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

/*
 * arch/score/kernel/traps.c
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <liqin.chen@sunplusct.com>
 *  Lennox Wu <lennox.wu@sunplusct.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/sched.h>

#include <asm/cacheflush.h>
#include <asm/irq.h>
#include <asm/irq_regs.h>

unsigned long exception_handlers[32];

/*
 * The architecture-independent show_stack generator
 */
void show_stack(struct task_struct *task, unsigned long *sp)
{
	int i;
	long stackdata;

	sp = sp ? sp : (unsigned long *)&sp;

	printk(KERN_NOTICE "Stack: ");
	i = 1;
	while ((long) sp & (PAGE_SIZE - 1)) {
		if (i && ((i % 8) == 0))
			printk(KERN_NOTICE "\n");
		if (i > 40) {
			printk(KERN_NOTICE " ...");
			break;
		}

		if (__get_user(stackdata, sp++)) {
			printk(KERN_NOTICE " (Bad stack address)");
			break;
		}

		printk(KERN_NOTICE " %08lx", stackdata);
		i++;
	}
	printk(KERN_NOTICE "\n");
}

static void show_trace(long *sp)
{
	int i;
	long addr;

	sp = sp ? sp : (long *) &sp;

	printk(KERN_NOTICE "Call Trace:  ");
	i = 1;
	while ((long) sp & (PAGE_SIZE - 1)) {
		if (__get_user(addr, sp++)) {
			if (i && ((i % 6) == 0))
				printk(KERN_NOTICE "\n");
			printk(KERN_NOTICE " (Bad stack address)\n");
			break;
		}

		if (kernel_text_address(addr)) {
			if (i && ((i % 6) == 0))
				printk(KERN_NOTICE "\n");
			if (i > 40) {
				printk(KERN_NOTICE " ...");
				break;
			}

			printk(KERN_NOTICE " [<%08lx>]", addr);
			i++;
		}
	}
	printk(KERN_NOTICE "\n");
}

static void show_code(unsigned int *pc)
{
	long i;

	printk(KERN_NOTICE "\nCode:");

	for (i = -3; i < 6; i++) {
		unsigned long insn;
		if (__get_user(insn, pc + i)) {
			printk(KERN_NOTICE " (Bad address in epc)\n");
			break;
		}
		printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
			insn, (i ? ' ' : '>'));
	}
}

/*
 * FIXME: really the generic show_regs should take a const pointer argument.
 */
void show_regs(struct pt_regs *regs)
{
	printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
		regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
		regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
	printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
		regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
		regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
	printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
		regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
		regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
	printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
		regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
		regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);

	printk("CEH : %08lx\n", regs->ceh);
	printk("CEL : %08lx\n", regs->cel);

	printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
		regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
		regs->cp0_ecr, regs->cp0_condition);
}

static void show_registers(struct pt_regs *regs)
{
	show_regs(regs);
	printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
		current->comm, current->pid, (unsigned long) current);
	show_stack(current_thread_info()->task, (long *) regs->regs[0]);
	show_trace((long *) regs->regs[0]);
	show_code((unsigned int *) regs->cp0_epc);
	printk(KERN_NOTICE "\n");
}

/*
 * The architecture-independent dump_stack generator
 */
void dump_stack(void)
{
	show_stack(current_thread_info()->task,
		   (long *) get_irq_regs()->regs[0]);
}
EXPORT_SYMBOL(dump_stack);

void __die(const char *str, struct pt_regs *regs, const char *file,
	const char *func, unsigned long line)
{
	console_verbose();
	printk("%s", str);
	if (file && func)
		printk(" in %s:%s, line %ld", file, func, line);
	printk(":\n");
	show_registers(regs);
	do_exit(SIGSEGV);
}

void __die_if_kernel(const char *str, struct pt_regs *regs,
		const char *file, const char *func, unsigned long line)
{
	if (!user_mode(regs))
		__die(str, regs, file, func, line);
}

asmlinkage void do_adelinsn(struct pt_regs *regs)
{
	printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
		 regs->cp0_ema, regs->cp0_epc);
	die_if_kernel("do_ade execution Exception\n", regs);
	force_sig(SIGBUS, current);
}

asmlinkage void do_adedata(struct pt_regs *regs)
{
	const struct exception_table_entry *fixup;
	fixup = search_exception_tables(regs->cp0_epc);
	if (fixup) {
		regs->cp0_epc = fixup->fixup;
		return;
	}
	printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
		 regs->cp0_ema, regs->cp0_epc);
	die_if_kernel("do_ade execution Exception\n", regs);
	force_sig(SIGBUS, current);
}

asmlinkage void do_pel(struct pt_regs *regs)
{
	die_if_kernel("do_pel execution Exception", regs);
	force_sig(SIGFPE, current);
}

asmlinkage void do_cee(struct pt_regs *regs)
{
	die_if_kernel("do_cee execution Exception", regs);
	force_sig(SIGFPE, current);
}

asmlinkage void do_cpe(struct pt_regs *regs)
{
	die_if_kernel("do_cpe execution Exception", regs);
	force_sig(SIGFPE, current);
}

asmlinkage void do_be(struct pt_regs *regs)
{
	die_if_kernel("do_be execution Exception", regs);
	force_sig(SIGBUS, current);
}

asmlinkage void do_ov(struct pt_regs *regs)
{
	siginfo_t info;

	die_if_kernel("do_ov execution Exception", regs);

	info.si_code = FPE_INTOVF;
	info.si_signo = SIGFPE;
	info.si_errno = 0;
	info.si_addr = (void *)regs->cp0_epc;
	force_sig_info(SIGFPE, &info, current);
}

asmlinkage void do_tr(struct pt_regs *regs)
{
	die_if_kernel("do_tr execution Exception", regs);
	force_sig(SIGTRAP, current);
}

asmlinkage void do_ri(struct pt_regs *regs)
{
	unsigned long epc_insn;
	unsigned long epc = regs->cp0_epc;

	read_tsk_long(current, epc, &epc_insn);
	if (current->thread.single_step == 1) {
		if ((epc == current->thread.addr1) ||
		    (epc == current->thread.addr2)) {
			user_disable_single_step(current);
			force_sig(SIGTRAP, current);
			return;
		} else
			BUG();
	} else if ((epc_insn == BREAKPOINT32_INSN) ||
		   ((epc_insn & 0x0000FFFF) == 0x7002) ||
		   ((epc_insn & 0xFFFF0000) == 0x70020000)) {
			force_sig(SIGTRAP, current);
			return;
	} else {
		die_if_kernel("do_ri execution Exception", regs);
		force_sig(SIGILL, current);
	}
}

asmlinkage void do_ccu(struct pt_regs *regs)
{
	die_if_kernel("do_ccu execution Exception", regs);
	force_sig(SIGILL, current);
}

asmlinkage void do_reserved(struct pt_regs *regs)
{
	/*
	 * Game over - no way to handle this if it ever occurs.  Most probably
	 * caused by a new unknown cpu type or after another deadly
	 * hard/software error.
	 */
	die_if_kernel("do_reserved execution Exception", regs);
	show_regs(regs);
	panic("Caught reserved exception - should not happen.");
}

/*
 * NMI exception handler.
 */
void nmi_exception_handler(struct pt_regs *regs)
{
	die_if_kernel("nmi_exception_handler execution Exception", regs);
	die("NMI", regs);
}

/* Install CPU exception handler */
void *set_except_vector(int n, void *addr)
{
	unsigned long handler = (unsigned long) addr;
	unsigned long old_handler = exception_handlers[n];

	exception_handlers[n] = handler;
	return (void *)old_handler;
}

void __init trap_init(void)
{
	int i;

	pgd_current = (unsigned long)init_mm.pgd;
	/* DEBUG EXCEPTION */
	memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
			&debug_exception_vector, DEBUG_VECTOR_SIZE);
	/* NMI EXCEPTION */
	memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
			&general_exception_vector, GENERAL_VECTOR_SIZE);

	/*
	 * Initialise exception handlers
	 */
	for (i = 0; i <= 31; i++)
		set_except_vector(i, handle_reserved);

	set_except_vector(1, handle_nmi);
	set_except_vector(2, handle_adelinsn);
	set_except_vector(3, handle_tlb_refill);
	set_except_vector(4, handle_tlb_invaild);
	set_except_vector(5, handle_ibe);
	set_except_vector(6, handle_pel);
	set_except_vector(7, handle_sys);
	set_except_vector(8, handle_ccu);
	set_except_vector(9, handle_ri);
	set_except_vector(10, handle_tr);
	set_except_vector(11, handle_adedata);
	set_except_vector(12, handle_adedata);
	set_except_vector(13, handle_tlb_refill);
	set_except_vector(14, handle_tlb_invaild);
	set_except_vector(15, handle_mod);
	set_except_vector(16, handle_cee);
	set_except_vector(17, handle_cpe);
	set_except_vector(18, handle_dbe);
	flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);

	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;
	cpu_cache_init();
}
Commit	Line	Data
6bc9a396 CL	1	/*
	2	* arch/score/kernel/traps.c
	3	*
	4	* Score Processor version.
	5	*
	6	* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
	7	* Chen Liqin <liqin.chen@sunplusct.com>
	8	* Lennox Wu <lennox.wu@sunplusct.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, see the file COPYING, or write
	22	* to the Free Software Foundation, Inc.,
	23	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/sched.h>
	28
	29	#include <asm/cacheflush.h>
	30	#include <asm/irq.h>
	31	#include <asm/irq_regs.h>
	32
	33	unsigned long exception_handlers[32];
	34
	35	/*
	36	* The architecture-independent show_stack generator
	37	*/
	38	void show_stack(struct task_struct task, unsigned long sp)
	39	{
	40	int i;
	41	long stackdata;
	42
	43	sp = sp ? sp : (unsigned long *)&sp;
	44
	45	printk(KERN_NOTICE "Stack: ");
	46	i = 1;
	47	while ((long) sp & (PAGE_SIZE - 1)) {
	48	if (i && ((i % 8) == 0))
	49	printk(KERN_NOTICE "\n");
	50	if (i > 40) {
	51	printk(KERN_NOTICE " ...");
	52	break;
	53	}
	54
	55	if (__get_user(stackdata, sp++)) {
	56	printk(KERN_NOTICE " (Bad stack address)");
	57	break;
	58	}
	59
	60	printk(KERN_NOTICE " %08lx", stackdata);
	61	i++;
	62	}
	63	printk(KERN_NOTICE "\n");
	64	}
65
66	static void show_trace(long *sp)
67	{
68	int i;
69	long addr;
70
71	sp = sp ? sp : (long *) &sp;
72
73	printk(KERN_NOTICE "Call Trace: ");
74	i = 1;
75	while ((long) sp & (PAGE_SIZE - 1)) {
76	if (__get_user(addr, sp++)) {
77	if (i && ((i % 6) == 0))
78	printk(KERN_NOTICE "\n");
79	printk(KERN_NOTICE " (Bad stack address)\n");
80	break;
81	}
82
83	if (kernel_text_address(addr)) {
84	if (i && ((i % 6) == 0))
85	printk(KERN_NOTICE "\n");
86	if (i > 40) {
87	printk(KERN_NOTICE " ...");
88	break;
89	}
90
91	printk(KERN_NOTICE " [<%08lx>]", addr);
92	i++;
93	}
94	}
95	printk(KERN_NOTICE "\n");
96	}
97
98	static void show_code(unsigned int *pc)
99	{
100	long i;
101
102	printk(KERN_NOTICE "\nCode:");
103
104	for (i = -3; i < 6; i++) {
105	unsigned long insn;
106	if (__get_user(insn, pc + i)) {
107	printk(KERN_NOTICE " (Bad address in epc)\n");
108	break;
109	}
110	printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
111	insn, (i ? ' ' : '>'));
112	}
113	}
114
115	/*
116	* FIXME: really the generic show_regs should take a const pointer argument.
117	*/
118	void show_regs(struct pt_regs *regs)
119	{
120	printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
121	regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
122	regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
123	printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
124	regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
125	regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
126	printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
127	regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
128	regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
129	printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
130	regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
131	regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
132
133	printk("CEH : %08lx\n", regs->ceh);
134	printk("CEL : %08lx\n", regs->cel);
135
136	printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
137	regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
138	regs->cp0_ecr, regs->cp0_condition);
139	}
140
141	static void show_registers(struct pt_regs *regs)
142	{
143	show_regs(regs);
144	printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
145	current->comm, current->pid, (unsigned long) current);
146	show_stack(current_thread_info()->task, (long *) regs->regs[0]);
147	show_trace((long *) regs->regs[0]);
148	show_code((unsigned int *) regs->cp0_epc);
149	printk(KERN_NOTICE "\n");
150	}
151
152	/*
153	* The architecture-independent dump_stack generator
154	*/
155	void dump_stack(void)
156	{
157	show_stack(current_thread_info()->task,
158	(long *) get_irq_regs()->regs[0]);
159	}
160	EXPORT_SYMBOL(dump_stack);
161
162	void __die(const char str, struct pt_regs regs, const char *file,
163	const char *func, unsigned long line)
164	{
165	console_verbose();
166	printk("%s", str);
167	if (file && func)
168	printk(" in %s:%s, line %ld", file, func, line);
169	printk(":\n");
170	show_registers(regs);
171	do_exit(SIGSEGV);
172	}
173
174	void __die_if_kernel(const char str, struct pt_regs regs,
175	const char file, const char func, unsigned long line)
176	{
177	if (!user_mode(regs))
178	__die(str, regs, file, func, line);
179	}
180
181	asmlinkage void do_adelinsn(struct pt_regs *regs)
182	{
183	printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
184	regs->cp0_ema, regs->cp0_epc);
185	die_if_kernel("do_ade execution Exception\n", regs);
186	force_sig(SIGBUS, current);
187	}
188
189	asmlinkage void do_adedata(struct pt_regs *regs)
190	{
191	const struct exception_table_entry *fixup;
192	fixup = search_exception_tables(regs->cp0_epc);
193	if (fixup) {
194	regs->cp0_epc = fixup->fixup;
195	return;
196	}
197	printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
198	regs->cp0_ema, regs->cp0_epc);
199	die_if_kernel("do_ade execution Exception\n", regs);
200	force_sig(SIGBUS, current);
201	}
202
203	asmlinkage void do_pel(struct pt_regs *regs)
204	{
205	die_if_kernel("do_pel execution Exception", regs);
206	force_sig(SIGFPE, current);
207	}
208
209	asmlinkage void do_cee(struct pt_regs *regs)
210	{
211	die_if_kernel("do_cee execution Exception", regs);
212	force_sig(SIGFPE, current);
213	}
214
215	asmlinkage void do_cpe(struct pt_regs *regs)
216	{
217	die_if_kernel("do_cpe execution Exception", regs);
218	force_sig(SIGFPE, current);
219	}
220
221	asmlinkage void do_be(struct pt_regs *regs)
222	{
223	die_if_kernel("do_be execution Exception", regs);
224	force_sig(SIGBUS, current);
225	}
226
227	asmlinkage void do_ov(struct pt_regs *regs)
228	{
229	siginfo_t info;
230
231	die_if_kernel("do_ov execution Exception", regs);
232
233	info.si_code = FPE_INTOVF;
234	info.si_signo = SIGFPE;
235	info.si_errno = 0;
236	info.si_addr = (void *)regs->cp0_epc;
237	force_sig_info(SIGFPE, &info, current);
238	}
239
240	asmlinkage void do_tr(struct pt_regs *regs)
241	{
242	die_if_kernel("do_tr execution Exception", regs);
243	force_sig(SIGTRAP, current);
244	}
245
246	asmlinkage void do_ri(struct pt_regs *regs)
247	{
248	unsigned long epc_insn;
249	unsigned long epc = regs->cp0_epc;
250
251	read_tsk_long(current, epc, &epc_insn);
252	if (current->thread.single_step == 1) {
253	if ((epc == current->thread.addr1) \|\|
254	(epc == current->thread.addr2)) {
0402c91a	255	user_disable_single_step(current);
6bc9a396 CL	256	force_sig(SIGTRAP, current);
	257	return;
	258	} else
	259	BUG();
	260	} else if ((epc_insn == BREAKPOINT32_INSN) \|\|
	261	((epc_insn & 0x0000FFFF) == 0x7002) \|\|
	262	((epc_insn & 0xFFFF0000) == 0x70020000)) {
	263	force_sig(SIGTRAP, current);
	264	return;
	265	} else {
	266	die_if_kernel("do_ri execution Exception", regs);
	267	force_sig(SIGILL, current);
	268	}
	269	}
	270
	271	asmlinkage void do_ccu(struct pt_regs *regs)
	272	{
	273	die_if_kernel("do_ccu execution Exception", regs);
	274	force_sig(SIGILL, current);
	275	}
	276
	277	asmlinkage void do_reserved(struct pt_regs *regs)
	278	{
	279	/*
	280	* Game over - no way to handle this if it ever occurs. Most probably
	281	* caused by a new unknown cpu type or after another deadly
	282	* hard/software error.
	283	*/
	284	die_if_kernel("do_reserved execution Exception", regs);
	285	show_regs(regs);
	286	panic("Caught reserved exception - should not happen.");
	287	}
	288
	289	/*
	290	* NMI exception handler.
	291	*/
	292	void nmi_exception_handler(struct pt_regs *regs)
	293	{
	294	die_if_kernel("nmi_exception_handler execution Exception", regs);
	295	die("NMI", regs);
	296	}
	297
	298	/* Install CPU exception handler */
	299	void set_except_vector(int n, void addr)
	300	{
	301	unsigned long handler = (unsigned long) addr;
	302	unsigned long old_handler = exception_handlers[n];
	303
	304	exception_handlers[n] = handler;
	305	return (void *)old_handler;
	306	}
	307
	308	void __init trap_init(void)
	309	{
	310	int i;
	311
	312	pgd_current = (unsigned long)init_mm.pgd;
	313	/* DEBUG EXCEPTION */
	314	memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
	315	&debug_exception_vector, DEBUG_VECTOR_SIZE);
	316	/* NMI EXCEPTION */
	317	memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
	318	&general_exception_vector, GENERAL_VECTOR_SIZE);
	319
320	/*
321	* Initialise exception handlers
322	*/
323	for (i = 0; i <= 31; i++)
324	set_except_vector(i, handle_reserved);
325
326	set_except_vector(1, handle_nmi);
327	set_except_vector(2, handle_adelinsn);
328	set_except_vector(3, handle_tlb_refill);
329	set_except_vector(4, handle_tlb_invaild);
330	set_except_vector(5, handle_ibe);
331	set_except_vector(6, handle_pel);
332	set_except_vector(7, handle_sys);
333	set_except_vector(8, handle_ccu);
334	set_except_vector(9, handle_ri);
335	set_except_vector(10, handle_tr);
336	set_except_vector(11, handle_adedata);
337	set_except_vector(12, handle_adedata);
338	set_except_vector(13, handle_tlb_refill);
339	set_except_vector(14, handle_tlb_invaild);
340	set_except_vector(15, handle_mod);
341	set_except_vector(16, handle_cee);
342	set_except_vector(17, handle_cpe);
343	set_except_vector(18, handle_dbe);
344	flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);
345
346	atomic_inc(&init_mm.mm_count);
347	current->active_mm = &init_mm;
348	cpu_cache_init();
349	}