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