aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m32r/kernel/traps.c
blob: 89ba4a0b5d5109d0be4569947e13591d115a2f91 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
/*
 *  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/mm.h>
#include <asm/page.h>
#include <asm/processor.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/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);

/*
 * 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

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;
	eit_vector[190] = 0;
	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();
}

int kstack_depth_to_print = 24;

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>] ", addr);
			print_symbol("%s\n", 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);
}

void dump_stack(void)
{
	unsigned long stack;

	show_trace(current, &stack);
}

EXPORT_SYMBOL(dump_stack);

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");
}

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);
	}
}