[deliverable/linux.git] / arch / c6x / kernel / traps.c

/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.h>
#include <linux/bug.h>

#include <asm/soc.h>
#include <asm/special_insns.h>
#include <asm/traps.h>

int (*c6x_nmi_handler)(struct pt_regs *regs);

void __init trap_init(void)
{
	ack_exception(EXCEPT_TYPE_NXF);
	ack_exception(EXCEPT_TYPE_EXC);
	ack_exception(EXCEPT_TYPE_IXF);
	ack_exception(EXCEPT_TYPE_SXF);
	enable_exception();
}

void show_regs(struct pt_regs *regs)
{
	pr_err("\n");
	show_regs_print_info(KERN_ERR);
	pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
	pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
	pr_err("A0: %08lx  B0: %08lx\n", regs->a0, regs->b0);
	pr_err("A1: %08lx  B1: %08lx\n", regs->a1, regs->b1);
	pr_err("A2: %08lx  B2: %08lx\n", regs->a2, regs->b2);
	pr_err("A3: %08lx  B3: %08lx\n", regs->a3, regs->b3);
	pr_err("A4: %08lx  B4: %08lx\n", regs->a4, regs->b4);
	pr_err("A5: %08lx  B5: %08lx\n", regs->a5, regs->b5);
	pr_err("A6: %08lx  B6: %08lx\n", regs->a6, regs->b6);
	pr_err("A7: %08lx  B7: %08lx\n", regs->a7, regs->b7);
	pr_err("A8: %08lx  B8: %08lx\n", regs->a8, regs->b8);
	pr_err("A9: %08lx  B9: %08lx\n", regs->a9, regs->b9);
	pr_err("A10: %08lx  B10: %08lx\n", regs->a10, regs->b10);
	pr_err("A11: %08lx  B11: %08lx\n", regs->a11, regs->b11);
	pr_err("A12: %08lx  B12: %08lx\n", regs->a12, regs->b12);
	pr_err("A13: %08lx  B13: %08lx\n", regs->a13, regs->b13);
	pr_err("A14: %08lx  B14: %08lx\n", regs->a14, regs->dp);
	pr_err("A15: %08lx  B15: %08lx\n", regs->a15, regs->sp);
	pr_err("A16: %08lx  B16: %08lx\n", regs->a16, regs->b16);
	pr_err("A17: %08lx  B17: %08lx\n", regs->a17, regs->b17);
	pr_err("A18: %08lx  B18: %08lx\n", regs->a18, regs->b18);
	pr_err("A19: %08lx  B19: %08lx\n", regs->a19, regs->b19);
	pr_err("A20: %08lx  B20: %08lx\n", regs->a20, regs->b20);
	pr_err("A21: %08lx  B21: %08lx\n", regs->a21, regs->b21);
	pr_err("A22: %08lx  B22: %08lx\n", regs->a22, regs->b22);
	pr_err("A23: %08lx  B23: %08lx\n", regs->a23, regs->b23);
	pr_err("A24: %08lx  B24: %08lx\n", regs->a24, regs->b24);
	pr_err("A25: %08lx  B25: %08lx\n", regs->a25, regs->b25);
	pr_err("A26: %08lx  B26: %08lx\n", regs->a26, regs->b26);
	pr_err("A27: %08lx  B27: %08lx\n", regs->a27, regs->b27);
	pr_err("A28: %08lx  B28: %08lx\n", regs->a28, regs->b28);
	pr_err("A29: %08lx  B29: %08lx\n", regs->a29, regs->b29);
	pr_err("A30: %08lx  B30: %08lx\n", regs->a30, regs->b30);
	pr_err("A31: %08lx  B31: %08lx\n", regs->a31, regs->b31);
}

void die(char *str, struct pt_regs *fp, int nr)
{
	console_verbose();
	pr_err("%s: %08x\n", str, nr);
	show_regs(fp);

	pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
	       current->comm, current->pid, (PAGE_SIZE +
					     (unsigned long) current));

	dump_stack();
	while (1)
		;
}

static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
{
	if (user_mode(fp))
		return;

	die(str, fp, nr);
}


/* Internal exceptions */
static struct exception_info iexcept_table[10] = {
	{ "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
	{ "Oops - fetch packet", SIGBUS, BUS_ADRERR },
	{ "Oops - execute packet", SIGILL, ILL_ILLOPC },
	{ "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
	{ "Oops - resource conflict", SIGILL, ILL_ILLOPC },
	{ "Oops - resource access", SIGILL, ILL_PRVREG },
	{ "Oops - privilege", SIGILL, ILL_PRVOPC },
	{ "Oops - loops buffer", SIGILL, ILL_ILLOPC },
	{ "Oops - software exception", SIGILL, ILL_ILLTRP },
	{ "Oops - unknown exception", SIGILL, ILL_ILLOPC }
};

/* External exceptions */
static struct exception_info eexcept_table[128] = {
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },

	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },

	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },

	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	{ "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
	{ "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
	{ "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
	{ "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
	{ "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
	{ "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
	{ "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
	{ "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
	{ "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
};

static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
{
	unsigned long addr = instruction_pointer(regs);
	siginfo_t info;

	if (except_info->code != TRAP_BRKPT)
		pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
		       except_info->kernel_str, regs->pc,
		       except_info->signo, except_info->code);

	die_if_kernel(except_info->kernel_str, regs, addr);

	info.si_signo = except_info->signo;
	info.si_errno = 0;
	info.si_code  = except_info->code;
	info.si_addr  = (void __user *)addr;

	force_sig_info(except_info->signo, &info, current);
}

/*
 * Process an internal exception (non maskable)
 */
static int process_iexcept(struct pt_regs *regs)
{
	unsigned int iexcept_report = get_iexcept();
	unsigned int iexcept_num;

	ack_exception(EXCEPT_TYPE_IXF);

	pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);

	while (iexcept_report) {
		iexcept_num = __ffs(iexcept_report);
		iexcept_report &= ~(1 << iexcept_num);
		set_iexcept(iexcept_report);
		if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
			/* This is a breakpoint */
			struct exception_info bkpt_exception = {
				"Oops - undefined instruction",
				  SIGTRAP, TRAP_BRKPT
			};
			do_trap(&bkpt_exception, regs);
			iexcept_report &= ~(0xFF);
			set_iexcept(iexcept_report);
			continue;
		}

		do_trap(&iexcept_table[iexcept_num], regs);
	}
	return 0;
}

/*
 * Process an external exception (maskable)
 */
static void process_eexcept(struct pt_regs *regs)
{
	int evt;

	pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);

	while ((evt = soc_get_exception()) >= 0)
		do_trap(&eexcept_table[evt], regs);

	ack_exception(EXCEPT_TYPE_EXC);
}

/*
 * Main exception processing
 */
asmlinkage int process_exception(struct pt_regs *regs)
{
	unsigned int type;
	unsigned int type_num;
	unsigned int ie_num = 9; /* default is unknown exception */

	while ((type = get_except_type()) != 0) {
		type_num = fls(type) - 1;

		switch (type_num) {
		case EXCEPT_TYPE_NXF:
			ack_exception(EXCEPT_TYPE_NXF);
			if (c6x_nmi_handler)
				(c6x_nmi_handler)(regs);
			else
				pr_alert("NMI interrupt!\n");
			break;

		case EXCEPT_TYPE_IXF:
			if (process_iexcept(regs))
				return 1;
			break;

		case EXCEPT_TYPE_EXC:
			process_eexcept(regs);
			break;

		case EXCEPT_TYPE_SXF:
			ie_num = 8;
		default:
			ack_exception(type_num);
			do_trap(&iexcept_table[ie_num], regs);
			break;
		}
	}
	return 0;
}

static int kstack_depth_to_print = 48;

static void show_trace(unsigned long *stack, unsigned long *endstack)
{
	unsigned long addr;
	int i;

	pr_debug("Call trace:");
	i = 0;
	while (stack + 1 <= endstack) {
		addr = *stack++;
		/*
		 * If the address is either in the text segment of the
		 * kernel, or in the region which contains vmalloc'ed
		 * memory, it *may* be the address of a calling
		 * routine; if so, print it so that someone tracing
		 * down the cause of the crash will be able to figure
		 * out the call path that was taken.
		 */
		if (__kernel_text_address(addr)) {
#ifndef CONFIG_KALLSYMS
			if (i % 5 == 0)
				pr_debug("\n	    ");
#endif
			pr_debug(" [<%08lx>]", addr);
			print_symbol(" %s\n", addr);
			i++;
		}
	}
	pr_debug("\n");
}

void show_stack(struct task_struct *task, unsigned long *stack)
{
	unsigned long *p, *endstack;
	int i;

	if (!stack) {
		if (task && task != current)
			/* We know this is a kernel stack,
			   so this is the start/end */
			stack = (unsigned long *)thread_saved_ksp(task);
		else
			stack = (unsigned long *)&stack;
	}
	endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
				     & -THREAD_SIZE);

	pr_debug("Stack from %08lx:", (unsigned long)stack);
	for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
		if (p + 1 > endstack)
			break;
		if (i % 8 == 0)
			pr_cont("\n	    ");
		pr_cont(" %08lx", *p++);
	}
	pr_cont("\n");
	show_trace(stack, endstack);
}

int is_valid_bugaddr(unsigned long addr)
{
	return __kernel_text_address(addr);
}
Commit	Line	Data
e94e6682 AJ	1	/*
	2	* Port on Texas Instruments TMS320C6x architecture
	3	*
	4	* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
	5	* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/module.h>
	12	#include <linux/ptrace.h>
	13	#include <linux/kallsyms.h>
	14	#include <linux/bug.h>
	15
	16	#include <asm/soc.h>
6a846f3f	17	#include <asm/special_insns.h>
e94e6682 AJ	18	#include <asm/traps.h>
	19
	20	int (c6x_nmi_handler)(struct pt_regs regs);
	21
	22	void __init trap_init(void)
	23	{
	24	ack_exception(EXCEPT_TYPE_NXF);
	25	ack_exception(EXCEPT_TYPE_EXC);
	26	ack_exception(EXCEPT_TYPE_IXF);
	27	ack_exception(EXCEPT_TYPE_SXF);
	28	enable_exception();
	29	}
	30
	31	void show_regs(struct pt_regs *regs)
	32	{
	33	pr_err("\n");
a43cb95d	34	show_regs_print_info(KERN_ERR);
e94e6682 AJ	35	pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
	36	pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
	37	pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
	38	pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
	39	pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
	40	pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
	41	pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
	42	pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
	43	pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
	44	pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
	45	pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
	46	pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
	47	pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
	48	pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
	49	pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
	50	pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
	51	pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
	52	pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
	53	pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
	54	pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
	55	pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
	56	pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
	57	pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
	58	pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
	59	pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
	60	pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
	61	pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
	62	pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
	63	pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
	64	pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
	65	pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
	66	pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
	67	pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
	68	pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
	69	}
	70
e94e6682 AJ	71	void die(char str, struct pt_regs fp, int nr)
	72	{
	73	console_verbose();
	74	pr_err("%s: %08x\n", str, nr);
	75	show_regs(fp);
	76
	77	pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
	78	current->comm, current->pid, (PAGE_SIZE +
	79	(unsigned long) current));
	80
	81	dump_stack();
	82	while (1)
	83	;
	84	}
	85
	86	static void die_if_kernel(char str, struct pt_regs fp, int nr)
	87	{
	88	if (user_mode(fp))
	89	return;
	90
	91	die(str, fp, nr);
	92	}
	93
	94
	95	/* Internal exceptions */
	96	static struct exception_info iexcept_table[10] = {
	97	{ "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
	98	{ "Oops - fetch packet", SIGBUS, BUS_ADRERR },
	99	{ "Oops - execute packet", SIGILL, ILL_ILLOPC },
	100	{ "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
	101	{ "Oops - resource conflict", SIGILL, ILL_ILLOPC },
	102	{ "Oops - resource access", SIGILL, ILL_PRVREG },
	103	{ "Oops - privilege", SIGILL, ILL_PRVOPC },
	104	{ "Oops - loops buffer", SIGILL, ILL_ILLOPC },
	105	{ "Oops - software exception", SIGILL, ILL_ILLTRP },
	106	{ "Oops - unknown exception", SIGILL, ILL_ILLOPC }
	107	};
	108
	109	/* External exceptions */
	110	static struct exception_info eexcept_table[128] = {
	111	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	112	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	113	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	114	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	115	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	116	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	117	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	118	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	119	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	120	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	121	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	122	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	123	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	124	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	125	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	126	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	127	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	128	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	129	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	130	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	131	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	132	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	133	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
	134	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
135	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
136	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
137	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
138	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
139	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
140	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
141	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
142	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
143
144	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
145	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
146	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
147	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
148	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
149	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
150	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
151	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
152	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
153	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
154	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
155	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
156	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
157	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
158	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
159	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
160	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
161	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
162	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
163	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
164	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
165	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
166	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
167	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
168	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
169	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
170	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
171	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
172	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
173	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
174	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
175	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
176
177	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
178	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
179	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
180	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
181	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
182	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
183	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
184	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
185	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
186	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
187	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
188	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
189	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
190	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
191	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
192	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
193	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
194	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
195	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
196	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
197	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
198	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
199	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
200	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
201	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
202	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
203	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
204	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
205	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
206	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
207	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
208	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
209
210	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
211	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
212	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
213	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
214	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
215	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
216	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
217	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
218	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
219	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
220	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
221	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
222	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
223	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
224	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
225	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
226	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
227	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
228	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
229	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
230	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
231	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
232	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
233	{ "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
234	{ "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
235	{ "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
236	{ "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
237	{ "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
238	{ "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
239	{ "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
240	{ "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
241	{ "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
242	};
243
244	static void do_trap(struct exception_info except_info, struct pt_regs regs)
245	{
246	unsigned long addr = instruction_pointer(regs);
247	siginfo_t info;
248
249	if (except_info->code != TRAP_BRKPT)
250	pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
251	except_info->kernel_str, regs->pc,
252	except_info->signo, except_info->code);
253
254	die_if_kernel(except_info->kernel_str, regs, addr);
255
256	info.si_signo = except_info->signo;
257	info.si_errno = 0;
258	info.si_code = except_info->code;
259	info.si_addr = (void __user *)addr;
260
261	force_sig_info(except_info->signo, &info, current);
262	}
263
264	/*
265	* Process an internal exception (non maskable)
266	*/
267	static int process_iexcept(struct pt_regs *regs)
268	{
269	unsigned int iexcept_report = get_iexcept();
270	unsigned int iexcept_num;
271
272	ack_exception(EXCEPT_TYPE_IXF);
273
274	pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
275
276	while (iexcept_report) {
277	iexcept_num = __ffs(iexcept_report);
278	iexcept_report &= ~(1 << iexcept_num);
279	set_iexcept(iexcept_report);
280	if ((unsigned int )regs->pc == BKPT_OPCODE) {
281	/* This is a breakpoint */
282	struct exception_info bkpt_exception = {
283	"Oops - undefined instruction",
284	SIGTRAP, TRAP_BRKPT
285	};
286	do_trap(&bkpt_exception, regs);
287	iexcept_report &= ~(0xFF);
288	set_iexcept(iexcept_report);
289	continue;
290	}
291
292	do_trap(&iexcept_table[iexcept_num], regs);
293	}
294	return 0;
295	}
296
297	/*
298	* Process an external exception (maskable)
299	*/
300	static void process_eexcept(struct pt_regs *regs)
301	{
302	int evt;
303
304	pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
305
306	while ((evt = soc_get_exception()) >= 0)
307	do_trap(&eexcept_table[evt], regs);
308
309	ack_exception(EXCEPT_TYPE_EXC);
310	}
311
312	/*
313	* Main exception processing
314	*/
315	asmlinkage int process_exception(struct pt_regs *regs)
316	{
317	unsigned int type;
318	unsigned int type_num;
319	unsigned int ie_num = 9; /* default is unknown exception */
320
321	while ((type = get_except_type()) != 0) {
322	type_num = fls(type) - 1;
323
324	switch (type_num) {
325	case EXCEPT_TYPE_NXF:
326	ack_exception(EXCEPT_TYPE_NXF);
327	if (c6x_nmi_handler)
328	(c6x_nmi_handler)(regs);
329	else
330	pr_alert("NMI interrupt!\n");
331	break;
332
333	case EXCEPT_TYPE_IXF:
334	if (process_iexcept(regs))
335	return 1;
336	break;
337
338	case EXCEPT_TYPE_EXC:
339	process_eexcept(regs);
340	break;
341
342	case EXCEPT_TYPE_SXF:
343	ie_num = 8;
344	default:
345	ack_exception(type_num);
346	do_trap(&iexcept_table[ie_num], regs);
347	break;
348	}
349	}
350	return 0;
351	}
352
353	static int kstack_depth_to_print = 48;
354
355	static void show_trace(unsigned long stack, unsigned long endstack)
356	{
357	unsigned long addr;
358	int i;
359
360	pr_debug("Call trace:");
361	i = 0;
362	while (stack + 1 <= endstack) {
363	addr = *stack++;
364	/*
365	* If the address is either in the text segment of the
366	* kernel, or in the region which contains vmalloc'ed
367	* memory, it may be the address of a calling
368	* routine; if so, print it so that someone tracing
369	* down the cause of the crash will be able to figure
370	* out the call path that was taken.
371	*/
372	if (__kernel_text_address(addr)) {
373	#ifndef CONFIG_KALLSYMS
374	if (i % 5 == 0)
375	pr_debug("\n ");
376	#endif
377	pr_debug(" [<%08lx>]", addr);
378	print_symbol(" %s\n", addr);
379	i++;
380	}
381	}
382	pr_debug("\n");
383	}
384
385	void show_stack(struct task_struct task, unsigned long stack)
386	{
387	unsigned long p, endstack;
388	int i;
389
390	if (!stack) {
391	if (task && task != current)
392	/* We know this is a kernel stack,
393	so this is the start/end */
394	stack = (unsigned long *)thread_saved_ksp(task);
395	else
396	stack = (unsigned long *)&stack;
397	}
398	endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
399	& -THREAD_SIZE);
400
401	pr_debug("Stack from %08lx:", (unsigned long)stack);
402	for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
403	if (p + 1 > endstack)
404	break;
405	if (i % 8 == 0)
406	pr_cont("\n ");
407	pr_cont(" %08lx", *p++);
408	}
409	pr_cont("\n");
410	show_trace(stack, endstack);
411	}
412
413	int is_valid_bugaddr(unsigned long addr)
414	{
415	return __kernel_text_address(addr);
416	}