arch/score/kernel/traps.c

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