04: /* l.bf */
311 case 0x11: /* l.jr */
312 case 0x12: /* l.jalr */
318 return mfspr(SPR_SR) & SPR_SR_DSX;
322 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
325 unsigned int rb, op, jmp;
327 if (unlikely(in_delay_slot(regs))) {
328 /* In delay slot, instruction at pc is a branch, simulate it */
329 jmp = *((unsigned int *)regs->pc);
331 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
332 rb = (jmp & 0x0000ffff) >> 11;
337 regs->pc += displacement;
339 case 0x01: /* l.jal */
340 regs->pc += displacement;
341 regs->gpr[9] = regs->pc + 8;
343 case 0x03: /* l.bnf */
344 if (regs->sr & SPR_SR_F)
347 regs->pc += displacement;
349 case 0x04: /* l.bf */
350 if (regs->sr & SPR_SR_F)
351 regs->pc += displacement;
355 case 0x11: /* l.jr */
356 regs->pc = regs->gpr[rb];
358 case 0x12: /* l.jalr */
359 regs->pc = regs->gpr[rb];
360 regs->gpr[9] = regs->pc + 8;
370 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
375 unsigned long orig_pc;
378 const struct exception_table_entry *entry;
381 adjust_pc(regs, address);
383 ra = (insn >> 16) & 0x1f;
384 rd = (insn >> 21) & 0x1f;
386 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
388 if ((unsigned long)lwa_addr & 0x3) {
389 do_unaligned_access(regs, address);
393 if (get_user(value, lwa_addr)) {
394 if (user_mode(regs)) {
399 if ((entry = search_exception_tables(orig_pc))) {
400 regs->pc = entry->fixup;
404 /* kernel access in kernel space, load it directly */
405 value = *((unsigned long *)lwa_addr);
409 regs->gpr[rd] = value;
412 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
415 unsigned long __user *vaddr;
416 unsigned long orig_pc;
420 const struct exception_table_entry *entry;
423 adjust_pc(regs, address);
425 ra = (insn >> 16) & 0x1f;
426 rb = (insn >> 11) & 0x1f;
427 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
428 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
430 if (!lwa_flag || vaddr != lwa_addr) {
431 regs->sr &= ~SPR_SR_F;
435 if ((unsigned long)vaddr & 0x3) {
436 do_unaligned_access(regs, address);
440 if (put_user(regs->gpr[rb], vaddr)) {
441 if (user_mode(regs)) {
446 if ((entry = search_exception_tables(orig_pc))) {
447 regs->pc = entry->fixup;
451 /* kernel access in kernel space, store it directly */
452 *((unsigned long *)vaddr) = regs->gpr[rb];
456 regs->sr |= SPR_SR_F;
459 #define INSN_LWA 0x1b
460 #define INSN_SWA 0x33
462 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
463 unsigned long address)
466 unsigned int insn = *((unsigned int *)address);
472 simulate_lwa(regs, address, insn);
476 simulate_swa(regs, address, insn);
483 if (user_mode(regs)) {
485 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
486 } else { /* Kernel mode */
487 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
489 show_registers(regs);
490 die("Die:", regs, address);