Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 1 | /* |
| 2 | * 'traps.c' handles hardware traps and faults after we have saved some |
| 3 | * state in 'entry.S'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * SuperH version: Copyright (C) 1999 Niibe Yutaka |
| 6 | * Copyright (C) 2000 Philipp Rumpf |
| 7 | * Copyright (C) 2000 David Howells |
Paul Mundt | 3a2e117 | 2007-05-01 16:33:10 +0900 | [diff] [blame] | 8 | * Copyright (C) 2002 - 2007 Paul Mundt |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 9 | * |
| 10 | * This file is subject to the terms and conditions of the GNU General Public |
| 11 | * License. See the file "COPYING" in the main directory of this archive |
| 12 | * for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/kallsyms.h> |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 20 | #include <linux/io.h> |
Paul Mundt | fa69151 | 2007-03-08 19:41:21 +0900 | [diff] [blame] | 21 | #include <linux/bug.h> |
Paul Mundt | 9b8c90e | 2006-12-06 11:07:51 +0900 | [diff] [blame] | 22 | #include <linux/debug_locks.h> |
Paul Mundt | b118ca5 | 2007-05-09 10:55:38 +0900 | [diff] [blame] | 23 | #include <linux/kdebug.h> |
Paul Mundt | e113276 | 2007-05-15 08:36:36 +0900 | [diff] [blame] | 24 | #include <linux/kexec.h> |
Paul Mundt | dc34d31 | 2006-12-08 17:41:43 +0900 | [diff] [blame] | 25 | #include <linux/limits.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/system.h> |
| 27 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #ifdef CONFIG_SH_KGDB |
| 30 | #include <asm/kgdb.h> |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 31 | #define CHK_REMOTE_DEBUG(regs) \ |
| 32 | { \ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 33 | if (kgdb_debug_hook && !user_mode(regs))\ |
| 34 | (*kgdb_debug_hook)(regs); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | } |
| 36 | #else |
| 37 | #define CHK_REMOTE_DEBUG(regs) |
| 38 | #endif |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #ifdef CONFIG_CPU_SH2 |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 41 | # define TRAP_RESERVED_INST 4 |
| 42 | # define TRAP_ILLEGAL_SLOT_INST 6 |
| 43 | # define TRAP_ADDRESS_ERROR 9 |
| 44 | # ifdef CONFIG_CPU_SH2A |
| 45 | # define TRAP_DIVZERO_ERROR 17 |
| 46 | # define TRAP_DIVOVF_ERROR 18 |
| 47 | # endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #else |
| 49 | #define TRAP_RESERVED_INST 12 |
| 50 | #define TRAP_ILLEGAL_SLOT_INST 13 |
| 51 | #endif |
| 52 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 53 | static void dump_mem(const char *str, unsigned long bottom, unsigned long top) |
| 54 | { |
| 55 | unsigned long p; |
| 56 | int i; |
| 57 | |
| 58 | printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top); |
| 59 | |
| 60 | for (p = bottom & ~31; p < top; ) { |
| 61 | printk("%04lx: ", p & 0xffff); |
| 62 | |
| 63 | for (i = 0; i < 8; i++, p += 4) { |
| 64 | unsigned int val; |
| 65 | |
| 66 | if (p < bottom || p >= top) |
| 67 | printk(" "); |
| 68 | else { |
| 69 | if (__get_user(val, (unsigned int __user *)p)) { |
| 70 | printk("\n"); |
| 71 | return; |
| 72 | } |
| 73 | printk("%08x ", val); |
| 74 | } |
| 75 | } |
| 76 | printk("\n"); |
| 77 | } |
| 78 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Paul Mundt | 3a2e117 | 2007-05-01 16:33:10 +0900 | [diff] [blame] | 80 | static DEFINE_SPINLOCK(die_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | void die(const char * str, struct pt_regs * regs, long err) |
| 83 | { |
| 84 | static int die_counter; |
| 85 | |
| 86 | console_verbose(); |
| 87 | spin_lock_irq(&die_lock); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 88 | bust_spinlocks(1); |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | CHK_REMOTE_DEBUG(regs); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 93 | print_modules(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | show_regs(regs); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 95 | |
| 96 | printk("Process: %s (pid: %d, stack limit = %p)\n", |
| 97 | current->comm, current->pid, task_stack_page(current) + 1); |
| 98 | |
| 99 | if (!user_mode(regs) || in_interrupt()) |
| 100 | dump_mem("Stack: ", regs->regs[15], THREAD_SIZE + |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 101 | (unsigned long)task_stack_page(current)); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 102 | |
| 103 | bust_spinlocks(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | spin_unlock_irq(&die_lock); |
Paul Mundt | e113276 | 2007-05-15 08:36:36 +0900 | [diff] [blame] | 105 | |
| 106 | if (kexec_should_crash(current)) |
| 107 | crash_kexec(regs); |
| 108 | |
| 109 | if (in_interrupt()) |
| 110 | panic("Fatal exception in interrupt"); |
| 111 | |
| 112 | if (panic_on_oops) |
| 113 | panic("Fatal exception"); |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | do_exit(SIGSEGV); |
| 116 | } |
| 117 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 118 | static inline void die_if_kernel(const char *str, struct pt_regs *regs, |
| 119 | long err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
| 121 | if (!user_mode(regs)) |
| 122 | die(str, regs, err); |
| 123 | } |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | /* |
| 126 | * try and fix up kernelspace address errors |
| 127 | * - userspace errors just cause EFAULT to be returned, resulting in SEGV |
| 128 | * - kernel/userspace interfaces cause a jump to an appropriate handler |
| 129 | * - other kernel errors are bad |
| 130 | * - return 0 if fixed-up, -EFAULT if non-fatal (to the kernel) fault |
| 131 | */ |
| 132 | static int die_if_no_fixup(const char * str, struct pt_regs * regs, long err) |
| 133 | { |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 134 | if (!user_mode(regs)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | const struct exception_table_entry *fixup; |
| 136 | fixup = search_exception_tables(regs->pc); |
| 137 | if (fixup) { |
| 138 | regs->pc = fixup->fixup; |
| 139 | return 0; |
| 140 | } |
| 141 | die(str, regs, err); |
| 142 | } |
| 143 | return -EFAULT; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * handle an instruction that does an unaligned memory access by emulating the |
| 148 | * desired behaviour |
| 149 | * - note that PC _may not_ point to the faulting instruction |
| 150 | * (if that instruction is in a branch delay slot) |
| 151 | * - return 0 if emulation okay, -EFAULT on existential error |
| 152 | */ |
| 153 | static int handle_unaligned_ins(u16 instruction, struct pt_regs *regs) |
| 154 | { |
| 155 | int ret, index, count; |
| 156 | unsigned long *rm, *rn; |
| 157 | unsigned char *src, *dst; |
| 158 | |
| 159 | index = (instruction>>8)&15; /* 0x0F00 */ |
| 160 | rn = ®s->regs[index]; |
| 161 | |
| 162 | index = (instruction>>4)&15; /* 0x00F0 */ |
| 163 | rm = ®s->regs[index]; |
| 164 | |
| 165 | count = 1<<(instruction&3); |
| 166 | |
| 167 | ret = -EFAULT; |
| 168 | switch (instruction>>12) { |
| 169 | case 0: /* mov.[bwl] to/from memory via r0+rn */ |
| 170 | if (instruction & 8) { |
| 171 | /* from memory */ |
| 172 | src = (unsigned char*) *rm; |
| 173 | src += regs->regs[0]; |
| 174 | dst = (unsigned char*) rn; |
| 175 | *(unsigned long*)dst = 0; |
| 176 | |
| 177 | #ifdef __LITTLE_ENDIAN__ |
| 178 | if (copy_from_user(dst, src, count)) |
| 179 | goto fetch_fault; |
| 180 | |
| 181 | if ((count == 2) && dst[1] & 0x80) { |
| 182 | dst[2] = 0xff; |
| 183 | dst[3] = 0xff; |
| 184 | } |
| 185 | #else |
| 186 | dst += 4-count; |
| 187 | |
| 188 | if (__copy_user(dst, src, count)) |
| 189 | goto fetch_fault; |
| 190 | |
| 191 | if ((count == 2) && dst[2] & 0x80) { |
| 192 | dst[0] = 0xff; |
| 193 | dst[1] = 0xff; |
| 194 | } |
| 195 | #endif |
| 196 | } else { |
| 197 | /* to memory */ |
| 198 | src = (unsigned char*) rm; |
| 199 | #if !defined(__LITTLE_ENDIAN__) |
| 200 | src += 4-count; |
| 201 | #endif |
| 202 | dst = (unsigned char*) *rn; |
| 203 | dst += regs->regs[0]; |
| 204 | |
| 205 | if (copy_to_user(dst, src, count)) |
| 206 | goto fetch_fault; |
| 207 | } |
| 208 | ret = 0; |
| 209 | break; |
| 210 | |
| 211 | case 1: /* mov.l Rm,@(disp,Rn) */ |
| 212 | src = (unsigned char*) rm; |
| 213 | dst = (unsigned char*) *rn; |
| 214 | dst += (instruction&0x000F)<<2; |
| 215 | |
| 216 | if (copy_to_user(dst,src,4)) |
| 217 | goto fetch_fault; |
| 218 | ret = 0; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 219 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
| 221 | case 2: /* mov.[bwl] to memory, possibly with pre-decrement */ |
| 222 | if (instruction & 4) |
| 223 | *rn -= count; |
| 224 | src = (unsigned char*) rm; |
| 225 | dst = (unsigned char*) *rn; |
| 226 | #if !defined(__LITTLE_ENDIAN__) |
| 227 | src += 4-count; |
| 228 | #endif |
| 229 | if (copy_to_user(dst, src, count)) |
| 230 | goto fetch_fault; |
| 231 | ret = 0; |
| 232 | break; |
| 233 | |
| 234 | case 5: /* mov.l @(disp,Rm),Rn */ |
| 235 | src = (unsigned char*) *rm; |
| 236 | src += (instruction&0x000F)<<2; |
| 237 | dst = (unsigned char*) rn; |
| 238 | *(unsigned long*)dst = 0; |
| 239 | |
| 240 | if (copy_from_user(dst,src,4)) |
| 241 | goto fetch_fault; |
| 242 | ret = 0; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 243 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | case 6: /* mov.[bwl] from memory, possibly with post-increment */ |
| 246 | src = (unsigned char*) *rm; |
| 247 | if (instruction & 4) |
| 248 | *rm += count; |
| 249 | dst = (unsigned char*) rn; |
| 250 | *(unsigned long*)dst = 0; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | #ifdef __LITTLE_ENDIAN__ |
| 253 | if (copy_from_user(dst, src, count)) |
| 254 | goto fetch_fault; |
| 255 | |
| 256 | if ((count == 2) && dst[1] & 0x80) { |
| 257 | dst[2] = 0xff; |
| 258 | dst[3] = 0xff; |
| 259 | } |
| 260 | #else |
| 261 | dst += 4-count; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | if (copy_from_user(dst, src, count)) |
| 264 | goto fetch_fault; |
| 265 | |
| 266 | if ((count == 2) && dst[2] & 0x80) { |
| 267 | dst[0] = 0xff; |
| 268 | dst[1] = 0xff; |
| 269 | } |
| 270 | #endif |
| 271 | ret = 0; |
| 272 | break; |
| 273 | |
| 274 | case 8: |
| 275 | switch ((instruction&0xFF00)>>8) { |
| 276 | case 0x81: /* mov.w R0,@(disp,Rn) */ |
| 277 | src = (unsigned char*) ®s->regs[0]; |
| 278 | #if !defined(__LITTLE_ENDIAN__) |
| 279 | src += 2; |
| 280 | #endif |
| 281 | dst = (unsigned char*) *rm; /* called Rn in the spec */ |
| 282 | dst += (instruction&0x000F)<<1; |
| 283 | |
| 284 | if (copy_to_user(dst, src, 2)) |
| 285 | goto fetch_fault; |
| 286 | ret = 0; |
| 287 | break; |
| 288 | |
| 289 | case 0x85: /* mov.w @(disp,Rm),R0 */ |
| 290 | src = (unsigned char*) *rm; |
| 291 | src += (instruction&0x000F)<<1; |
| 292 | dst = (unsigned char*) ®s->regs[0]; |
| 293 | *(unsigned long*)dst = 0; |
| 294 | |
| 295 | #if !defined(__LITTLE_ENDIAN__) |
| 296 | dst += 2; |
| 297 | #endif |
| 298 | |
| 299 | if (copy_from_user(dst, src, 2)) |
| 300 | goto fetch_fault; |
| 301 | |
| 302 | #ifdef __LITTLE_ENDIAN__ |
| 303 | if (dst[1] & 0x80) { |
| 304 | dst[2] = 0xff; |
| 305 | dst[3] = 0xff; |
| 306 | } |
| 307 | #else |
| 308 | if (dst[2] & 0x80) { |
| 309 | dst[0] = 0xff; |
| 310 | dst[1] = 0xff; |
| 311 | } |
| 312 | #endif |
| 313 | ret = 0; |
| 314 | break; |
| 315 | } |
| 316 | break; |
| 317 | } |
| 318 | return ret; |
| 319 | |
| 320 | fetch_fault: |
| 321 | /* Argh. Address not only misaligned but also non-existent. |
| 322 | * Raise an EFAULT and see if it's trapped |
| 323 | */ |
| 324 | return die_if_no_fixup("Fault in unaligned fixup", regs, 0); |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * emulate the instruction in the delay slot |
| 329 | * - fetches the instruction from PC+2 |
| 330 | */ |
| 331 | static inline int handle_unaligned_delayslot(struct pt_regs *regs) |
| 332 | { |
| 333 | u16 instruction; |
| 334 | |
| 335 | if (copy_from_user(&instruction, (u16 *)(regs->pc+2), 2)) { |
| 336 | /* the instruction-fetch faulted */ |
| 337 | if (user_mode(regs)) |
| 338 | return -EFAULT; |
| 339 | |
| 340 | /* kernel */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 341 | die("delay-slot-insn faulting in handle_unaligned_delayslot", |
| 342 | regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | return handle_unaligned_ins(instruction,regs); |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * handle an instruction that does an unaligned memory access |
| 350 | * - have to be careful of branch delay-slot instructions that fault |
| 351 | * SH3: |
| 352 | * - if the branch would be taken PC points to the branch |
| 353 | * - if the branch would not be taken, PC points to delay-slot |
| 354 | * SH4: |
| 355 | * - PC always points to delayed branch |
| 356 | * - return 0 if handled, -EFAULT if failed (may not return if in kernel) |
| 357 | */ |
| 358 | |
| 359 | /* Macros to determine offset from current PC for branch instructions */ |
| 360 | /* Explicit type coercion is used to force sign extension where needed */ |
| 361 | #define SH_PC_8BIT_OFFSET(instr) ((((signed char)(instr))*2) + 4) |
| 362 | #define SH_PC_12BIT_OFFSET(instr) ((((signed short)(instr<<4))>>3) + 4) |
| 363 | |
Paul Mundt | 710ee0c | 2006-11-05 16:48:42 +0900 | [diff] [blame] | 364 | /* |
| 365 | * XXX: SH-2A needs this too, but it needs an overhaul thanks to mixed 32-bit |
| 366 | * opcodes.. |
| 367 | */ |
| 368 | #ifndef CONFIG_CPU_SH2A |
| 369 | static int handle_unaligned_notify_count = 10; |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | static int handle_unaligned_access(u16 instruction, struct pt_regs *regs) |
| 372 | { |
| 373 | u_int rm; |
| 374 | int ret, index; |
| 375 | |
| 376 | index = (instruction>>8)&15; /* 0x0F00 */ |
| 377 | rm = regs->regs[index]; |
| 378 | |
| 379 | /* shout about the first ten userspace fixups */ |
| 380 | if (user_mode(regs) && handle_unaligned_notify_count>0) { |
| 381 | handle_unaligned_notify_count--; |
| 382 | |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 383 | printk(KERN_NOTICE "Fixing up unaligned userspace access " |
| 384 | "in \"%s\" pid=%d pc=0x%p ins=0x%04hx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | current->comm,current->pid,(u16*)regs->pc,instruction); |
| 386 | } |
| 387 | |
| 388 | ret = -EFAULT; |
| 389 | switch (instruction&0xF000) { |
| 390 | case 0x0000: |
| 391 | if (instruction==0x000B) { |
| 392 | /* rts */ |
| 393 | ret = handle_unaligned_delayslot(regs); |
| 394 | if (ret==0) |
| 395 | regs->pc = regs->pr; |
| 396 | } |
| 397 | else if ((instruction&0x00FF)==0x0023) { |
| 398 | /* braf @Rm */ |
| 399 | ret = handle_unaligned_delayslot(regs); |
| 400 | if (ret==0) |
| 401 | regs->pc += rm + 4; |
| 402 | } |
| 403 | else if ((instruction&0x00FF)==0x0003) { |
| 404 | /* bsrf @Rm */ |
| 405 | ret = handle_unaligned_delayslot(regs); |
| 406 | if (ret==0) { |
| 407 | regs->pr = regs->pc + 4; |
| 408 | regs->pc += rm + 4; |
| 409 | } |
| 410 | } |
| 411 | else { |
| 412 | /* mov.[bwl] to/from memory via r0+rn */ |
| 413 | goto simple; |
| 414 | } |
| 415 | break; |
| 416 | |
| 417 | case 0x1000: /* mov.l Rm,@(disp,Rn) */ |
| 418 | goto simple; |
| 419 | |
| 420 | case 0x2000: /* mov.[bwl] to memory, possibly with pre-decrement */ |
| 421 | goto simple; |
| 422 | |
| 423 | case 0x4000: |
| 424 | if ((instruction&0x00FF)==0x002B) { |
| 425 | /* jmp @Rm */ |
| 426 | ret = handle_unaligned_delayslot(regs); |
| 427 | if (ret==0) |
| 428 | regs->pc = rm; |
| 429 | } |
| 430 | else if ((instruction&0x00FF)==0x000B) { |
| 431 | /* jsr @Rm */ |
| 432 | ret = handle_unaligned_delayslot(regs); |
| 433 | if (ret==0) { |
| 434 | regs->pr = regs->pc + 4; |
| 435 | regs->pc = rm; |
| 436 | } |
| 437 | } |
| 438 | else { |
| 439 | /* mov.[bwl] to/from memory via r0+rn */ |
| 440 | goto simple; |
| 441 | } |
| 442 | break; |
| 443 | |
| 444 | case 0x5000: /* mov.l @(disp,Rm),Rn */ |
| 445 | goto simple; |
| 446 | |
| 447 | case 0x6000: /* mov.[bwl] from memory, possibly with post-increment */ |
| 448 | goto simple; |
| 449 | |
| 450 | case 0x8000: /* bf lab, bf/s lab, bt lab, bt/s lab */ |
| 451 | switch (instruction&0x0F00) { |
| 452 | case 0x0100: /* mov.w R0,@(disp,Rm) */ |
| 453 | goto simple; |
| 454 | case 0x0500: /* mov.w @(disp,Rm),R0 */ |
| 455 | goto simple; |
| 456 | case 0x0B00: /* bf lab - no delayslot*/ |
| 457 | break; |
| 458 | case 0x0F00: /* bf/s lab */ |
| 459 | ret = handle_unaligned_delayslot(regs); |
| 460 | if (ret==0) { |
| 461 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) |
| 462 | if ((regs->sr & 0x00000001) != 0) |
| 463 | regs->pc += 4; /* next after slot */ |
| 464 | else |
| 465 | #endif |
| 466 | regs->pc += SH_PC_8BIT_OFFSET(instruction); |
| 467 | } |
| 468 | break; |
| 469 | case 0x0900: /* bt lab - no delayslot */ |
| 470 | break; |
| 471 | case 0x0D00: /* bt/s lab */ |
| 472 | ret = handle_unaligned_delayslot(regs); |
| 473 | if (ret==0) { |
| 474 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) |
| 475 | if ((regs->sr & 0x00000001) == 0) |
| 476 | regs->pc += 4; /* next after slot */ |
| 477 | else |
| 478 | #endif |
| 479 | regs->pc += SH_PC_8BIT_OFFSET(instruction); |
| 480 | } |
| 481 | break; |
| 482 | } |
| 483 | break; |
| 484 | |
| 485 | case 0xA000: /* bra label */ |
| 486 | ret = handle_unaligned_delayslot(regs); |
| 487 | if (ret==0) |
| 488 | regs->pc += SH_PC_12BIT_OFFSET(instruction); |
| 489 | break; |
| 490 | |
| 491 | case 0xB000: /* bsr label */ |
| 492 | ret = handle_unaligned_delayslot(regs); |
| 493 | if (ret==0) { |
| 494 | regs->pr = regs->pc + 4; |
| 495 | regs->pc += SH_PC_12BIT_OFFSET(instruction); |
| 496 | } |
| 497 | break; |
| 498 | } |
| 499 | return ret; |
| 500 | |
| 501 | /* handle non-delay-slot instruction */ |
| 502 | simple: |
| 503 | ret = handle_unaligned_ins(instruction,regs); |
| 504 | if (ret==0) |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 505 | regs->pc += instruction_size(instruction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | return ret; |
| 507 | } |
Paul Mundt | 710ee0c | 2006-11-05 16:48:42 +0900 | [diff] [blame] | 508 | #endif /* CONFIG_CPU_SH2A */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 510 | #ifdef CONFIG_CPU_HAS_SR_RB |
| 511 | #define lookup_exception_vector(x) \ |
| 512 | __asm__ __volatile__ ("stc r2_bank, %0\n\t" : "=r" ((x))) |
| 513 | #else |
| 514 | #define lookup_exception_vector(x) \ |
| 515 | __asm__ __volatile__ ("mov r4, %0\n\t" : "=r" ((x))) |
| 516 | #endif |
| 517 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | /* |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 519 | * Handle various address error exceptions: |
| 520 | * - instruction address error: |
| 521 | * misaligned PC |
| 522 | * PC >= 0x80000000 in user mode |
| 523 | * - data address error (read and write) |
| 524 | * misaligned data access |
| 525 | * access to >= 0x80000000 is user mode |
| 526 | * Unfortuntaly we can't distinguish between instruction address error |
Simon Arlott | e868d61 | 2007-05-14 08:15:10 +0900 | [diff] [blame] | 527 | * and data address errors caused by read accesses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | */ |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 529 | asmlinkage void do_address_error(struct pt_regs *regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | unsigned long writeaccess, |
| 531 | unsigned long address) |
| 532 | { |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 533 | unsigned long error_code = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | mm_segment_t oldfs; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 535 | siginfo_t info; |
Paul Mundt | 710ee0c | 2006-11-05 16:48:42 +0900 | [diff] [blame] | 536 | #ifndef CONFIG_CPU_SH2A |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | u16 instruction; |
| 538 | int tmp; |
Paul Mundt | 710ee0c | 2006-11-05 16:48:42 +0900 | [diff] [blame] | 539 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 541 | /* Intentional ifdef */ |
| 542 | #ifdef CONFIG_CPU_HAS_SR_RB |
| 543 | lookup_exception_vector(error_code); |
| 544 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | oldfs = get_fs(); |
| 547 | |
| 548 | if (user_mode(regs)) { |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 549 | int si_code = BUS_ADRERR; |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | /* bad PC is not something we can fix */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 554 | if (regs->pc & 1) { |
| 555 | si_code = BUS_ADRALN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | goto uspace_segv; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 557 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 559 | #ifndef CONFIG_CPU_SH2A |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | set_fs(USER_DS); |
| 561 | if (copy_from_user(&instruction, (u16 *)(regs->pc), 2)) { |
| 562 | /* Argh. Fault on the instruction itself. |
| 563 | This should never happen non-SMP |
| 564 | */ |
| 565 | set_fs(oldfs); |
| 566 | goto uspace_segv; |
| 567 | } |
| 568 | |
| 569 | tmp = handle_unaligned_access(instruction, regs); |
| 570 | set_fs(oldfs); |
| 571 | |
| 572 | if (tmp==0) |
| 573 | return; /* sorted */ |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 574 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 576 | uspace_segv: |
| 577 | printk(KERN_NOTICE "Sending SIGBUS to \"%s\" due to unaligned " |
| 578 | "access (PC %lx PR %lx)\n", current->comm, regs->pc, |
| 579 | regs->pr); |
| 580 | |
| 581 | info.si_signo = SIGBUS; |
| 582 | info.si_errno = 0; |
| 583 | info.si_code = si_code; |
Paul Mundt | e08f457 | 2007-05-14 12:52:56 +0900 | [diff] [blame] | 584 | info.si_addr = (void __user *)address; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 585 | force_sig_info(SIGBUS, &info, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | } else { |
| 587 | if (regs->pc & 1) |
| 588 | die("unaligned program counter", regs, error_code); |
| 589 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 590 | #ifndef CONFIG_CPU_SH2A |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | set_fs(KERNEL_DS); |
| 592 | if (copy_from_user(&instruction, (u16 *)(regs->pc), 2)) { |
| 593 | /* Argh. Fault on the instruction itself. |
| 594 | This should never happen non-SMP |
| 595 | */ |
| 596 | set_fs(oldfs); |
| 597 | die("insn faulting in do_address_error", regs, 0); |
| 598 | } |
| 599 | |
| 600 | handle_unaligned_access(instruction, regs); |
| 601 | set_fs(oldfs); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 602 | #else |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 603 | printk(KERN_NOTICE "Killing process \"%s\" due to unaligned " |
| 604 | "access\n", current->comm); |
| 605 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 606 | force_sig(SIGSEGV, current); |
| 607 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | } |
| 610 | |
| 611 | #ifdef CONFIG_SH_DSP |
| 612 | /* |
| 613 | * SH-DSP support gerg@snapgear.com. |
| 614 | */ |
| 615 | int is_dsp_inst(struct pt_regs *regs) |
| 616 | { |
Paul Mundt | 882c12c | 2007-05-14 17:26:34 +0900 | [diff] [blame^] | 617 | unsigned short inst = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 619 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | * Safe guard if DSP mode is already enabled or we're lacking |
| 621 | * the DSP altogether. |
| 622 | */ |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 623 | if (!(current_cpu_data.flags & CPU_HAS_DSP) || (regs->sr & SR_DSP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | return 0; |
| 625 | |
| 626 | get_user(inst, ((unsigned short *) regs->pc)); |
| 627 | |
| 628 | inst &= 0xf000; |
| 629 | |
| 630 | /* Check for any type of DSP or support instruction */ |
| 631 | if ((inst == 0xf000) || (inst == 0x4000)) |
| 632 | return 1; |
| 633 | |
| 634 | return 0; |
| 635 | } |
| 636 | #else |
| 637 | #define is_dsp_inst(regs) (0) |
| 638 | #endif /* CONFIG_SH_DSP */ |
| 639 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 640 | #ifdef CONFIG_CPU_SH2A |
| 641 | asmlinkage void do_divide_error(unsigned long r4, unsigned long r5, |
| 642 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 643 | struct pt_regs __regs) |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 644 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 645 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 646 | siginfo_t info; |
| 647 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 648 | switch (r4) { |
| 649 | case TRAP_DIVZERO_ERROR: |
| 650 | info.si_code = FPE_INTDIV; |
| 651 | break; |
| 652 | case TRAP_DIVOVF_ERROR: |
| 653 | info.si_code = FPE_INTOVF; |
| 654 | break; |
| 655 | } |
| 656 | |
| 657 | force_sig_info(SIGFPE, &info, current); |
| 658 | } |
| 659 | #endif |
| 660 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 661 | /* arch/sh/kernel/cpu/sh4/fpu.c */ |
| 662 | extern int do_fpu_inst(unsigned short, struct pt_regs *); |
| 663 | extern asmlinkage void do_fpu_state_restore(unsigned long r4, unsigned long r5, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 664 | unsigned long r6, unsigned long r7, struct pt_regs __regs); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 665 | |
| 666 | asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5, |
| 667 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 668 | struct pt_regs __regs) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 669 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 670 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 671 | unsigned long error_code; |
| 672 | struct task_struct *tsk = current; |
| 673 | |
| 674 | #ifdef CONFIG_SH_FPU_EMU |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 675 | unsigned short inst = 0; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 676 | int err; |
| 677 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 678 | get_user(inst, (unsigned short*)regs->pc); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 679 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 680 | err = do_fpu_inst(inst, regs); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 681 | if (!err) { |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 682 | regs->pc += instruction_size(inst); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 683 | return; |
| 684 | } |
| 685 | /* not a FPU inst. */ |
| 686 | #endif |
| 687 | |
| 688 | #ifdef CONFIG_SH_DSP |
| 689 | /* Check if it's a DSP instruction */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 690 | if (is_dsp_inst(regs)) { |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 691 | /* Enable DSP mode, and restart instruction. */ |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 692 | regs->sr |= SR_DSP; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 693 | return; |
| 694 | } |
| 695 | #endif |
| 696 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 697 | lookup_exception_vector(error_code); |
| 698 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 699 | local_irq_enable(); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 700 | CHK_REMOTE_DEBUG(regs); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 701 | force_sig(SIGILL, tsk); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 702 | die_if_no_fixup("reserved instruction", regs, error_code); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | #ifdef CONFIG_SH_FPU_EMU |
| 706 | static int emulate_branch(unsigned short inst, struct pt_regs* regs) |
| 707 | { |
| 708 | /* |
| 709 | * bfs: 8fxx: PC+=d*2+4; |
| 710 | * bts: 8dxx: PC+=d*2+4; |
| 711 | * bra: axxx: PC+=D*2+4; |
| 712 | * bsr: bxxx: PC+=D*2+4 after PR=PC+4; |
| 713 | * braf:0x23: PC+=Rn*2+4; |
| 714 | * bsrf:0x03: PC+=Rn*2+4 after PR=PC+4; |
| 715 | * jmp: 4x2b: PC=Rn; |
| 716 | * jsr: 4x0b: PC=Rn after PR=PC+4; |
| 717 | * rts: 000b: PC=PR; |
| 718 | */ |
| 719 | if ((inst & 0xfd00) == 0x8d00) { |
| 720 | regs->pc += SH_PC_8BIT_OFFSET(inst); |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | if ((inst & 0xe000) == 0xa000) { |
| 725 | regs->pc += SH_PC_12BIT_OFFSET(inst); |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | if ((inst & 0xf0df) == 0x0003) { |
| 730 | regs->pc += regs->regs[(inst & 0x0f00) >> 8] + 4; |
| 731 | return 0; |
| 732 | } |
| 733 | |
| 734 | if ((inst & 0xf0df) == 0x400b) { |
| 735 | regs->pc = regs->regs[(inst & 0x0f00) >> 8]; |
| 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | if ((inst & 0xffff) == 0x000b) { |
| 740 | regs->pc = regs->pr; |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | return 1; |
| 745 | } |
| 746 | #endif |
| 747 | |
| 748 | asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5, |
| 749 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 750 | struct pt_regs __regs) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 751 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 752 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 753 | unsigned long error_code; |
| 754 | struct task_struct *tsk = current; |
| 755 | #ifdef CONFIG_SH_FPU_EMU |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 756 | unsigned short inst = 0; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 757 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 758 | get_user(inst, (unsigned short *)regs->pc + 1); |
| 759 | if (!do_fpu_inst(inst, regs)) { |
| 760 | get_user(inst, (unsigned short *)regs->pc); |
| 761 | if (!emulate_branch(inst, regs)) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 762 | return; |
| 763 | /* fault in branch.*/ |
| 764 | } |
| 765 | /* not a FPU inst. */ |
| 766 | #endif |
| 767 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 768 | lookup_exception_vector(error_code); |
| 769 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 770 | local_irq_enable(); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 771 | CHK_REMOTE_DEBUG(regs); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 772 | force_sig(SIGILL, tsk); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 773 | die_if_no_fixup("illegal slot instruction", regs, error_code); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 774 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
| 776 | asmlinkage void do_exception_error(unsigned long r4, unsigned long r5, |
| 777 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 778 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 780 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | long ex; |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 782 | |
| 783 | lookup_exception_vector(ex); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 784 | die_if_kernel("exception", regs, ex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | #if defined(CONFIG_SH_STANDARD_BIOS) |
| 788 | void *gdb_vbr_vector; |
| 789 | |
| 790 | static inline void __init gdb_vbr_init(void) |
| 791 | { |
| 792 | register unsigned long vbr; |
| 793 | |
| 794 | /* |
| 795 | * Read the old value of the VBR register to initialise |
| 796 | * the vector through which debug and BIOS traps are |
| 797 | * delegated by the Linux trap handler. |
| 798 | */ |
| 799 | asm volatile("stc vbr, %0" : "=r" (vbr)); |
| 800 | |
| 801 | gdb_vbr_vector = (void *)(vbr + 0x100); |
| 802 | printk("Setting GDB trap vector to 0x%08lx\n", |
| 803 | (unsigned long)gdb_vbr_vector); |
| 804 | } |
| 805 | #endif |
| 806 | |
| 807 | void __init per_cpu_trap_init(void) |
| 808 | { |
| 809 | extern void *vbr_base; |
| 810 | |
| 811 | #ifdef CONFIG_SH_STANDARD_BIOS |
| 812 | gdb_vbr_init(); |
| 813 | #endif |
| 814 | |
| 815 | /* NOTE: The VBR value should be at P1 |
| 816 | (or P2, virtural "fixed" address space). |
| 817 | It's definitely should not in physical address. */ |
| 818 | |
| 819 | asm volatile("ldc %0, vbr" |
| 820 | : /* no output */ |
| 821 | : "r" (&vbr_base) |
| 822 | : "memory"); |
| 823 | } |
| 824 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 825 | void *set_exception_table_vec(unsigned int vec, void *handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | { |
| 827 | extern void *exception_handling_table[]; |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 828 | void *old_handler; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 829 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 830 | old_handler = exception_handling_table[vec]; |
| 831 | exception_handling_table[vec] = handler; |
| 832 | return old_handler; |
| 833 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 835 | extern asmlinkage void address_error_handler(unsigned long r4, unsigned long r5, |
| 836 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 837 | struct pt_regs __regs); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 838 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 839 | void __init trap_init(void) |
| 840 | { |
| 841 | set_exception_table_vec(TRAP_RESERVED_INST, do_reserved_inst); |
| 842 | set_exception_table_vec(TRAP_ILLEGAL_SLOT_INST, do_illegal_slot_inst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 844 | #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_FPU) || \ |
| 845 | defined(CONFIG_SH_FPU_EMU) |
| 846 | /* |
| 847 | * For SH-4 lacking an FPU, treat floating point instructions as |
| 848 | * reserved. They'll be handled in the math-emu case, or faulted on |
| 849 | * otherwise. |
| 850 | */ |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 851 | set_exception_table_evt(0x800, do_reserved_inst); |
| 852 | set_exception_table_evt(0x820, do_illegal_slot_inst); |
| 853 | #elif defined(CONFIG_SH_FPU) |
| 854 | set_exception_table_evt(0x800, do_fpu_state_restore); |
| 855 | set_exception_table_evt(0x820, do_fpu_state_restore); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | #endif |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 857 | |
| 858 | #ifdef CONFIG_CPU_SH2 |
| 859 | set_exception_table_vec(TRAP_ADDRESS_ERROR, address_error_handler); |
| 860 | #endif |
| 861 | #ifdef CONFIG_CPU_SH2A |
| 862 | set_exception_table_vec(TRAP_DIVZERO_ERROR, do_divide_error); |
| 863 | set_exception_table_vec(TRAP_DIVOVF_ERROR, do_divide_error); |
| 864 | #endif |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | /* Setup VBR for boot cpu */ |
| 867 | per_cpu_trap_init(); |
| 868 | } |
| 869 | |
Paul Mundt | fa69151 | 2007-03-08 19:41:21 +0900 | [diff] [blame] | 870 | #ifdef CONFIG_BUG |
| 871 | void handle_BUG(struct pt_regs *regs) |
| 872 | { |
| 873 | enum bug_trap_type tt; |
| 874 | tt = report_bug(regs->pc); |
| 875 | if (tt == BUG_TRAP_TYPE_WARN) { |
| 876 | regs->pc += 2; |
| 877 | return; |
| 878 | } |
| 879 | |
| 880 | die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff); |
| 881 | } |
| 882 | |
| 883 | int is_valid_bugaddr(unsigned long addr) |
| 884 | { |
| 885 | return addr >= PAGE_OFFSET; |
| 886 | } |
| 887 | #endif |
| 888 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 889 | void show_trace(struct task_struct *tsk, unsigned long *sp, |
| 890 | struct pt_regs *regs) |
| 891 | { |
| 892 | unsigned long addr; |
| 893 | |
| 894 | if (regs && user_mode(regs)) |
| 895 | return; |
| 896 | |
| 897 | printk("\nCall trace: "); |
| 898 | #ifdef CONFIG_KALLSYMS |
| 899 | printk("\n"); |
| 900 | #endif |
| 901 | |
| 902 | while (!kstack_end(sp)) { |
| 903 | addr = *sp++; |
| 904 | if (kernel_text_address(addr)) |
| 905 | print_ip_sym(addr); |
| 906 | } |
| 907 | |
| 908 | printk("\n"); |
Paul Mundt | 9b8c90e | 2006-12-06 11:07:51 +0900 | [diff] [blame] | 909 | |
| 910 | if (!tsk) |
| 911 | tsk = current; |
| 912 | |
| 913 | debug_show_held_locks(tsk); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 914 | } |
| 915 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | void show_stack(struct task_struct *tsk, unsigned long *sp) |
| 917 | { |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 918 | unsigned long stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Paul Mundt | a6a31139 | 2006-09-27 18:22:14 +0900 | [diff] [blame] | 920 | if (!tsk) |
| 921 | tsk = current; |
| 922 | if (tsk == current) |
| 923 | sp = (unsigned long *)current_stack_pointer; |
| 924 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | sp = (unsigned long *)tsk->thread.sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 927 | stack = (unsigned long)sp; |
| 928 | dump_mem("Stack: ", stack, THREAD_SIZE + |
| 929 | (unsigned long)task_stack_page(tsk)); |
| 930 | show_trace(tsk, sp, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |
| 932 | |
| 933 | void dump_stack(void) |
| 934 | { |
| 935 | show_stack(NULL, NULL); |
| 936 | } |
| 937 | EXPORT_SYMBOL(dump_stack); |