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-rw-r--r--arch/m32r/kernel/traps.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/arch/m32r/kernel/traps.c b/arch/m32r/kernel/traps.c
new file mode 100644
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+++ b/arch/m32r/kernel/traps.c
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1/*
2 * linux/arch/m32r/kernel/traps.c
3 *
4 * Copyright (C) 2001, 2002 Hirokazu Takata, Hiroyuki Kondo,
5 * Hitoshi Yamamoto
6 */
7
8/* $Id$ */
9
10/*
11 * 'traps.c' handles hardware traps and faults after we have saved some
12 * state in 'entry.S'.
13 */
14#include <linux/config.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/kallsyms.h>
18#include <linux/stddef.h>
19#include <linux/ptrace.h>
20#include <linux/mm.h>
21#include <asm/page.h>
22#include <asm/processor.h>
23
24#include <asm/system.h>
25#include <asm/uaccess.h>
26#include <asm/io.h>
27#include <asm/atomic.h>
28
29#include <asm/smp.h>
30
31#include <linux/module.h>
32
33asmlinkage void alignment_check(void);
34asmlinkage void ei_handler(void);
35asmlinkage void rie_handler(void);
36asmlinkage void debug_trap(void);
37asmlinkage void cache_flushing_handler(void);
38
39#ifdef CONFIG_SMP
40extern void smp_reschedule_interrupt(void);
41extern void smp_invalidate_interrupt(void);
42extern void smp_call_function_interrupt(void);
43extern void smp_ipi_timer_interrupt(void);
44extern void smp_flush_cache_all_interrupt(void);
45
46/*
47 * for Boot AP function
48 */
49asm (
50 " .section .eit_vector4,\"ax\" \n"
51 " .global _AP_RE \n"
52 " .global startup_AP \n"
53 "_AP_RE: \n"
54 " .fill 32, 4, 0 \n"
55 "_AP_EI: bra startup_AP \n"
56 " .previous \n"
57);
58#endif /* CONFIG_SMP */
59
60extern unsigned long eit_vector[];
61#define BRA_INSN(func, entry) \
62 ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
63 + 0xff000000UL
64
65void set_eit_vector_entries(void)
66{
67 extern void default_eit_handler(void);
68 extern void system_call(void);
69 extern void pie_handler(void);
70 extern void ace_handler(void);
71 extern void tme_handler(void);
72 extern void _flush_cache_copyback_all(void);
73
74 eit_vector[0] = 0xd0c00001; /* seth r0, 0x01 */
75 eit_vector[1] = BRA_INSN(default_eit_handler, 1);
76 eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
77 eit_vector[5] = BRA_INSN(default_eit_handler, 5);
78 eit_vector[8] = BRA_INSN(rie_handler, 8);
79 eit_vector[12] = BRA_INSN(alignment_check, 12);
80 eit_vector[16] = 0xff000000UL;
81 eit_vector[17] = BRA_INSN(debug_trap, 17);
82 eit_vector[18] = BRA_INSN(system_call, 18);
83 eit_vector[19] = 0xff000000UL;
84 eit_vector[20] = 0xff000000UL;
85 eit_vector[21] = 0xff000000UL;
86 eit_vector[22] = 0xff000000UL;
87 eit_vector[23] = 0xff000000UL;
88 eit_vector[24] = 0xff000000UL;
89 eit_vector[25] = 0xff000000UL;
90 eit_vector[26] = 0xff000000UL;
91 eit_vector[27] = 0xff000000UL;
92 eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
93 eit_vector[29] = 0xff000000UL;
94 eit_vector[30] = 0xff000000UL;
95 eit_vector[31] = 0xff000000UL;
96 eit_vector[32] = BRA_INSN(ei_handler, 32);
97 eit_vector[64] = BRA_INSN(pie_handler, 64);
98#ifdef CONFIG_MMU
99 eit_vector[68] = BRA_INSN(ace_handler, 68);
100 eit_vector[72] = BRA_INSN(tme_handler, 72);
101#endif /* CONFIG_MMU */
102#ifdef CONFIG_SMP
103 eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
104 eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
105 eit_vector[186] = (unsigned long)smp_call_function_interrupt;
106 eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
107 eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
108 eit_vector[189] = 0;
109 eit_vector[190] = 0;
110 eit_vector[191] = 0;
111#endif
112 _flush_cache_copyback_all();
113}
114
115void __init trap_init(void)
116{
117 set_eit_vector_entries();
118
119 /*
120 * Should be a barrier for any external CPU state.
121 */
122 cpu_init();
123}
124
125int kstack_depth_to_print = 24;
126
127void show_trace(struct task_struct *task, unsigned long *stack)
128{
129 unsigned long addr;
130
131 if (!stack)
132 stack = (unsigned long*)&stack;
133
134 printk("Call Trace: ");
135 while (!kstack_end(stack)) {
136 addr = *stack++;
137 if (__kernel_text_address(addr)) {
138 printk("[<%08lx>] ", addr);
139 print_symbol("%s\n", addr);
140 }
141 }
142 printk("\n");
143}
144
145void 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
174void dump_stack(void)
175{
176 unsigned long stack;
177
178 show_trace(current, &stack);
179}
180
181EXPORT_SYMBOL(dump_stack);
182
183static void show_registers(struct pt_regs *regs)
184{
185 int i = 0;
186 int in_kernel = 1;
187 unsigned long sp;
188
189 printk("CPU: %d\n", smp_processor_id());
190 show_regs(regs);
191
192 sp = (unsigned long) (1+regs);
193 if (user_mode(regs)) {
194 in_kernel = 0;
195 sp = regs->spu;
196 printk("SPU: %08lx\n", sp);
197 } else {
198 printk("SPI: %08lx\n", sp);
199 }
200 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
201 current->comm, current->pid, 0xffff & i, 4096+(unsigned long)current);
202
203 /*
204 * When in-kernel, we also print out the stack and code at the
205 * time of the fault..
206 */
207 if (in_kernel) {
208 printk("\nStack: ");
209 show_stack(current, (unsigned long*) sp);
210
211 printk("\nCode: ");
212 if (regs->bpc < PAGE_OFFSET)
213 goto bad;
214
215 for(i=0;i<20;i++) {
216 unsigned char c;
217 if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
218bad:
219 printk(" Bad PC value.");
220 break;
221 }
222 printk("%02x ", c);
223 }
224 }
225 printk("\n");
226}
227
228DEFINE_SPINLOCK(die_lock);
229
230void die(const char * str, struct pt_regs * regs, long err)
231{
232 console_verbose();
233 spin_lock_irq(&die_lock);
234 bust_spinlocks(1);
235 printk("%s: %04lx\n", str, err & 0xffff);
236 show_registers(regs);
237 bust_spinlocks(0);
238 spin_unlock_irq(&die_lock);
239 do_exit(SIGSEGV);
240}
241
242static __inline__ void die_if_kernel(const char * str,
243 struct pt_regs * regs, long err)
244{
245 if (!user_mode(regs))
246 die(str, regs, err);
247}
248
249static __inline__ void do_trap(int trapnr, int signr, const char * str,
250 struct pt_regs * regs, long error_code, siginfo_t *info)
251{
252 if (user_mode(regs)) {
253 /* trap_signal */
254 struct task_struct *tsk = current;
255 tsk->thread.error_code = error_code;
256 tsk->thread.trap_no = trapnr;
257 if (info)
258 force_sig_info(signr, info, tsk);
259 else
260 force_sig(signr, tsk);
261 return;
262 } else {
263 /* kernel_trap */
264 if (!fixup_exception(regs))
265 die(str, regs, error_code);
266 return;
267 }
268}
269
270#define DO_ERROR(trapnr, signr, str, name) \
271asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
272{ \
273 do_trap(trapnr, signr, 0, regs, error_code, NULL); \
274}
275
276#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
277asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
278{ \
279 siginfo_t info; \
280 info.si_signo = signr; \
281 info.si_errno = 0; \
282 info.si_code = sicode; \
283 info.si_addr = (void __user *)siaddr; \
284 do_trap(trapnr, signr, str, regs, error_code, &info); \
285}
286
287DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
288DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
289DO_ERROR_INFO(0x100, SIGILL, "privilege instruction", pie_handler, ILL_PRVOPC, regs->bpc)
290
291extern int handle_unaligned_access(unsigned long, struct pt_regs *);
292
293/* This code taken from arch/sh/kernel/traps.c */
294asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
295{
296 mm_segment_t oldfs;
297 unsigned long insn;
298 int tmp;
299
300 oldfs = get_fs();
301
302 if (user_mode(regs)) {
303 local_irq_enable();
304 current->thread.error_code = error_code;
305 current->thread.trap_no = 0x17;
306
307 set_fs(USER_DS);
308 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
309 set_fs(oldfs);
310 goto uspace_segv;
311 }
312 tmp = handle_unaligned_access(insn, regs);
313 set_fs(oldfs);
314
315 if (!tmp)
316 return;
317
318 uspace_segv:
319 printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
320 "access\n", current->comm);
321 force_sig(SIGSEGV, current);
322 } else {
323 set_fs(KERNEL_DS);
324 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
325 set_fs(oldfs);
326 die("insn faulting in do_address_error", regs, 0);
327 }
328 handle_unaligned_access(insn, regs);
329 set_fs(oldfs);
330 }
331}
332
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