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/extable.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/sched/mm.h>
  29 #include <linux/sched/signal.h>
  30 #include <linux/sched/debug.h>
  31 #include <linux/mm_types.h>
  32
  33 #include <asm/cacheflush.h>
  34 #include <asm/irq.h>
  35 #include <asm/irq_regs.h>
  36 #include <linux/uaccess.h>
  37
  38 unsigned long exception_handlers[32];
  39
  40 /*
  41  * The architecture-independent show_stack generator
  42  */
  43 void show_stack(struct task_struct *task, unsigned long *sp)
  44 {
  45         int i;
  46         long stackdata;
  47
  48         sp = sp ? sp : (unsigned long *)&sp;
  49
  50         printk(KERN_NOTICE "Stack: ");
  51         i = 1;
  52         while ((long) sp & (PAGE_SIZE - 1)) {
  53                 if (i && ((i % 8) == 0))
  54                         printk(KERN_NOTICE "\n");
  55                 if (i > 40) {
  56                         printk(KERN_NOTICE " ...");
  57                         break;
  58                 }
  59
  60                 if (__get_user(stackdata, sp++)) {
  61                         printk(KERN_NOTICE " (Bad stack address)");
  62                         break;
  63                 }
  64
  65                 printk(KERN_NOTICE " %08lx", stackdata);
  66                 i++;
  67         }
  68         printk(KERN_NOTICE "\n");
  69 }
  70
  71 static void show_trace(long *sp)
  72 {
  73         int i;
  74         long addr;
  75
  76         sp = sp ? sp : (long *) &sp;
  77
  78         printk(KERN_NOTICE "Call Trace:  ");
  79         i = 1;
  80         while ((long) sp & (PAGE_SIZE - 1)) {
  81                 if (__get_user(addr, sp++)) {
  82                         if (i && ((i % 6) == 0))
  83                                 printk(KERN_NOTICE "\n");
  84                         printk(KERN_NOTICE " (Bad stack address)\n");
  85                         break;
  86                 }
  87
  88                 if (kernel_text_address(addr)) {
  89                         if (i && ((i % 6) == 0))
  90                                 printk(KERN_NOTICE "\n");
  91                         if (i > 40) {
  92                                 printk(KERN_NOTICE " ...");
  93                                 break;
  94                         }
  95
  96                         printk(KERN_NOTICE " [<%08lx>]", addr);
  97                         i++;
  98                 }
  99         }
 100         printk(KERN_NOTICE "\n");
 101 }
 102
 103 static void show_code(unsigned int *pc)
 104 {
 105         long i;
 106
 107         printk(KERN_NOTICE "\nCode:");
 108
 109         for (i = -3; i < 6; i++) {
 110                 unsigned long insn;
 111                 if (__get_user(insn, pc + i)) {
 112                         printk(KERN_NOTICE " (Bad address in epc)\n");
 113                         break;
 114                 }
 115                 printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
 116                         insn, (i ? ' ' : '>'));
 117         }
 118 }
 119
 120 /*
 121  * FIXME: really the generic show_regs should take a const pointer argument.
 122  */
 123 void show_regs(struct pt_regs *regs)
 124 {
 125         show_regs_print_info(KERN_DEFAULT);
 126
 127         printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 128                 regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
 129                 regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
 130         printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 131                 regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
 132                 regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
 133         printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 134                 regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
 135                 regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
 136         printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 137                 regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
 138                 regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
 139
 140         printk("CEH : %08lx\n", regs->ceh);
 141         printk("CEL : %08lx\n", regs->cel);
 142
 143         printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
 144                 regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
 145                 regs->cp0_ecr, regs->cp0_condition);
 146 }
 147
 148 static void show_registers(struct pt_regs *regs)
 149 {
 150         show_regs(regs);
 151         printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
 152                 current->comm, current->pid, (unsigned long) current);
 153         show_stack(current_thread_info()->task, (long *) regs->regs[0]);
 154         show_trace((long *) regs->regs[0]);
 155         show_code((unsigned int *) regs->cp0_epc);
 156         printk(KERN_NOTICE "\n");
 157 }
 158
 159 void __die(const char *str, struct pt_regs *regs, const char *file,
 160         const char *func, unsigned long line)
 161 {
 162         console_verbose();
 163         printk("%s", str);
 164         if (file && func)
 165                 printk(" in %s:%s, line %ld", file, func, line);
 166         printk(":\n");
 167         show_registers(regs);
 168         do_exit(SIGSEGV);
 169 }
 170
 171 void __die_if_kernel(const char *str, struct pt_regs *regs,
 172                 const char *file, const char *func, unsigned long line)
 173 {
 174         if (!user_mode(regs))
 175                 __die(str, regs, file, func, line);
 176 }
 177
 178 asmlinkage void do_adelinsn(struct pt_regs *regs)
 179 {
 180         printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
 181                  regs->cp0_ema, regs->cp0_epc);
 182         die_if_kernel("do_ade execution Exception\n", regs);
 183         force_sig(SIGBUS, current);
 184 }
 185
 186 asmlinkage void do_adedata(struct pt_regs *regs)
 187 {
 188         const struct exception_table_entry *fixup;
 189         fixup = search_exception_tables(regs->cp0_epc);
 190         if (fixup) {
 191                 regs->cp0_epc = fixup->fixup;
 192                 return;
 193         }
 194         printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
 195                  regs->cp0_ema, regs->cp0_epc);
 196         die_if_kernel("do_ade execution Exception\n", regs);
 197         force_sig(SIGBUS, current);
 198 }
 199
 200 asmlinkage void do_pel(struct pt_regs *regs)
 201 {
 202         die_if_kernel("do_pel execution Exception", regs);
 203         force_sig(SIGFPE, current);
 204 }
 205
 206 asmlinkage void do_cee(struct pt_regs *regs)
 207 {
 208         die_if_kernel("do_cee execution Exception", regs);
 209         force_sig(SIGFPE, current);
 210 }
 211
 212 asmlinkage void do_cpe(struct pt_regs *regs)
 213 {
 214         die_if_kernel("do_cpe execution Exception", regs);
 215         force_sig(SIGFPE, current);
 216 }
 217
 218 asmlinkage void do_be(struct pt_regs *regs)
 219 {
 220         die_if_kernel("do_be execution Exception", regs);
 221         force_sig(SIGBUS, current);
 222 }
 223
 224 asmlinkage void do_ov(struct pt_regs *regs)
 225 {
 226         siginfo_t info;
 227
 228         die_if_kernel("do_ov execution Exception", regs);
 229
 230         info.si_code = FPE_INTOVF;
 231         info.si_signo = SIGFPE;
 232         info.si_errno = 0;
 233         info.si_addr = (void *)regs->cp0_epc;
 234         force_sig_info(SIGFPE, &info, current);
 235 }
 236
 237 asmlinkage void do_tr(struct pt_regs *regs)
 238 {
 239         die_if_kernel("do_tr execution Exception", regs);
 240         force_sig(SIGTRAP, current);
 241 }
 242
 243 asmlinkage void do_ri(struct pt_regs *regs)
 244 {
 245         unsigned long epc_insn;
 246         unsigned long epc = regs->cp0_epc;
 247
 248         read_tsk_long(current, epc, &epc_insn);
 249         if (current->thread.single_step == 1) {
 250                 if ((epc == current->thread.addr1) ||
 251                     (epc == current->thread.addr2)) {
 252                         user_disable_single_step(current);
 253                         force_sig(SIGTRAP, current);
 254                         return;
 255                 } else
 256                         BUG();
 257         } else if ((epc_insn == BREAKPOINT32_INSN) ||
 258                    ((epc_insn & 0x0000FFFF) == 0x7002) ||
 259                    ((epc_insn & 0xFFFF0000) == 0x70020000)) {
 260                         force_sig(SIGTRAP, current);
 261                         return;
 262         } else {
 263                 die_if_kernel("do_ri execution Exception", regs);
 264                 force_sig(SIGILL, current);
 265         }
 266 }
 267
 268 asmlinkage void do_ccu(struct pt_regs *regs)
 269 {
 270         die_if_kernel("do_ccu execution Exception", regs);
 271         force_sig(SIGILL, current);
 272 }
 273
 274 asmlinkage void do_reserved(struct pt_regs *regs)
 275 {
 276         /*
 277          * Game over - no way to handle this if it ever occurs.  Most probably
 278          * caused by a new unknown cpu type or after another deadly
 279          * hard/software error.
 280          */
 281         die_if_kernel("do_reserved execution Exception", regs);
 282         show_regs(regs);
 283         panic("Caught reserved exception - should not happen.");
 284 }
 285
 286 /*
 287  * NMI exception handler.
 288  */
 289 void nmi_exception_handler(struct pt_regs *regs)
 290 {
 291         die_if_kernel("nmi_exception_handler execution Exception", regs);
 292         die("NMI", regs);
 293 }
 294
 295 /* Install CPU exception handler */
 296 void *set_except_vector(int n, void *addr)
 297 {
 298         unsigned long handler = (unsigned long) addr;
 299         unsigned long old_handler = exception_handlers[n];
 300
 301         exception_handlers[n] = handler;
 302         return (void *)old_handler;
 303 }
 304
 305 void __init trap_init(void)
 306 {
 307         int i;
 308
 309         pgd_current = (unsigned long)init_mm.pgd;
 310         /* DEBUG EXCEPTION */
 311         memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
 312                         &debug_exception_vector, DEBUG_VECTOR_SIZE);
 313         /* NMI EXCEPTION */
 314         memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
 315                         &general_exception_vector, GENERAL_VECTOR_SIZE);
 316
 317         /*
 318          * Initialise exception handlers
 319          */
 320         for (i = 0; i <= 31; i++)
 321                 set_except_vector(i, handle_reserved);
 322
 323         set_except_vector(1, handle_nmi);
 324         set_except_vector(2, handle_adelinsn);
 325         set_except_vector(3, handle_tlb_refill);
 326         set_except_vector(4, handle_tlb_invaild);
 327         set_except_vector(5, handle_ibe);
 328         set_except_vector(6, handle_pel);
 329         set_except_vector(7, handle_sys);
 330         set_except_vector(8, handle_ccu);
 331         set_except_vector(9, handle_ri);
 332         set_except_vector(10, handle_tr);
 333         set_except_vector(11, handle_adedata);
 334         set_except_vector(12, handle_adedata);
 335         set_except_vector(13, handle_tlb_refill);
 336         set_except_vector(14, handle_tlb_invaild);
 337         set_except_vector(15, handle_mod);
 338         set_except_vector(16, handle_cee);
 339         set_except_vector(17, handle_cpe);
 340         set_except_vector(18, handle_dbe);
 341         flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);
 342
 343         mmgrab(&init_mm);
 344         current->active_mm = &init_mm;
 345         cpu_cache_init();
 346 }