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Linux/arch/score/kernel/traps.c

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  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  */
 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 
 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 
 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  */
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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  */
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 */
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 
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 

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