OpenRISC: Traps

/*

 * OpenRISC traps.c

 *

 * Linux architectural port borrowing liberally from similar works of

 * others.  All original copyrights apply as per the original source

 * declaration.

 *

 * Modifications for the OpenRISC architecture:

 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>

 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>

 *

 *      This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 *

 *  Here we handle the break vectors not used by the system call

 *  mechanism, as well as some general stack/register dumping

 *  things.

 *

 */

#include <linux/init.h>

#include <linux/sched.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/kmod.h>

#include <linux/string.h>

#include <linux/errno.h>

#include <linux/ptrace.h>

#include <linux/timer.h>

#include <linux/mm.h>

#include <linux/kallsyms.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/segment.h>

#include <asm/io.h>

#include <asm/pgtable.h>

extern char _etext, _stext;

int kstack_depth_to_print = 0x180;

static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)

{

	return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;

}

void show_trace(struct task_struct *task, unsigned long *stack)

{

	struct thread_info *context;

	unsigned long addr;

	context = (struct thread_info *)

	    ((unsigned long)stack & (~(THREAD_SIZE - 1)));

	while (valid_stack_ptr(context, stack)) {

		addr = *stack++;

		if (__kernel_text_address(addr)) {

			printk(" [<%08lx>]", addr);

			print_symbol(" %s", addr);

			printk("\n");

		}

	}

	printk(" =======================\n");

}

/* displays a short stack trace */

void show_stack(struct task_struct *task, unsigned long *esp)

{

	unsigned long addr, *stack;

	int i;

	if (esp == NULL)

		esp = (unsigned long *)&esp;

	stack = esp;

	printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);

	for (i = 0; i < kstack_depth_to_print; i++) {

		if (kstack_end(stack))

			break;

		if (__get_user(addr, stack)) {

			/* This message matches "failing address" marked

			   s390 in ksymoops, so lines containing it will

			   not be filtered out by ksymoops.  */

			printk("Failing address 0x%lx\n", (unsigned long)stack);

			break;

		}

		stack++;

		printk("sp + %02d: 0x%08lx\n", i * 4, addr);

	}

	printk("\n");

	show_trace(task, esp);

	return;

}

void show_trace_task(struct task_struct *tsk)

{

	/*

	 * TODO: SysRq-T trace dump...

	 */

}

/*

 * The architecture-independent backtrace generator

 */

void dump_stack(void)

{

	unsigned long stack;

	show_stack(current, &stack);

}

void show_registers(struct pt_regs *regs)

{

	int i;

	int in_kernel = 1;

	unsigned long esp;

	esp = (unsigned long)(&regs->sp);

	if (user_mode(regs))

		in_kernel = 0;

	printk("CPU #: %d\n"

	       "   PC: %08lx    SR: %08lx    SP: %08lx\n",

	       smp_processor_id(), regs->pc, regs->sr, regs->sp);

	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",

	       0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);

	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",

	       regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);

	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",

	       regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);

	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",

	       regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);

	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",

	       regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);

	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",

	       regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);

	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",

	       regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);

	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",

	       regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);

	printk("  RES: %08lx oGPR11: %08lx syscallno: %08lx\n",

	       regs->gpr[11], regs->orig_gpr11, regs->syscallno);

	printk("Process %s (pid: %d, stackpage=%08lx)\n",

	       current->comm, current->pid, (unsigned long)current);

	/*

	 * When in-kernel, we also print out the stack and code at the

	 * time of the fault..

	 */

	if (in_kernel) {

		printk("\nStack: ");

		show_stack(NULL, (unsigned long *)esp);

		printk("\nCode: ");

		if (regs->pc < PAGE_OFFSET)

			goto bad;

		for (i = -24; i < 24; i++) {

			unsigned char c;

			if (__get_user(c, &((unsigned char *)regs->pc)[i])) {

bad:

				printk(" Bad PC value.");

				break;

			}

			if (i == 0)

				printk("(%02x) ", c);

			else

				printk("%02x ", c);

		}

	}

	printk("\n");

}

void nommu_dump_state(struct pt_regs *regs,

		      unsigned long ea, unsigned long vector)

{

	int i;

	unsigned long addr, stack = regs->sp;

	printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);

	printk("CPU #: %d\n"

	       "   PC: %08lx    SR: %08lx    SP: %08lx\n",

	       0, regs->pc, regs->sr, regs->sp);

	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",

	       0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);

	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",

	       regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);

	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",

	       regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);

	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",

	       regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);

	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",

	       regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);

	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",

	       regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);

	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",

	       regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);

	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",

	       regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);

	printk("  RES: %08lx oGPR11: %08lx syscallno: %08lx\n",

	       regs->gpr[11], regs->orig_gpr11, regs->syscallno);

	printk("Process %s (pid: %d, stackpage=%08lx)\n",

	       ((struct task_struct *)(__pa(current)))->comm,

	       ((struct task_struct *)(__pa(current)))->pid,

	       (unsigned long)current);

	printk("\nStack: ");

	printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);

	for (i = 0; i < kstack_depth_to_print; i++) {

		if (((long)stack & (THREAD_SIZE - 1)) == 0)

			break;

		stack++;

		printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,

		       *((unsigned long *)(__pa(stack))));

	}

	printk("\n");

	printk("Call Trace:   ");

	i = 1;

	while (((long)stack & (THREAD_SIZE - 1)) != 0) {

		addr = *((unsigned long *)__pa(stack));

		stack++;

		if (kernel_text_address(addr)) {

			if (i && ((i % 6) == 0))

				printk("\n ");

			printk(" [<%08lx>]", addr);

			i++;

		}

	}

	printk("\n");

	printk("\nCode: ");

	for (i = -24; i < 24; i++) {

		unsigned char c;

		c = ((unsigned char *)(__pa(regs->pc)))[i];

		if (i == 0)

			printk("(%02x) ", c);

		else

			printk("%02x ", c);

	}

	printk("\n");

}

/* This is normally the 'Oops' routine */

void die(const char *str, struct pt_regs *regs, long err)

{

	console_verbose();

	printk("\n%s#: %04lx\n", str, err & 0xffff);

	show_registers(regs);

#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION

	printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");

	/* shut down interrupts */

	local_irq_disable();

	__asm__ __volatile__("l.nop   1");

	do {} while (1);

#endif

	do_exit(SIGSEGV);

}

/* This is normally the 'Oops' routine */

void die_if_kernel(const char *str, struct pt_regs *regs, long err)

{

	if (user_mode(regs))

		return;

	die(str, regs, err);

}

void unhandled_exception(struct pt_regs *regs, int ea, int vector)

{

	printk("Unable to handle exception at EA =0x%x, vector 0x%x",

	       ea, vector);

	die("Oops", regs, 9);

}

void __init trap_init(void)

{

	/* Nothing needs to be done */

}

asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)

{

	siginfo_t info;

	memset(&info, 0, sizeof(info));

	info.si_signo = SIGTRAP;

	info.si_code = TRAP_TRACE;

	info.si_addr = (void *)address;

	force_sig_info(SIGTRAP, &info, current);

	regs->pc += 4;

}

asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)

{

	siginfo_t info;

	if (user_mode(regs)) {

		/* Send a SIGSEGV */

		info.si_signo = SIGSEGV;

		info.si_errno = 0;

		/* info.si_code has been set above */

		info.si_addr = (void *)address;

		force_sig_info(SIGSEGV, &info, current);

	} else {

		printk("KERNEL: Unaligned Access 0x%.8lx\n", address);

		show_registers(regs);

		die("Die:", regs, address);

	}

}

asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)

{

	siginfo_t info;

	if (user_mode(regs)) {

		/* Send a SIGBUS */

		info.si_signo = SIGBUS;

		info.si_errno = 0;

		info.si_code = BUS_ADRERR;

		info.si_addr = (void *)address;

		force_sig_info(SIGBUS, &info, current);

	} else {		/* Kernel mode */

		printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);

		show_registers(regs);

		die("Die:", regs, address);

	}

}

asmlinkage void do_illegal_instruction(struct pt_regs *regs,

				       unsigned long address)

{

	siginfo_t info;

	if (user_mode(regs)) {

		/* Send a SIGILL */

		info.si_signo = SIGILL;

		info.si_errno = 0;

		info.si_code = ILL_ILLOPC;

		info.si_addr = (void *)address;

		force_sig_info(SIGBUS, &info, current);

	} else {		/* Kernel mode */

		printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",

		       address);

		show_registers(regs);

		die("Die:", regs, address);

	}

}