[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 ([email protected])
 *
 *  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");
	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 dump_stack(void)
{
	unsigned long stack;

	show_stack(current, &stack);
}
EXPORT_SYMBOL(dump_stack);


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 ([email protected])
	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");
	34	pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
	35	pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
	36	pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
	37	pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
	38	pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
	39	pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
	40	pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
	41	pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
	42	pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
	43	pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
	44	pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
	45	pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
	46	pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
	47	pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
	48	pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
	49	pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
	50	pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
	51	pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
	52	pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
	53	pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
	54	pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
	55	pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
	56	pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
	57	pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
	58	pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
	59	pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
	60	pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
	61	pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
	62	pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
	63	pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
	64	pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
	65	pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
	66	pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
	67	pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
	68	}
	69
	70	void dump_stack(void)
	71	{
	72	unsigned long stack;
	73
	74	show_stack(current, &stack);
	75	}
	76	EXPORT_SYMBOL(dump_stack);
	77
	78
	79	void die(char str, struct pt_regs fp, int nr)
	80	{
	81	console_verbose();
82	pr_err("%s: %08x\n", str, nr);
83	show_regs(fp);
84
85	pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
86	current->comm, current->pid, (PAGE_SIZE +
87	(unsigned long) current));
88
89	dump_stack();
90	while (1)
91	;
92	}
93
94	static void die_if_kernel(char str, struct pt_regs fp, int nr)
95	{
96	if (user_mode(fp))
97	return;
98
99	die(str, fp, nr);
100	}
101
102
103	/* Internal exceptions */
104	static struct exception_info iexcept_table[10] = {
105	{ "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
106	{ "Oops - fetch packet", SIGBUS, BUS_ADRERR },
107	{ "Oops - execute packet", SIGILL, ILL_ILLOPC },
108	{ "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
109	{ "Oops - resource conflict", SIGILL, ILL_ILLOPC },
110	{ "Oops - resource access", SIGILL, ILL_PRVREG },
111	{ "Oops - privilege", SIGILL, ILL_PRVOPC },
112	{ "Oops - loops buffer", SIGILL, ILL_ILLOPC },
113	{ "Oops - software exception", SIGILL, ILL_ILLTRP },
114	{ "Oops - unknown exception", SIGILL, ILL_ILLOPC }
115	};
116
117	/* External exceptions */
118	static struct exception_info eexcept_table[128] = {
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	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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
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	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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
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	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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
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 - external exception", SIGBUS, BUS_ADRERR },
234	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
235	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
236	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
237	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
238	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
239	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
240	{ "Oops - external exception", SIGBUS, BUS_ADRERR },
241	{ "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
242	{ "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
243	{ "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
244	{ "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
245	{ "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
246	{ "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
247	{ "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
248	{ "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
249	{ "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
250	};
251
252	static void do_trap(struct exception_info except_info, struct pt_regs regs)
253	{
254	unsigned long addr = instruction_pointer(regs);
255	siginfo_t info;
256
257	if (except_info->code != TRAP_BRKPT)
258	pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
259	except_info->kernel_str, regs->pc,
260	except_info->signo, except_info->code);
261
262	die_if_kernel(except_info->kernel_str, regs, addr);
263
264	info.si_signo = except_info->signo;
265	info.si_errno = 0;
266	info.si_code = except_info->code;
267	info.si_addr = (void __user *)addr;
268
269	force_sig_info(except_info->signo, &info, current);
270	}
271
272	/*
273	* Process an internal exception (non maskable)
274	*/
275	static int process_iexcept(struct pt_regs *regs)
276	{
277	unsigned int iexcept_report = get_iexcept();
278	unsigned int iexcept_num;
279
280	ack_exception(EXCEPT_TYPE_IXF);
281
282	pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
283
284	while (iexcept_report) {
285	iexcept_num = __ffs(iexcept_report);
286	iexcept_report &= ~(1 << iexcept_num);
287	set_iexcept(iexcept_report);
288	if ((unsigned int )regs->pc == BKPT_OPCODE) {
289	/* This is a breakpoint */
290	struct exception_info bkpt_exception = {
291	"Oops - undefined instruction",
292	SIGTRAP, TRAP_BRKPT
293	};
294	do_trap(&bkpt_exception, regs);
295	iexcept_report &= ~(0xFF);
296	set_iexcept(iexcept_report);
297	continue;
298	}
299
300	do_trap(&iexcept_table[iexcept_num], regs);
301	}
302	return 0;
303	}
304
305	/*
306	* Process an external exception (maskable)
307	*/
308	static void process_eexcept(struct pt_regs *regs)
309	{
310	int evt;
311
312	pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
313
314	while ((evt = soc_get_exception()) >= 0)
315	do_trap(&eexcept_table[evt], regs);
316
317	ack_exception(EXCEPT_TYPE_EXC);
318	}
319
320	/*
321	* Main exception processing
322	*/
323	asmlinkage int process_exception(struct pt_regs *regs)
324	{
325	unsigned int type;
326	unsigned int type_num;
327	unsigned int ie_num = 9; /* default is unknown exception */
328
329	while ((type = get_except_type()) != 0) {
330	type_num = fls(type) - 1;
331
332	switch (type_num) {
333	case EXCEPT_TYPE_NXF:
334	ack_exception(EXCEPT_TYPE_NXF);
335	if (c6x_nmi_handler)
336	(c6x_nmi_handler)(regs);
337	else
338	pr_alert("NMI interrupt!\n");
339	break;
340
341	case EXCEPT_TYPE_IXF:
342	if (process_iexcept(regs))
343	return 1;
344	break;
345
346	case EXCEPT_TYPE_EXC:
347	process_eexcept(regs);
348	break;
349
350	case EXCEPT_TYPE_SXF:
351	ie_num = 8;
352	default:
353	ack_exception(type_num);
354	do_trap(&iexcept_table[ie_num], regs);
355	break;
356	}
357	}
358	return 0;
359	}
360
361	static int kstack_depth_to_print = 48;
362
363	static void show_trace(unsigned long stack, unsigned long endstack)
364	{
365	unsigned long addr;
366	int i;
367
368	pr_debug("Call trace:");
369	i = 0;
370	while (stack + 1 <= endstack) {
371	addr = *stack++;
372	/*
373	* If the address is either in the text segment of the
374	* kernel, or in the region which contains vmalloc'ed
375	* memory, it may be the address of a calling
376	* routine; if so, print it so that someone tracing
377	* down the cause of the crash will be able to figure
378	* out the call path that was taken.
379	*/
380	if (__kernel_text_address(addr)) {
381	#ifndef CONFIG_KALLSYMS
382	if (i % 5 == 0)
383	pr_debug("\n ");
384	#endif
385	pr_debug(" [<%08lx>]", addr);
386	print_symbol(" %s\n", addr);
387	i++;
388	}
389	}
390	pr_debug("\n");
391	}
392
393	void show_stack(struct task_struct task, unsigned long stack)
394	{
395	unsigned long p, endstack;
396	int i;
397
398	if (!stack) {
399	if (task && task != current)
400	/* We know this is a kernel stack,
401	so this is the start/end */
402	stack = (unsigned long *)thread_saved_ksp(task);
403	else
404	stack = (unsigned long *)&stack;
405	}
406	endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
407	& -THREAD_SIZE);
408
409	pr_debug("Stack from %08lx:", (unsigned long)stack);
410	for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
411	if (p + 1 > endstack)
412	break;
413	if (i % 8 == 0)
414	pr_cont("\n ");
415	pr_cont(" %08lx", *p++);
416	}
417	pr_cont("\n");
418	show_trace(stack, endstack);
419	}
420
421	int is_valid_bugaddr(unsigned long addr)
422	{
423	return __kernel_text_address(addr);
424	}