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 #include <asm/uaccess.h>
33
34 unsigned long exception_handlers[32];
35
36 /*
37 * The architecture-independent show_stack generator
38 */
show_stack(struct task_struct * task,unsigned long * sp)39 void show_stack(struct task_struct *task, unsigned long *sp)
40 {
41 int i;
42 long stackdata;
43
44 sp = sp ? sp : (unsigned long *)&sp;
45
46 printk(KERN_NOTICE "Stack: ");
47 i = 1;
48 while ((long) sp & (PAGE_SIZE - 1)) {
49 if (i && ((i % 8) == 0))
50 printk(KERN_NOTICE "\n");
51 if (i > 40) {
52 printk(KERN_NOTICE " ...");
53 break;
54 }
55
56 if (__get_user(stackdata, sp++)) {
57 printk(KERN_NOTICE " (Bad stack address)");
58 break;
59 }
60
61 printk(KERN_NOTICE " %08lx", stackdata);
62 i++;
63 }
64 printk(KERN_NOTICE "\n");
65 }
66
show_trace(long * sp)67 static void show_trace(long *sp)
68 {
69 int i;
70 long addr;
71
72 sp = sp ? sp : (long *) &sp;
73
74 printk(KERN_NOTICE "Call Trace: ");
75 i = 1;
76 while ((long) sp & (PAGE_SIZE - 1)) {
77 if (__get_user(addr, sp++)) {
78 if (i && ((i % 6) == 0))
79 printk(KERN_NOTICE "\n");
80 printk(KERN_NOTICE " (Bad stack address)\n");
81 break;
82 }
83
84 if (kernel_text_address(addr)) {
85 if (i && ((i % 6) == 0))
86 printk(KERN_NOTICE "\n");
87 if (i > 40) {
88 printk(KERN_NOTICE " ...");
89 break;
90 }
91
92 printk(KERN_NOTICE " [<%08lx>]", addr);
93 i++;
94 }
95 }
96 printk(KERN_NOTICE "\n");
97 }
98
show_code(unsigned int * pc)99 static void show_code(unsigned int *pc)
100 {
101 long i;
102
103 printk(KERN_NOTICE "\nCode:");
104
105 for (i = -3; i < 6; i++) {
106 unsigned long insn;
107 if (__get_user(insn, pc + i)) {
108 printk(KERN_NOTICE " (Bad address in epc)\n");
109 break;
110 }
111 printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
112 insn, (i ? ' ' : '>'));
113 }
114 }
115
116 /*
117 * FIXME: really the generic show_regs should take a const pointer argument.
118 */
show_regs(struct pt_regs * regs)119 void show_regs(struct pt_regs *regs)
120 {
121 show_regs_print_info(KERN_DEFAULT);
122
123 printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
124 regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
125 regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
126 printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
127 regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
128 regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
129 printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
130 regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
131 regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
132 printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
133 regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
134 regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
135
136 printk("CEH : %08lx\n", regs->ceh);
137 printk("CEL : %08lx\n", regs->cel);
138
139 printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
140 regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
141 regs->cp0_ecr, regs->cp0_condition);
142 }
143
show_registers(struct pt_regs * regs)144 static void show_registers(struct pt_regs *regs)
145 {
146 show_regs(regs);
147 printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
148 current->comm, current->pid, (unsigned long) current);
149 show_stack(current_thread_info()->task, (long *) regs->regs[0]);
150 show_trace((long *) regs->regs[0]);
151 show_code((unsigned int *) regs->cp0_epc);
152 printk(KERN_NOTICE "\n");
153 }
154
__die(const char * str,struct pt_regs * regs,const char * file,const char * func,unsigned long line)155 void __die(const char *str, struct pt_regs *regs, const char *file,
156 const char *func, unsigned long line)
157 {
158 console_verbose();
159 printk("%s", str);
160 if (file && func)
161 printk(" in %s:%s, line %ld", file, func, line);
162 printk(":\n");
163 show_registers(regs);
164 do_exit(SIGSEGV);
165 }
166
__die_if_kernel(const char * str,struct pt_regs * regs,const char * file,const char * func,unsigned long line)167 void __die_if_kernel(const char *str, struct pt_regs *regs,
168 const char *file, const char *func, unsigned long line)
169 {
170 if (!user_mode(regs))
171 __die(str, regs, file, func, line);
172 }
173
do_adelinsn(struct pt_regs * regs)174 asmlinkage void do_adelinsn(struct pt_regs *regs)
175 {
176 printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
177 regs->cp0_ema, regs->cp0_epc);
178 die_if_kernel("do_ade execution Exception\n", regs);
179 force_sig(SIGBUS, current);
180 }
181
do_adedata(struct pt_regs * regs)182 asmlinkage void do_adedata(struct pt_regs *regs)
183 {
184 const struct exception_table_entry *fixup;
185 fixup = search_exception_tables(regs->cp0_epc);
186 if (fixup) {
187 regs->cp0_epc = fixup->fixup;
188 return;
189 }
190 printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
191 regs->cp0_ema, regs->cp0_epc);
192 die_if_kernel("do_ade execution Exception\n", regs);
193 force_sig(SIGBUS, current);
194 }
195
do_pel(struct pt_regs * regs)196 asmlinkage void do_pel(struct pt_regs *regs)
197 {
198 die_if_kernel("do_pel execution Exception", regs);
199 force_sig(SIGFPE, current);
200 }
201
do_cee(struct pt_regs * regs)202 asmlinkage void do_cee(struct pt_regs *regs)
203 {
204 die_if_kernel("do_cee execution Exception", regs);
205 force_sig(SIGFPE, current);
206 }
207
do_cpe(struct pt_regs * regs)208 asmlinkage void do_cpe(struct pt_regs *regs)
209 {
210 die_if_kernel("do_cpe execution Exception", regs);
211 force_sig(SIGFPE, current);
212 }
213
do_be(struct pt_regs * regs)214 asmlinkage void do_be(struct pt_regs *regs)
215 {
216 die_if_kernel("do_be execution Exception", regs);
217 force_sig(SIGBUS, current);
218 }
219
do_ov(struct pt_regs * regs)220 asmlinkage void do_ov(struct pt_regs *regs)
221 {
222 siginfo_t info;
223
224 die_if_kernel("do_ov execution Exception", regs);
225
226 info.si_code = FPE_INTOVF;
227 info.si_signo = SIGFPE;
228 info.si_errno = 0;
229 info.si_addr = (void *)regs->cp0_epc;
230 force_sig_info(SIGFPE, &info, current);
231 }
232
do_tr(struct pt_regs * regs)233 asmlinkage void do_tr(struct pt_regs *regs)
234 {
235 die_if_kernel("do_tr execution Exception", regs);
236 force_sig(SIGTRAP, current);
237 }
238
do_ri(struct pt_regs * regs)239 asmlinkage void do_ri(struct pt_regs *regs)
240 {
241 unsigned long epc_insn;
242 unsigned long epc = regs->cp0_epc;
243
244 read_tsk_long(current, epc, &epc_insn);
245 if (current->thread.single_step == 1) {
246 if ((epc == current->thread.addr1) ||
247 (epc == current->thread.addr2)) {
248 user_disable_single_step(current);
249 force_sig(SIGTRAP, current);
250 return;
251 } else
252 BUG();
253 } else if ((epc_insn == BREAKPOINT32_INSN) ||
254 ((epc_insn & 0x0000FFFF) == 0x7002) ||
255 ((epc_insn & 0xFFFF0000) == 0x70020000)) {
256 force_sig(SIGTRAP, current);
257 return;
258 } else {
259 die_if_kernel("do_ri execution Exception", regs);
260 force_sig(SIGILL, current);
261 }
262 }
263
do_ccu(struct pt_regs * regs)264 asmlinkage void do_ccu(struct pt_regs *regs)
265 {
266 die_if_kernel("do_ccu execution Exception", regs);
267 force_sig(SIGILL, current);
268 }
269
do_reserved(struct pt_regs * regs)270 asmlinkage void do_reserved(struct pt_regs *regs)
271 {
272 /*
273 * Game over - no way to handle this if it ever occurs. Most probably
274 * caused by a new unknown cpu type or after another deadly
275 * hard/software error.
276 */
277 die_if_kernel("do_reserved execution Exception", regs);
278 show_regs(regs);
279 panic("Caught reserved exception - should not happen.");
280 }
281
282 /*
283 * NMI exception handler.
284 */
nmi_exception_handler(struct pt_regs * regs)285 void nmi_exception_handler(struct pt_regs *regs)
286 {
287 die_if_kernel("nmi_exception_handler execution Exception", regs);
288 die("NMI", regs);
289 }
290
291 /* Install CPU exception handler */
set_except_vector(int n,void * addr)292 void *set_except_vector(int n, void *addr)
293 {
294 unsigned long handler = (unsigned long) addr;
295 unsigned long old_handler = exception_handlers[n];
296
297 exception_handlers[n] = handler;
298 return (void *)old_handler;
299 }
300
trap_init(void)301 void __init trap_init(void)
302 {
303 int i;
304
305 pgd_current = (unsigned long)init_mm.pgd;
306 /* DEBUG EXCEPTION */
307 memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
308 &debug_exception_vector, DEBUG_VECTOR_SIZE);
309 /* NMI EXCEPTION */
310 memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
311 &general_exception_vector, GENERAL_VECTOR_SIZE);
312
313 /*
314 * Initialise exception handlers
315 */
316 for (i = 0; i <= 31; i++)
317 set_except_vector(i, handle_reserved);
318
319 set_except_vector(1, handle_nmi);
320 set_except_vector(2, handle_adelinsn);
321 set_except_vector(3, handle_tlb_refill);
322 set_except_vector(4, handle_tlb_invaild);
323 set_except_vector(5, handle_ibe);
324 set_except_vector(6, handle_pel);
325 set_except_vector(7, handle_sys);
326 set_except_vector(8, handle_ccu);
327 set_except_vector(9, handle_ri);
328 set_except_vector(10, handle_tr);
329 set_except_vector(11, handle_adedata);
330 set_except_vector(12, handle_adedata);
331 set_except_vector(13, handle_tlb_refill);
332 set_except_vector(14, handle_tlb_invaild);
333 set_except_vector(15, handle_mod);
334 set_except_vector(16, handle_cee);
335 set_except_vector(17, handle_cpe);
336 set_except_vector(18, handle_dbe);
337 flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);
338
339 atomic_inc(&init_mm.mm_count);
340 current->active_mm = &init_mm;
341 cpu_cache_init();
342 }
343