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