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)
253 force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address, current);
258 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
260 if (user_mode(regs)) {
262 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address, current);
264 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
265 show_registers(regs);
266 die("Die:", regs, address);
271 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
273 if (user_mode(regs)) {
275 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
276 } else { /* Kernel mode */
277 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
278 show_registers(regs);
279 die("Die:", regs, address);
283 static inline int in_delay_slot(struct pt_regs *regs)
285 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
286 /* No delay slot flag, do the old way */
287 unsigned int op, insn;
289 insn = *((unsigned int *)regs->pc);
293 case 0x01: /* l.jal */
294 case 0x03: /* l.bnf */
295 case 0x04: /* l.bf */
296 case 0x11: /* l.jr */
297 case 0x12: /* l.jalr */
303 return mfspr(SPR_SR) & SPR_SR_DSX;
307 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
310 unsigned int rb, op, jmp;
312 if (unlikely(in_delay_slot(regs))) {
313 /* In delay slot, instruction at pc is a branch, simulate it */
314 jmp = *((unsigned int *)regs->pc);
316 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
317 rb = (jmp & 0x0000ffff) >> 11;
322 regs->pc += displacement;
324 case 0x01: /* l.jal */
325 regs->pc += displacement;
326 regs->gpr[9] = regs->pc + 8;
328 case 0x03: /* l.bnf */
329 if (regs->sr & SPR_SR_F)
332 regs->pc += displacement;
334 case 0x04: /* l.bf */
335 if (regs->sr & SPR_SR_F)
336 regs->pc += displacement;
340 case 0x11: /* l.jr */
341 regs->pc = regs->gpr[rb];
343 case 0x12: /* l.jalr */
344 regs->pc = regs->gpr[rb];
345 regs->gpr[9] = regs->pc + 8;
355 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
360 unsigned long orig_pc;
363 const struct exception_table_entry *entry;
366 adjust_pc(regs, address);
368 ra = (insn >> 16) & 0x1f;
369 rd = (insn >> 21) & 0x1f;
371 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
373 if ((unsigned long)lwa_addr & 0x3) {
374 do_unaligned_access(regs, address);
378 if (get_user(value, lwa_addr)) {
379 if (user_mode(regs)) {
380 force_sig(SIGSEGV, current);
384 if ((entry = search_exception_tables(orig_pc))) {
385 regs->pc = entry->fixup;
389 /* kernel access in kernel space, load it directly */
390 value = *((unsigned long *)lwa_addr);
394 regs->gpr[rd] = value;
397 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
400 unsigned long __user *vaddr;
401 unsigned long orig_pc;
405 const struct exception_table_entry *entry;
408 adjust_pc(regs, address);
410 ra = (insn >> 16) & 0x1f;
411 rb = (insn >> 11) & 0x1f;
412 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
413 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
415 if (!lwa_flag || vaddr != lwa_addr) {
416 regs->sr &= ~SPR_SR_F;
420 if ((unsigned long)vaddr & 0x3) {
421 do_unaligned_access(regs, address);
425 if (put_user(regs->gpr[rb], vaddr)) {
426 if (user_mode(regs)) {
427 force_sig(SIGSEGV, current);
431 if ((entry = search_exception_tables(orig_pc))) {
432 regs->pc = entry->fixup;
436 /* kernel access in kernel space, store it directly */
437 *((unsigned long *)vaddr) = regs->gpr[rb];
441 regs->sr |= SPR_SR_F;
444 #define INSN_LWA 0x1b
445 #define INSN_SWA 0x33
447 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
448 unsigned long address)
451 unsigned int insn = *((unsigned int *)address);
457 simulate_lwa(regs, address, insn);
461 simulate_swa(regs, address, insn);
468 if (user_mode(regs)) {
470 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address, current);
471 } else { /* Kernel mode */
472 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
474 show_registers(regs);
475 die("Die:", regs, address);