[linux-2.6-block.git] / arch / openrisc / kernel / traps.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 *
 *  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/sched/debug.h>
#include <linux/sched/task_stack.h>
#include <linux/kernel.h>
#include <linux/extable.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 <linux/uaccess.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/unwinder.h>
#include <asm/sections.h>

int kstack_depth_to_print = 0x180;
int lwa_flag;
unsigned long __user *lwa_addr;

void print_trace(void *data, unsigned long addr, int reliable)
{
	pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
	       (void *) addr);
}

/* displays a short stack trace */
void show_stack(struct task_struct *task, unsigned long *esp)
{
	if (esp == NULL)
		esp = (unsigned long *)&esp;

	pr_emerg("Call trace:\n");
	unwind_stack(NULL, esp, print_trace);
}

void show_trace_task(struct task_struct *tsk)
{
	/*
	 * TODO: SysRq-T trace dump...
	 */
}

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\n",
	       regs->gpr[11], regs->orig_gpr11);

	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\n",
	       regs->gpr[11], regs->orig_gpr11);

	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)
{
	force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);

	regs->pc += 4;
}

asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
{
	if (user_mode(regs)) {
		/* Send a SIGBUS */
		force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
	} 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)
{
	if (user_mode(regs)) {
		/* Send a SIGBUS */
		force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
	} else {		/* Kernel mode */
		printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
		show_registers(regs);
		die("Die:", regs, address);
	}
}

static inline int in_delay_slot(struct pt_regs *regs)
{
#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
	/* No delay slot flag, do the old way */
	unsigned int op, insn;

	insn = *((unsigned int *)regs->pc);
	op = insn >> 26;
	switch (op) {
	case 0x00: /* l.j */
	case 0x01: /* l.jal */
	case 0x03: /* l.bnf */
	case 0x04: /* l.bf */
	case 0x11: /* l.jr */
	case 0x12: /* l.jalr */
		return 1;
	default:
		return 0;
	}
#else
	return mfspr(SPR_SR) & SPR_SR_DSX;
#endif
}

static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
{
	int displacement;
	unsigned int rb, op, jmp;

	if (unlikely(in_delay_slot(regs))) {
		/* In delay slot, instruction at pc is a branch, simulate it */
		jmp = *((unsigned int *)regs->pc);

		displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
		rb = (jmp & 0x0000ffff) >> 11;
		op = jmp >> 26;

		switch (op) {
		case 0x00: /* l.j */
			regs->pc += displacement;
			return;
		case 0x01: /* l.jal */
			regs->pc += displacement;
			regs->gpr[9] = regs->pc + 8;
			return;
		case 0x03: /* l.bnf */
			if (regs->sr & SPR_SR_F)
				regs->pc += 8;
			else
				regs->pc += displacement;
			return;
		case 0x04: /* l.bf */
			if (regs->sr & SPR_SR_F)
				regs->pc += displacement;
			else
				regs->pc += 8;
			return;
		case 0x11: /* l.jr */
			regs->pc = regs->gpr[rb];
			return;
		case 0x12: /* l.jalr */
			regs->pc = regs->gpr[rb];
			regs->gpr[9] = regs->pc + 8;
			return;
		default:
			break;
		}
	} else {
		regs->pc += 4;
	}
}

static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
				unsigned int insn)
{
	unsigned int ra, rd;
	unsigned long value;
	unsigned long orig_pc;
	long imm;

	const struct exception_table_entry *entry;

	orig_pc = regs->pc;
	adjust_pc(regs, address);

	ra = (insn >> 16) & 0x1f;
	rd = (insn >> 21) & 0x1f;
	imm = (short)insn;
	lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);

	if ((unsigned long)lwa_addr & 0x3) {
		do_unaligned_access(regs, address);
		return;
	}

	if (get_user(value, lwa_addr)) {
		if (user_mode(regs)) {
			force_sig(SIGSEGV);
			return;
		}

		if ((entry = search_exception_tables(orig_pc))) {
			regs->pc = entry->fixup;
			return;
		}

		/* kernel access in kernel space, load it directly */
		value = *((unsigned long *)lwa_addr);
	}

	lwa_flag = 1;
	regs->gpr[rd] = value;
}

static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
				unsigned int insn)
{
	unsigned long __user *vaddr;
	unsigned long orig_pc;
	unsigned int ra, rb;
	long imm;

	const struct exception_table_entry *entry;

	orig_pc = regs->pc;
	adjust_pc(regs, address);

	ra = (insn >> 16) & 0x1f;
	rb = (insn >> 11) & 0x1f;
	imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
	vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);

	if (!lwa_flag || vaddr != lwa_addr) {
		regs->sr &= ~SPR_SR_F;
		return;
	}

	if ((unsigned long)vaddr & 0x3) {
		do_unaligned_access(regs, address);
		return;
	}

	if (put_user(regs->gpr[rb], vaddr)) {
		if (user_mode(regs)) {
			force_sig(SIGSEGV);
			return;
		}

		if ((entry = search_exception_tables(orig_pc))) {
			regs->pc = entry->fixup;
			return;
		}

		/* kernel access in kernel space, store it directly */
		*((unsigned long *)vaddr) = regs->gpr[rb];
	}

	lwa_flag = 0;
	regs->sr |= SPR_SR_F;
}

#define INSN_LWA	0x1b
#define INSN_SWA	0x33

asmlinkage void do_illegal_instruction(struct pt_regs *regs,
				       unsigned long address)
{
	unsigned int op;
	unsigned int insn = *((unsigned int *)address);

	op = insn >> 26;

	switch (op) {
	case INSN_LWA:
		simulate_lwa(regs, address, insn);
		return;

	case INSN_SWA:
		simulate_swa(regs, address, insn);
		return;

	default:
		break;
	}

	if (user_mode(regs)) {
		/* Send a SIGILL */
		force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
	} else {		/* Kernel mode */
		printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
		       address);
		show_registers(regs);
		die("Die:", regs, address);
	}
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
769a8a96 JB	2	/*
	3	* OpenRISC traps.c
	4	*
	5	* Linux architectural port borrowing liberally from similar works of
	6	* others. All original copyrights apply as per the original source
	7	* declaration.
	8	*
	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>
	12	*
769a8a96 JB	13	* Here we handle the break vectors not used by the system call
	14	* mechanism, as well as some general stack/register dumping
	15	* things.
769a8a96 JB	16	*/
	17
	18	#include <linux/init.h>
	19	#include <linux/sched.h>
b17b0153	20	#include <linux/sched/debug.h>
3f8c2452	21	#include <linux/sched/task_stack.h>
769a8a96	22	#include <linux/kernel.h>
ce139ab8	23	#include <linux/extable.h>
769a8a96 JB	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>
	29	#include <linux/mm.h>
	30	#include <linux/kallsyms.h>
7c0f6ba6	31	#include <linux/uaccess.h>
769a8a96	32
769a8a96 JB	33	#include <asm/io.h>
769a8a96 JB	34	#include <asm/pgtable.h>
eecac38b	35	#include <asm/unwinder.h>
ce666d91	36	#include <asm/sections.h>
769a8a96 JB	37
769a8a96 JB	38	int kstack_depth_to_print = 0x180;
63104c06 SK	39	int lwa_flag;
63104c06 SK	40	unsigned long __user *lwa_addr;
769a8a96	41
eecac38b	42	void print_trace(void *data, unsigned long addr, int reliable)
769a8a96	43	{
eecac38b SH	44	pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
eecac38b SH	45	(void *) addr);
769a8a96 JB	46	}
	47
	48	/* displays a short stack trace */
	49	void show_stack(struct task_struct task, unsigned long esp)
	50	{
769a8a96 JB	51	if (esp == NULL)
	52	esp = (unsigned long *)&esp;
	53
eecac38b SH	54	pr_emerg("Call trace:\n");
eecac38b SH	55	unwind_stack(NULL, esp, print_trace);
769a8a96 JB	56	}
	57
	58	void show_trace_task(struct task_struct *tsk)
	59	{
	60	/*
	61	* TODO: SysRq-T trace dump...
	62	*/
	63	}
	64
769a8a96 JB	65	void show_registers(struct pt_regs *regs)
	66	{
	67	int i;
	68	int in_kernel = 1;
	69	unsigned long esp;
	70
eecac38b	71	esp = (unsigned long)(regs->sp);
769a8a96 JB	72	if (user_mode(regs))
	73	in_kernel = 0;
	74
	75	printk("CPU #: %d\n"
	76	" PC: %08lx SR: %08lx SP: %08lx\n",
	77	smp_processor_id(), regs->pc, regs->sr, regs->sp);
	78	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
	79	0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
	80	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
	81	regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
	82	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
	83	regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
	84	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
	85	regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
	86	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
	87	regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
	88	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
	89	regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
	90	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
	91	regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
	92	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
	93	regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
6cbe5e95 JB	94	printk(" RES: %08lx oGPR11: %08lx\n",
6cbe5e95 JB	95	regs->gpr[11], regs->orig_gpr11);
769a8a96 JB	96
	97	printk("Process %s (pid: %d, stackpage=%08lx)\n",
	98	current->comm, current->pid, (unsigned long)current);
	99	/*
	100	* When in-kernel, we also print out the stack and code at the
	101	* time of the fault..
	102	*/
	103	if (in_kernel) {
	104
	105	printk("\nStack: ");
	106	show_stack(NULL, (unsigned long *)esp);
	107
	108	printk("\nCode: ");
	109	if (regs->pc < PAGE_OFFSET)
	110	goto bad;
	111
	112	for (i = -24; i < 24; i++) {
	113	unsigned char c;
	114	if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
	115	bad:
	116	printk(" Bad PC value.");
	117	break;
	118	}
	119
	120	if (i == 0)
	121	printk("(%02x) ", c);
	122	else
	123	printk("%02x ", c);
	124	}
	125	}
	126	printk("\n");
	127	}
	128
	129	void nommu_dump_state(struct pt_regs *regs,
	130	unsigned long ea, unsigned long vector)
	131	{
	132	int i;
	133	unsigned long addr, stack = regs->sp;
	134
	135	printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
	136
	137	printk("CPU #: %d\n"
	138	" PC: %08lx SR: %08lx SP: %08lx\n",
	139	0, regs->pc, regs->sr, regs->sp);
	140	printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
	141	0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
	142	printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
	143	regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
	144	printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
	145	regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
	146	printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
	147	regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
	148	printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
	149	regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
	150	printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
	151	regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
	152	printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
	153	regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
	154	printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
	155	regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
6cbe5e95 JB	156	printk(" RES: %08lx oGPR11: %08lx\n",
6cbe5e95 JB	157	regs->gpr[11], regs->orig_gpr11);
769a8a96 JB	158
	159	printk("Process %s (pid: %d, stackpage=%08lx)\n",
	160	((struct task_struct *)(__pa(current)))->comm,
	161	((struct task_struct *)(__pa(current)))->pid,
	162	(unsigned long)current);
	163
	164	printk("\nStack: ");
	165	printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
	166	for (i = 0; i < kstack_depth_to_print; i++) {
	167	if (((long)stack & (THREAD_SIZE - 1)) == 0)
	168	break;
	169	stack++;
	170
	171	printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
	172	((unsigned long )(__pa(stack))));
	173	}
	174	printk("\n");
	175
	176	printk("Call Trace: ");
	177	i = 1;
	178	while (((long)stack & (THREAD_SIZE - 1)) != 0) {
	179	addr = ((unsigned long )__pa(stack));
	180	stack++;
	181
	182	if (kernel_text_address(addr)) {
	183	if (i && ((i % 6) == 0))
	184	printk("\n ");
	185	printk(" [<%08lx>]", addr);
	186	i++;
	187	}
	188	}
	189	printk("\n");
	190
	191	printk("\nCode: ");
	192
	193	for (i = -24; i < 24; i++) {
	194	unsigned char c;
	195	c = ((unsigned char *)(__pa(regs->pc)))[i];
	196
	197	if (i == 0)
	198	printk("(%02x) ", c);
	199	else
	200	printk("%02x ", c);
	201	}
	202	printk("\n");
	203	}
	204
	205	/* This is normally the 'Oops' routine */
	206	void die(const char str, struct pt_regs regs, long err)
	207	{
	208
	209	console_verbose();
	210	printk("\n%s#: %04lx\n", str, err & 0xffff);
	211	show_registers(regs);
	212	#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
	213	printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
	214
	215	/* shut down interrupts */
	216	local_irq_disable();
	217
	218	__asm__ __volatile__("l.nop 1");
	219	do {} while (1);
	220	#endif
	221	do_exit(SIGSEGV);
222	}
223
224	/* This is normally the 'Oops' routine */
225	void die_if_kernel(const char str, struct pt_regs regs, long err)
226	{
227	if (user_mode(regs))
228	return;
229
230	die(str, regs, err);
231	}
232
233	void unhandled_exception(struct pt_regs *regs, int ea, int vector)
234	{
235	printk("Unable to handle exception at EA =0x%x, vector 0x%x",
236	ea, vector);
237	die("Oops", regs, 9);
238	}
239
240	void __init trap_init(void)
241	{
242	/* Nothing needs to be done */
243	}
244
245	asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
246	{
2e1661d2	247	force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
769a8a96 JB	248
	249	regs->pc += 4;
	250	}
	251
	252	asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
	253	{
769a8a96	254	if (user_mode(regs)) {
500d5830	255	/* Send a SIGBUS */
2e1661d2	256	force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
769a8a96 JB	257	} else {
	258	printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
	259	show_registers(regs);
	260	die("Die:", regs, address);
	261	}
	262
	263	}
	264
	265	asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
	266	{
769a8a96 JB	267	if (user_mode(regs)) {
769a8a96 JB	268	/* Send a SIGBUS */
2e1661d2	269	force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
769a8a96 JB	270	} else { /* Kernel mode */
	271	printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
	272	show_registers(regs);
	273	die("Die:", regs, address);
	274	}
	275	}
	276
63104c06 SK	277	static inline int in_delay_slot(struct pt_regs *regs)
	278	{
	279	#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
	280	/* No delay slot flag, do the old way */
	281	unsigned int op, insn;
	282
	283	insn = ((unsigned int )regs->pc);
	284	op = insn >> 26;
	285	switch (op) {
	286	case 0x00: /* l.j */
	287	case 0x01: /* l.jal */
	288	case 0x03: /* l.bnf */
	289	case 0x04: /* l.bf */
	290	case 0x11: /* l.jr */
	291	case 0x12: /* l.jalr */
	292	return 1;
	293	default:
	294	return 0;
	295	}
	296	#else
ae15a41a	297	return mfspr(SPR_SR) & SPR_SR_DSX;
63104c06 SK	298	#endif
	299	}
	300
	301	static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
	302	{
	303	int displacement;
	304	unsigned int rb, op, jmp;
	305
	306	if (unlikely(in_delay_slot(regs))) {
	307	/* In delay slot, instruction at pc is a branch, simulate it */
	308	jmp = ((unsigned int )regs->pc);
	309
	310	displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
	311	rb = (jmp & 0x0000ffff) >> 11;
	312	op = jmp >> 26;
	313
	314	switch (op) {
	315	case 0x00: /* l.j */
	316	regs->pc += displacement;
	317	return;
	318	case 0x01: /* l.jal */
	319	regs->pc += displacement;
	320	regs->gpr[9] = regs->pc + 8;
	321	return;
	322	case 0x03: /* l.bnf */
	323	if (regs->sr & SPR_SR_F)
	324	regs->pc += 8;
	325	else
	326	regs->pc += displacement;
	327	return;
	328	case 0x04: /* l.bf */
	329	if (regs->sr & SPR_SR_F)
	330	regs->pc += displacement;
	331	else
	332	regs->pc += 8;
	333	return;
	334	case 0x11: /* l.jr */
	335	regs->pc = regs->gpr[rb];
	336	return;
	337	case 0x12: /* l.jalr */
	338	regs->pc = regs->gpr[rb];
	339	regs->gpr[9] = regs->pc + 8;
	340	return;
	341	default:
	342	break;
	343	}
	344	} else {
	345	regs->pc += 4;
	346	}
	347	}
	348
	349	static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
	350	unsigned int insn)
	351	{
	352	unsigned int ra, rd;
	353	unsigned long value;
	354	unsigned long orig_pc;
	355	long imm;
	356
	357	const struct exception_table_entry *entry;
	358
	359	orig_pc = regs->pc;
	360	adjust_pc(regs, address);
	361
362	ra = (insn >> 16) & 0x1f;
363	rd = (insn >> 21) & 0x1f;
364	imm = (short)insn;
365	lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
366
367	if ((unsigned long)lwa_addr & 0x3) {
368	do_unaligned_access(regs, address);
369	return;
370	}
371
372	if (get_user(value, lwa_addr)) {
373	if (user_mode(regs)) {
3cf5d076	374	force_sig(SIGSEGV);
63104c06 SK	375	return;
	376	}
	377
	378	if ((entry = search_exception_tables(orig_pc))) {
	379	regs->pc = entry->fixup;
	380	return;
	381	}
	382
	383	/* kernel access in kernel space, load it directly */
	384	value = ((unsigned long )lwa_addr);
	385	}
	386
	387	lwa_flag = 1;
	388	regs->gpr[rd] = value;
	389	}
	390
	391	static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
	392	unsigned int insn)
	393	{
	394	unsigned long __user *vaddr;
	395	unsigned long orig_pc;
	396	unsigned int ra, rb;
	397	long imm;
	398
	399	const struct exception_table_entry *entry;
	400
	401	orig_pc = regs->pc;
	402	adjust_pc(regs, address);
	403
	404	ra = (insn >> 16) & 0x1f;
	405	rb = (insn >> 11) & 0x1f;
	406	imm = (short)(((insn & 0x2200000) >> 10) \| (insn & 0x7ff));
	407	vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
	408
	409	if (!lwa_flag \|\| vaddr != lwa_addr) {
	410	regs->sr &= ~SPR_SR_F;
	411	return;
	412	}
	413
	414	if ((unsigned long)vaddr & 0x3) {
	415	do_unaligned_access(regs, address);
	416	return;
	417	}
	418
	419	if (put_user(regs->gpr[rb], vaddr)) {
	420	if (user_mode(regs)) {
3cf5d076	421	force_sig(SIGSEGV);
63104c06 SK	422	return;
	423	}
	424
	425	if ((entry = search_exception_tables(orig_pc))) {
	426	regs->pc = entry->fixup;
	427	return;
	428	}
	429
	430	/* kernel access in kernel space, store it directly */
	431	((unsigned long )vaddr) = regs->gpr[rb];
	432	}
	433
	434	lwa_flag = 0;
	435	regs->sr \|= SPR_SR_F;
	436	}
	437
	438	#define INSN_LWA 0x1b
	439	#define INSN_SWA 0x33
	440
769a8a96 JB	441	asmlinkage void do_illegal_instruction(struct pt_regs *regs,
	442	unsigned long address)
	443	{
63104c06 SK	444	unsigned int op;
	445	unsigned int insn = ((unsigned int )address);
	446
	447	op = insn >> 26;
	448
	449	switch (op) {
	450	case INSN_LWA:
	451	simulate_lwa(regs, address, insn);
	452	return;
	453
	454	case INSN_SWA:
	455	simulate_swa(regs, address, insn);
	456	return;
	457
	458	default:
	459	break;
	460	}
769a8a96 JB	461
	462	if (user_mode(regs)) {
	463	/* Send a SIGILL */
2e1661d2	464	force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
769a8a96 JB	465	} else { /* Kernel mode */
	466	printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
	467	address);
	468	show_registers(regs);
	469	die("Die:", regs, address);
	470	}
	471	}