[mirror_ubuntu-artful-kernel.git] / arch / m32r / kernel / traps.c

/*
 *  linux/arch/m32r/kernel/traps.c
 *
 *  Copyright (C) 2001, 2002  Hirokazu Takata, Hiroyuki Kondo,
 *                            Hitoshi Yamamoto
 */

/*
 * 'traps.c' handles hardware traps and faults after we have saved some
 * state in 'entry.S'.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kallsyms.h>
#include <linux/stddef.h>
#include <linux/ptrace.h>
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
#include <linux/mm.h>
#include <linux/cpu.h>

#include <asm/page.h>
#include <asm/processor.h>

#include <linux/uaccess.h>
#include <asm/io.h>
#include <linux/atomic.h>

#include <asm/smp.h>

#include <linux/module.h>

asmlinkage void alignment_check(void);
asmlinkage void ei_handler(void);
asmlinkage void rie_handler(void);
asmlinkage void debug_trap(void);
asmlinkage void cache_flushing_handler(void);
asmlinkage void ill_trap(void);

#ifdef CONFIG_SMP
extern void smp_reschedule_interrupt(void);
extern void smp_invalidate_interrupt(void);
extern void smp_call_function_interrupt(void);
extern void smp_ipi_timer_interrupt(void);
extern void smp_flush_cache_all_interrupt(void);
extern void smp_call_function_single_interrupt(void);

/*
 * for Boot AP function
 */
asm (
	"	.section .eit_vector4,\"ax\"	\n"
	"	.global _AP_RE			\n"
	"	.global startup_AP		\n"
	"_AP_RE:				\n"
	"	.fill 32, 4, 0			\n"
	"_AP_EI: bra	startup_AP		\n"
	"	.previous			\n"
);
#endif  /* CONFIG_SMP */

extern unsigned long	eit_vector[];
#define BRA_INSN(func, entry)	\
	((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
	+ 0xff000000UL

static void set_eit_vector_entries(void)
{
	extern void default_eit_handler(void);
	extern void system_call(void);
	extern void pie_handler(void);
	extern void ace_handler(void);
	extern void tme_handler(void);
	extern void _flush_cache_copyback_all(void);

	eit_vector[0] = 0xd0c00001; /* seth r0, 0x01 */
	eit_vector[1] = BRA_INSN(default_eit_handler, 1);
	eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
	eit_vector[5] = BRA_INSN(default_eit_handler, 5);
	eit_vector[8] = BRA_INSN(rie_handler, 8);
	eit_vector[12] = BRA_INSN(alignment_check, 12);
	eit_vector[16] = BRA_INSN(ill_trap, 16);
	eit_vector[17] = BRA_INSN(debug_trap, 17);
	eit_vector[18] = BRA_INSN(system_call, 18);
	eit_vector[19] = BRA_INSN(ill_trap, 19);
	eit_vector[20] = BRA_INSN(ill_trap, 20);
	eit_vector[21] = BRA_INSN(ill_trap, 21);
	eit_vector[22] = BRA_INSN(ill_trap, 22);
	eit_vector[23] = BRA_INSN(ill_trap, 23);
	eit_vector[24] = BRA_INSN(ill_trap, 24);
	eit_vector[25] = BRA_INSN(ill_trap, 25);
	eit_vector[26] = BRA_INSN(ill_trap, 26);
	eit_vector[27] = BRA_INSN(ill_trap, 27);
	eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
	eit_vector[29] = BRA_INSN(ill_trap, 29);
	eit_vector[30] = BRA_INSN(ill_trap, 30);
	eit_vector[31] = BRA_INSN(ill_trap, 31);
	eit_vector[32] = BRA_INSN(ei_handler, 32);
	eit_vector[64] = BRA_INSN(pie_handler, 64);
#ifdef CONFIG_MMU
	eit_vector[68] = BRA_INSN(ace_handler, 68);
	eit_vector[72] = BRA_INSN(tme_handler, 72);
#endif /* CONFIG_MMU */
#ifdef CONFIG_SMP
	eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
	eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
	eit_vector[186] = (unsigned long)smp_call_function_interrupt;
	eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
	eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
	eit_vector[189] = 0;	/* CPU_BOOT_IPI */
	eit_vector[190] = (unsigned long)smp_call_function_single_interrupt;
	eit_vector[191] = 0;
#endif
	_flush_cache_copyback_all();
}

void __init trap_init(void)
{
	set_eit_vector_entries();

	/*
	 * Should be a barrier for any external CPU state.
	 */
	cpu_init();
}

static int kstack_depth_to_print = 24;

static void show_trace(struct task_struct *task, unsigned long *stack)
{
	unsigned long addr;

	if (!stack)
		stack = (unsigned long*)&stack;

	printk("Call Trace: ");
	while (!kstack_end(stack)) {
		addr = *stack++;
		if (__kernel_text_address(addr))
			printk("[<%08lx>] %pSR\n", addr, (void *)addr);
	}
	printk("\n");
}

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

	/*
	 * debugging aid: "show_stack(NULL);" prints the
	 * back trace for this cpu.
	 */

	if(sp==NULL) {
		if (task)
			sp = (unsigned long *)task->thread.sp;
		else
			sp=(unsigned long*)&sp;
	}

	stack = sp;
	for(i=0; i < kstack_depth_to_print; i++) {
		if (kstack_end(stack))
			break;
		if (i && ((i % 4) == 0))
			printk("\n       ");
		printk("%08lx ", *stack++);
	}
	printk("\n");
	show_trace(task, sp);
}

static void show_registers(struct pt_regs *regs)
{
	int i = 0;
	int in_kernel = 1;
	unsigned long sp;

	printk("CPU:    %d\n", smp_processor_id());
	show_regs(regs);

	sp = (unsigned long) (1+regs);
	if (user_mode(regs)) {
		in_kernel = 0;
		sp = regs->spu;
		printk("SPU: %08lx\n", sp);
	} else {
		printk("SPI: %08lx\n", sp);
	}
	printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
		current->comm, task_pid_nr(current), 0xffff & i, 4096+(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(current, (unsigned long*) sp);

		printk("\nCode: ");
		if (regs->bpc < PAGE_OFFSET)
			goto bad;

		for(i=0;i<20;i++) {
			unsigned char c;
			if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
bad:
				printk(" Bad PC value.");
				break;
			}
			printk("%02x ", c);
		}
	}
	printk("\n");
}

static DEFINE_SPINLOCK(die_lock);

void die(const char * str, struct pt_regs * regs, long err)
{
	console_verbose();
	spin_lock_irq(&die_lock);
	bust_spinlocks(1);
	printk("%s: %04lx\n", str, err & 0xffff);
	show_registers(regs);
	bust_spinlocks(0);
	spin_unlock_irq(&die_lock);
	do_exit(SIGSEGV);
}

static __inline__ void die_if_kernel(const char * str,
	struct pt_regs * regs, long err)
{
	if (!user_mode(regs))
		die(str, regs, err);
}

static __inline__ void do_trap(int trapnr, int signr, const char * str,
	struct pt_regs * regs, long error_code, siginfo_t *info)
{
	if (user_mode(regs)) {
		/* trap_signal */
		struct task_struct *tsk = current;
		tsk->thread.error_code = error_code;
		tsk->thread.trap_no = trapnr;
		if (info)
			force_sig_info(signr, info, tsk);
		else
			force_sig(signr, tsk);
		return;
	} else {
		/* kernel_trap */
		if (!fixup_exception(regs))
			die(str, regs, error_code);
		return;
	}
}

#define DO_ERROR(trapnr, signr, str, name) \
asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
{ \
	do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
}

#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
{ \
	siginfo_t info; \
	info.si_signo = signr; \
	info.si_errno = 0; \
	info.si_code = sicode; \
	info.si_addr = (void __user *)siaddr; \
	do_trap(trapnr, signr, str, regs, error_code, &info); \
}

DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
DO_ERROR_INFO(0x20, SIGILL,  "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
DO_ERROR_INFO(0x100, SIGILL,  "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
DO_ERROR_INFO(-1, SIGILL,  "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)

extern int handle_unaligned_access(unsigned long, struct pt_regs *);

/* This code taken from arch/sh/kernel/traps.c */
asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
{
	mm_segment_t oldfs;
	unsigned long insn;
	int tmp;

	oldfs = get_fs();

	if (user_mode(regs)) {
		local_irq_enable();
		current->thread.error_code = error_code;
		current->thread.trap_no = 0x17;

		set_fs(USER_DS);
		if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
			set_fs(oldfs);
			goto uspace_segv;
		}
		tmp = handle_unaligned_access(insn, regs);
		set_fs(oldfs);

		if (!tmp)
			return;

	uspace_segv:
		printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
			"access\n", current->comm);
		force_sig(SIGSEGV, current);
	} else {
		set_fs(KERNEL_DS);
		if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
			set_fs(oldfs);
			die("insn faulting in do_address_error", regs, 0);
		}
		handle_unaligned_access(insn, regs);
		set_fs(oldfs);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m32r/kernel/traps.c
	3	*
	4	* Copyright (C) 2001, 2002 Hirokazu Takata, Hiroyuki Kondo,
	5	* Hitoshi Yamamoto
	6	*/
	7
1da177e4 LT	8	/*
	9	* 'traps.c' handles hardware traps and faults after we have saved some
	10	* state in 'entry.S'.
	11	*/
1da177e4 LT	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/kallsyms.h>
	15	#include <linux/stddef.h>
	16	#include <linux/ptrace.h>
b17b0153	17	#include <linux/sched/debug.h>
3f8c2452	18	#include <linux/sched/task_stack.h>
1da177e4	19	#include <linux/mm.h>
1777e463	20	#include <linux/cpu.h>
3f8c2452	21
1da177e4 LT	22	#include <asm/page.h>
	23	#include <asm/processor.h>
	24
7c0f6ba6	25	#include <linux/uaccess.h>
1da177e4	26	#include <asm/io.h>
60063497	27	#include <linux/atomic.h>
1da177e4 LT	28
	29	#include <asm/smp.h>
	30
	31	#include <linux/module.h>
	32
	33	asmlinkage void alignment_check(void);
	34	asmlinkage void ei_handler(void);
	35	asmlinkage void rie_handler(void);
	36	asmlinkage void debug_trap(void);
	37	asmlinkage void cache_flushing_handler(void);
9de11aab	38	asmlinkage void ill_trap(void);
1da177e4 LT	39
	40	#ifdef CONFIG_SMP
	41	extern void smp_reschedule_interrupt(void);
	42	extern void smp_invalidate_interrupt(void);
	43	extern void smp_call_function_interrupt(void);
	44	extern void smp_ipi_timer_interrupt(void);
	45	extern void smp_flush_cache_all_interrupt(void);
7b7426c8	46	extern void smp_call_function_single_interrupt(void);
1da177e4 LT	47
	48	/*
	49	* for Boot AP function
	50	*/
	51	asm (
	52	" .section .eit_vector4,\"ax\" \n"
	53	" .global _AP_RE \n"
	54	" .global startup_AP \n"
	55	"_AP_RE: \n"
	56	" .fill 32, 4, 0 \n"
	57	"_AP_EI: bra startup_AP \n"
	58	" .previous \n"
	59	);
	60	#endif /* CONFIG_SMP */
	61
	62	extern unsigned long eit_vector[];
	63	#define BRA_INSN(func, entry) \
	64	((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
	65	+ 0xff000000UL
	66
81e48073	67	static void set_eit_vector_entries(void)
1da177e4 LT	68	{
	69	extern void default_eit_handler(void);
	70	extern void system_call(void);
	71	extern void pie_handler(void);
	72	extern void ace_handler(void);
	73	extern void tme_handler(void);
	74	extern void _flush_cache_copyback_all(void);
	75
	76	eit_vector[0] = 0xd0c00001; /* seth r0, 0x01 */
	77	eit_vector[1] = BRA_INSN(default_eit_handler, 1);
	78	eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
	79	eit_vector[5] = BRA_INSN(default_eit_handler, 5);
	80	eit_vector[8] = BRA_INSN(rie_handler, 8);
	81	eit_vector[12] = BRA_INSN(alignment_check, 12);
9de11aab	82	eit_vector[16] = BRA_INSN(ill_trap, 16);
1da177e4 LT	83	eit_vector[17] = BRA_INSN(debug_trap, 17);
1da177e4 LT	84	eit_vector[18] = BRA_INSN(system_call, 18);
9de11aab HT	85	eit_vector[19] = BRA_INSN(ill_trap, 19);
	86	eit_vector[20] = BRA_INSN(ill_trap, 20);
	87	eit_vector[21] = BRA_INSN(ill_trap, 21);
	88	eit_vector[22] = BRA_INSN(ill_trap, 22);
	89	eit_vector[23] = BRA_INSN(ill_trap, 23);
	90	eit_vector[24] = BRA_INSN(ill_trap, 24);
	91	eit_vector[25] = BRA_INSN(ill_trap, 25);
	92	eit_vector[26] = BRA_INSN(ill_trap, 26);
	93	eit_vector[27] = BRA_INSN(ill_trap, 27);
1da177e4	94	eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
9de11aab HT	95	eit_vector[29] = BRA_INSN(ill_trap, 29);
	96	eit_vector[30] = BRA_INSN(ill_trap, 30);
	97	eit_vector[31] = BRA_INSN(ill_trap, 31);
1da177e4 LT	98	eit_vector[32] = BRA_INSN(ei_handler, 32);
	99	eit_vector[64] = BRA_INSN(pie_handler, 64);
	100	#ifdef CONFIG_MMU
	101	eit_vector[68] = BRA_INSN(ace_handler, 68);
	102	eit_vector[72] = BRA_INSN(tme_handler, 72);
	103	#endif /* CONFIG_MMU */
	104	#ifdef CONFIG_SMP
	105	eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
	106	eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
	107	eit_vector[186] = (unsigned long)smp_call_function_interrupt;
	108	eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
	109	eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
0a3d31b7 TH	110	eit_vector[189] = 0; /* CPU_BOOT_IPI */
0a3d31b7 TH	111	eit_vector[190] = (unsigned long)smp_call_function_single_interrupt;
1da177e4 LT	112	eit_vector[191] = 0;
	113	#endif
	114	_flush_cache_copyback_all();
	115	}
	116
	117	void __init trap_init(void)
	118	{
	119	set_eit_vector_entries();
	120
	121	/*
	122	* Should be a barrier for any external CPU state.
	123	*/
	124	cpu_init();
	125	}
	126
81e48073	127	static int kstack_depth_to_print = 24;
1da177e4	128
81e48073	129	static void show_trace(struct task_struct task, unsigned long stack)
1da177e4 LT	130	{
	131	unsigned long addr;
	132
	133	if (!stack)
	134	stack = (unsigned long*)&stack;
	135
	136	printk("Call Trace: ");
	137	while (!kstack_end(stack)) {
	138	addr = *stack++;
c8d5cb74 JP	139	if (__kernel_text_address(addr))
c8d5cb74 JP	140	printk("[<%08lx>] %pSR\n", addr, (void *)addr);
1da177e4 LT	141	}
	142	printk("\n");
	143	}
	144
	145	void show_stack(struct task_struct task, unsigned long sp)
	146	{
	147	unsigned long *stack;
	148	int i;
	149
	150	/*
	151	* debugging aid: "show_stack(NULL);" prints the
	152	* back trace for this cpu.
	153	*/
	154
	155	if(sp==NULL) {
	156	if (task)
	157	sp = (unsigned long *)task->thread.sp;
	158	else
	159	sp=(unsigned long*)&sp;
	160	}
	161
	162	stack = sp;
	163	for(i=0; i < kstack_depth_to_print; i++) {
	164	if (kstack_end(stack))
	165	break;
	166	if (i && ((i % 4) == 0))
	167	printk("\n ");
	168	printk("%08lx ", *stack++);
	169	}
	170	printk("\n");
	171	show_trace(task, sp);
	172	}
	173
1da177e4 LT	174	static void show_registers(struct pt_regs *regs)
	175	{
	176	int i = 0;
	177	int in_kernel = 1;
	178	unsigned long sp;
	179
	180	printk("CPU: %d\n", smp_processor_id());
	181	show_regs(regs);
	182
	183	sp = (unsigned long) (1+regs);
	184	if (user_mode(regs)) {
	185	in_kernel = 0;
	186	sp = regs->spu;
	187	printk("SPU: %08lx\n", sp);
	188	} else {
	189	printk("SPI: %08lx\n", sp);
	190	}
	191	printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
19c5870c	192	current->comm, task_pid_nr(current), 0xffff & i, 4096+(unsigned long)current);
1da177e4 LT	193
	194	/*
	195	* When in-kernel, we also print out the stack and code at the
	196	* time of the fault..
	197	*/
	198	if (in_kernel) {
	199	printk("\nStack: ");
	200	show_stack(current, (unsigned long*) sp);
	201
	202	printk("\nCode: ");
	203	if (regs->bpc < PAGE_OFFSET)
	204	goto bad;
	205
	206	for(i=0;i<20;i++) {
	207	unsigned char c;
	208	if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
	209	bad:
	210	printk(" Bad PC value.");
	211	break;
	212	}
	213	printk("%02x ", c);
	214	}
	215	}
	216	printk("\n");
	217	}
	218
81e48073	219	static DEFINE_SPINLOCK(die_lock);
1da177e4 LT	220
	221	void die(const char * str, struct pt_regs * regs, long err)
	222	{
	223	console_verbose();
	224	spin_lock_irq(&die_lock);
	225	bust_spinlocks(1);
	226	printk("%s: %04lx\n", str, err & 0xffff);
	227	show_registers(regs);
	228	bust_spinlocks(0);
	229	spin_unlock_irq(&die_lock);
	230	do_exit(SIGSEGV);
	231	}
	232
	233	static __inline__ void die_if_kernel(const char * str,
	234	struct pt_regs * regs, long err)
	235	{
	236	if (!user_mode(regs))
	237	die(str, regs, err);
	238	}
	239
	240	static __inline__ void do_trap(int trapnr, int signr, const char * str,
	241	struct pt_regs * regs, long error_code, siginfo_t *info)
	242	{
	243	if (user_mode(regs)) {
	244	/* trap_signal */
	245	struct task_struct *tsk = current;
	246	tsk->thread.error_code = error_code;
	247	tsk->thread.trap_no = trapnr;
	248	if (info)
	249	force_sig_info(signr, info, tsk);
	250	else
	251	force_sig(signr, tsk);
	252	return;
	253	} else {
	254	/* kernel_trap */
	255	if (!fixup_exception(regs))
	256	die(str, regs, error_code);
	257	return;
	258	}
	259	}
	260
	261	#define DO_ERROR(trapnr, signr, str, name) \
	262	asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
	263	{ \
12ea59e8	264	do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
1da177e4 LT	265	}
	266
	267	#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
	268	asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
	269	{ \
	270	siginfo_t info; \
	271	info.si_signo = signr; \
	272	info.si_errno = 0; \
	273	info.si_code = sicode; \
	274	info.si_addr = (void __user *)siaddr; \
	275	do_trap(trapnr, signr, str, regs, error_code, &info); \
	276	}
	277
	278	DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
	279	DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
9de11aab HT	280	DO_ERROR_INFO(0x100, SIGILL, "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
9de11aab HT	281	DO_ERROR_INFO(-1, SIGILL, "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
1da177e4 LT	282
	283	extern int handle_unaligned_access(unsigned long, struct pt_regs *);
	284
	285	/* This code taken from arch/sh/kernel/traps.c */
	286	asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
	287	{
	288	mm_segment_t oldfs;
	289	unsigned long insn;
	290	int tmp;
	291
	292	oldfs = get_fs();
	293
	294	if (user_mode(regs)) {
	295	local_irq_enable();
	296	current->thread.error_code = error_code;
	297	current->thread.trap_no = 0x17;
	298
	299	set_fs(USER_DS);
	300	if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
	301	set_fs(oldfs);
	302	goto uspace_segv;
	303	}
	304	tmp = handle_unaligned_access(insn, regs);
	305	set_fs(oldfs);
	306
	307	if (!tmp)
	308	return;
	309
	310	uspace_segv:
	311	printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
	312	"access\n", current->comm);
	313	force_sig(SIGSEGV, current);
	314	} else {
	315	set_fs(KERNEL_DS);
	316	if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
	317	set_fs(oldfs);
	318	die("insn faulting in do_address_error", regs, 0);
	319	}
	320	handle_unaligned_access(insn, regs);
	321	set_fs(oldfs);
	322	}
	323	}