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 | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 8 | * Copyright (C) 2002 - 2010 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> |
Russell King | ba84be2 | 2009-01-06 14:41:07 -0800 | [diff] [blame] | 16 | #include <linux/hardirq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/kallsyms.h> |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 21 | #include <linux/io.h> |
Paul Mundt | fa69151 | 2007-03-08 19:41:21 +0900 | [diff] [blame] | 22 | #include <linux/bug.h> |
Paul Mundt | 9b8c90e | 2006-12-06 11:07:51 +0900 | [diff] [blame] | 23 | #include <linux/debug_locks.h> |
Paul Mundt | b118ca5 | 2007-05-09 10:55:38 +0900 | [diff] [blame] | 24 | #include <linux/kdebug.h> |
Paul Mundt | e113276 | 2007-05-15 08:36:36 +0900 | [diff] [blame] | 25 | #include <linux/kexec.h> |
Paul Mundt | dc34d31 | 2006-12-08 17:41:43 +0900 | [diff] [blame] | 26 | #include <linux/limits.h> |
Paul Mundt | af67c3a | 2009-10-13 10:57:52 +0900 | [diff] [blame] | 27 | #include <linux/sysfs.h> |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 28 | #include <linux/uaccess.h> |
Paul Mundt | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 29 | #include <linux/perf_event.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/system.h> |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 31 | #include <asm/alignment.h> |
Andrew Morton | fad0f90 | 2008-04-16 02:03:51 +0900 | [diff] [blame] | 32 | #include <asm/fpu.h> |
Chris Smith | d39f545 | 2008-09-05 17:15:39 +0900 | [diff] [blame] | 33 | #include <asm/kprobes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #ifdef CONFIG_CPU_SH2 |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 36 | # define TRAP_RESERVED_INST 4 |
| 37 | # define TRAP_ILLEGAL_SLOT_INST 6 |
| 38 | # define TRAP_ADDRESS_ERROR 9 |
| 39 | # ifdef CONFIG_CPU_SH2A |
Peter Griffin | cd89436 | 2009-05-08 15:51:51 +0100 | [diff] [blame] | 40 | # define TRAP_UBC 12 |
Yoshinori Sato | 6e80f5e | 2008-07-10 01:20:03 +0900 | [diff] [blame] | 41 | # define TRAP_FPU_ERROR 13 |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 42 | # define TRAP_DIVZERO_ERROR 17 |
| 43 | # define TRAP_DIVOVF_ERROR 18 |
| 44 | # endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #else |
| 46 | #define TRAP_RESERVED_INST 12 |
| 47 | #define TRAP_ILLEGAL_SLOT_INST 13 |
| 48 | #endif |
| 49 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 50 | static void dump_mem(const char *str, unsigned long bottom, unsigned long top) |
| 51 | { |
| 52 | unsigned long p; |
| 53 | int i; |
| 54 | |
| 55 | printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top); |
| 56 | |
| 57 | for (p = bottom & ~31; p < top; ) { |
| 58 | printk("%04lx: ", p & 0xffff); |
| 59 | |
| 60 | for (i = 0; i < 8; i++, p += 4) { |
| 61 | unsigned int val; |
| 62 | |
| 63 | if (p < bottom || p >= top) |
| 64 | printk(" "); |
| 65 | else { |
| 66 | if (__get_user(val, (unsigned int __user *)p)) { |
| 67 | printk("\n"); |
| 68 | return; |
| 69 | } |
| 70 | printk("%08x ", val); |
| 71 | } |
| 72 | } |
| 73 | printk("\n"); |
| 74 | } |
| 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Paul Mundt | 3a2e117 | 2007-05-01 16:33:10 +0900 | [diff] [blame] | 77 | static DEFINE_SPINLOCK(die_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | void die(const char * str, struct pt_regs * regs, long err) |
| 80 | { |
| 81 | static int die_counter; |
| 82 | |
Paul Mundt | 5527398 | 2007-06-18 18:57:13 +0900 | [diff] [blame] | 83 | oops_enter(); |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | spin_lock_irq(&die_lock); |
Paul Mundt | af67c3a | 2009-10-13 10:57:52 +0900 | [diff] [blame] | 86 | console_verbose(); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 87 | bust_spinlocks(1); |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); |
Paul Mundt | af67c3a | 2009-10-13 10:57:52 +0900 | [diff] [blame] | 90 | sysfs_printk_last_file(); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 91 | print_modules(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | show_regs(regs); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 93 | |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 94 | printk("Process: %s (pid: %d, stack limit = %p)\n", current->comm, |
| 95 | task_pid_nr(current), task_stack_page(current) + 1); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 96 | |
| 97 | if (!user_mode(regs) || in_interrupt()) |
| 98 | dump_mem("Stack: ", regs->regs[15], THREAD_SIZE + |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 99 | (unsigned long)task_stack_page(current)); |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 100 | |
Paul Mundt | c9306f0 | 2008-10-21 18:33:36 +0900 | [diff] [blame] | 101 | notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV); |
| 102 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 103 | bust_spinlocks(0); |
Pavel Emelianov | bcdcd8e | 2007-07-17 04:03:42 -0700 | [diff] [blame] | 104 | add_taint(TAINT_DIE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | spin_unlock_irq(&die_lock); |
Paul Mundt | af67c3a | 2009-10-13 10:57:52 +0900 | [diff] [blame] | 106 | oops_exit(); |
Paul Mundt | e113276 | 2007-05-15 08:36:36 +0900 | [diff] [blame] | 107 | |
| 108 | if (kexec_should_crash(current)) |
| 109 | crash_kexec(regs); |
| 110 | |
| 111 | if (in_interrupt()) |
| 112 | panic("Fatal exception in interrupt"); |
| 113 | |
| 114 | if (panic_on_oops) |
| 115 | panic("Fatal exception"); |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | do_exit(SIGSEGV); |
| 118 | } |
| 119 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 120 | static inline void die_if_kernel(const char *str, struct pt_regs *regs, |
| 121 | long err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
| 123 | if (!user_mode(regs)) |
| 124 | die(str, regs, err); |
| 125 | } |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | /* |
| 128 | * try and fix up kernelspace address errors |
| 129 | * - userspace errors just cause EFAULT to be returned, resulting in SEGV |
| 130 | * - kernel/userspace interfaces cause a jump to an appropriate handler |
| 131 | * - other kernel errors are bad |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | */ |
SUGIOKA Toshinobu | 2afb447 | 2009-01-21 09:42:10 +0900 | [diff] [blame] | 133 | static void die_if_no_fixup(const char * str, struct pt_regs * regs, long err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 135 | if (!user_mode(regs)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | const struct exception_table_entry *fixup; |
| 137 | fixup = search_exception_tables(regs->pc); |
| 138 | if (fixup) { |
| 139 | regs->pc = fixup->fixup; |
SUGIOKA Toshinobu | 2afb447 | 2009-01-21 09:42:10 +0900 | [diff] [blame] | 140 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
Matt Fleming | b344e24a | 2009-08-16 21:54:48 +0100 | [diff] [blame] | 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | die(str, regs, err); |
| 144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 147 | static inline void sign_extend(unsigned int count, unsigned char *dst) |
| 148 | { |
| 149 | #ifdef __LITTLE_ENDIAN__ |
Magnus Damm | 4252c65 | 2008-02-07 19:58:46 +0900 | [diff] [blame] | 150 | if ((count == 1) && dst[0] & 0x80) { |
| 151 | dst[1] = 0xff; |
| 152 | dst[2] = 0xff; |
| 153 | dst[3] = 0xff; |
| 154 | } |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 155 | if ((count == 2) && dst[1] & 0x80) { |
| 156 | dst[2] = 0xff; |
| 157 | dst[3] = 0xff; |
| 158 | } |
| 159 | #else |
Magnus Damm | 4252c65 | 2008-02-07 19:58:46 +0900 | [diff] [blame] | 160 | if ((count == 1) && dst[3] & 0x80) { |
| 161 | dst[2] = 0xff; |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 162 | dst[1] = 0xff; |
Magnus Damm | 4252c65 | 2008-02-07 19:58:46 +0900 | [diff] [blame] | 163 | dst[0] = 0xff; |
| 164 | } |
| 165 | if ((count == 2) && dst[2] & 0x80) { |
| 166 | dst[1] = 0xff; |
| 167 | dst[0] = 0xff; |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 168 | } |
| 169 | #endif |
| 170 | } |
| 171 | |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 172 | static struct mem_access user_mem_access = { |
| 173 | copy_from_user, |
| 174 | copy_to_user, |
| 175 | }; |
| 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | /* |
| 178 | * handle an instruction that does an unaligned memory access by emulating the |
| 179 | * desired behaviour |
| 180 | * - note that PC _may not_ point to the faulting instruction |
| 181 | * (if that instruction is in a branch delay slot) |
| 182 | * - return 0 if emulation okay, -EFAULT on existential error |
| 183 | */ |
Paul Mundt | 2bcfffa | 2009-05-09 16:02:08 +0900 | [diff] [blame] | 184 | static int handle_unaligned_ins(insn_size_t instruction, struct pt_regs *regs, |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 185 | struct mem_access *ma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | { |
| 187 | int ret, index, count; |
| 188 | unsigned long *rm, *rn; |
| 189 | unsigned char *src, *dst; |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 190 | unsigned char __user *srcu, *dstu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | index = (instruction>>8)&15; /* 0x0F00 */ |
| 193 | rn = ®s->regs[index]; |
| 194 | |
| 195 | index = (instruction>>4)&15; /* 0x00F0 */ |
| 196 | rm = ®s->regs[index]; |
| 197 | |
| 198 | count = 1<<(instruction&3); |
| 199 | |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 200 | switch (count) { |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 201 | case 1: inc_unaligned_byte_access(); break; |
| 202 | case 2: inc_unaligned_word_access(); break; |
| 203 | case 4: inc_unaligned_dword_access(); break; |
| 204 | case 8: inc_unaligned_multi_access(); break; |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 205 | } |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | ret = -EFAULT; |
| 208 | switch (instruction>>12) { |
| 209 | case 0: /* mov.[bwl] to/from memory via r0+rn */ |
| 210 | if (instruction & 8) { |
| 211 | /* from memory */ |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 212 | srcu = (unsigned char __user *)*rm; |
| 213 | srcu += regs->regs[0]; |
| 214 | dst = (unsigned char *)rn; |
| 215 | *(unsigned long *)dst = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 217 | #if !defined(__LITTLE_ENDIAN__) |
| 218 | dst += 4-count; |
| 219 | #endif |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 220 | if (ma->from(dst, srcu, count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | goto fetch_fault; |
| 222 | |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 223 | sign_extend(count, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } else { |
| 225 | /* to memory */ |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 226 | src = (unsigned char *)rm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | #if !defined(__LITTLE_ENDIAN__) |
| 228 | src += 4-count; |
| 229 | #endif |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 230 | dstu = (unsigned char __user *)*rn; |
| 231 | dstu += regs->regs[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 233 | if (ma->to(dstu, src, count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | goto fetch_fault; |
| 235 | } |
| 236 | ret = 0; |
| 237 | break; |
| 238 | |
| 239 | case 1: /* mov.l Rm,@(disp,Rn) */ |
| 240 | src = (unsigned char*) rm; |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 241 | dstu = (unsigned char __user *)*rn; |
| 242 | dstu += (instruction&0x000F)<<2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 244 | if (ma->to(dstu, src, 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | goto fetch_fault; |
| 246 | ret = 0; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 247 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | case 2: /* mov.[bwl] to memory, possibly with pre-decrement */ |
| 250 | if (instruction & 4) |
| 251 | *rn -= count; |
| 252 | src = (unsigned char*) rm; |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 253 | dstu = (unsigned char __user *)*rn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | #if !defined(__LITTLE_ENDIAN__) |
| 255 | src += 4-count; |
| 256 | #endif |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 257 | if (ma->to(dstu, src, count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | goto fetch_fault; |
| 259 | ret = 0; |
| 260 | break; |
| 261 | |
| 262 | case 5: /* mov.l @(disp,Rm),Rn */ |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 263 | srcu = (unsigned char __user *)*rm; |
| 264 | srcu += (instruction & 0x000F) << 2; |
| 265 | dst = (unsigned char *)rn; |
| 266 | *(unsigned long *)dst = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 268 | if (ma->from(dst, srcu, 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | goto fetch_fault; |
| 270 | ret = 0; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 271 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | case 6: /* mov.[bwl] from memory, possibly with post-increment */ |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 274 | srcu = (unsigned char __user *)*rm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | if (instruction & 4) |
| 276 | *rm += count; |
| 277 | dst = (unsigned char*) rn; |
| 278 | *(unsigned long*)dst = 0; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 279 | |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 280 | #if !defined(__LITTLE_ENDIAN__) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | dst += 4-count; |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 282 | #endif |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 283 | if (ma->from(dst, srcu, count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | goto fetch_fault; |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 285 | sign_extend(count, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | ret = 0; |
| 287 | break; |
| 288 | |
| 289 | case 8: |
| 290 | switch ((instruction&0xFF00)>>8) { |
| 291 | case 0x81: /* mov.w R0,@(disp,Rn) */ |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 292 | src = (unsigned char *) ®s->regs[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | #if !defined(__LITTLE_ENDIAN__) |
| 294 | src += 2; |
| 295 | #endif |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 296 | dstu = (unsigned char __user *)*rm; /* called Rn in the spec */ |
| 297 | dstu += (instruction & 0x000F) << 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 299 | if (ma->to(dstu, src, 2)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | goto fetch_fault; |
| 301 | ret = 0; |
| 302 | break; |
| 303 | |
| 304 | case 0x85: /* mov.w @(disp,Rm),R0 */ |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 305 | srcu = (unsigned char __user *)*rm; |
| 306 | srcu += (instruction & 0x000F) << 1; |
| 307 | dst = (unsigned char *) ®s->regs[0]; |
| 308 | *(unsigned long *)dst = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | #if !defined(__LITTLE_ENDIAN__) |
| 311 | dst += 2; |
| 312 | #endif |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 313 | if (ma->from(dst, srcu, 2)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | goto fetch_fault; |
Magnus Damm | 86c0179 | 2008-02-07 00:02:50 +0900 | [diff] [blame] | 315 | sign_extend(2, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | ret = 0; |
| 317 | break; |
| 318 | } |
| 319 | break; |
| 320 | } |
| 321 | return ret; |
| 322 | |
| 323 | fetch_fault: |
| 324 | /* Argh. Address not only misaligned but also non-existent. |
| 325 | * Raise an EFAULT and see if it's trapped |
| 326 | */ |
SUGIOKA Toshinobu | 2afb447 | 2009-01-21 09:42:10 +0900 | [diff] [blame] | 327 | die_if_no_fixup("Fault in unaligned fixup", regs, 0); |
| 328 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | /* |
| 332 | * emulate the instruction in the delay slot |
| 333 | * - fetches the instruction from PC+2 |
| 334 | */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 335 | static inline int handle_delayslot(struct pt_regs *regs, |
Paul Mundt | 2bcfffa | 2009-05-09 16:02:08 +0900 | [diff] [blame] | 336 | insn_size_t old_instruction, |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 337 | struct mem_access *ma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
Paul Mundt | 2bcfffa | 2009-05-09 16:02:08 +0900 | [diff] [blame] | 339 | insn_size_t instruction; |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 340 | void __user *addr = (void __user *)(regs->pc + |
| 341 | instruction_size(old_instruction)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Magnus Damm | 4b5a9ef | 2008-02-07 20:04:12 +0900 | [diff] [blame] | 343 | if (copy_from_user(&instruction, addr, sizeof(instruction))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | /* the instruction-fetch faulted */ |
| 345 | if (user_mode(regs)) |
| 346 | return -EFAULT; |
| 347 | |
| 348 | /* kernel */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 349 | die("delay-slot-insn faulting in handle_unaligned_delayslot", |
| 350 | regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
| 352 | |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 353 | return handle_unaligned_ins(instruction, regs, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | /* |
| 357 | * handle an instruction that does an unaligned memory access |
| 358 | * - have to be careful of branch delay-slot instructions that fault |
| 359 | * SH3: |
| 360 | * - if the branch would be taken PC points to the branch |
| 361 | * - if the branch would not be taken, PC points to delay-slot |
| 362 | * SH4: |
| 363 | * - PC always points to delayed branch |
| 364 | * - return 0 if handled, -EFAULT if failed (may not return if in kernel) |
| 365 | */ |
| 366 | |
| 367 | /* Macros to determine offset from current PC for branch instructions */ |
| 368 | /* Explicit type coercion is used to force sign extension where needed */ |
| 369 | #define SH_PC_8BIT_OFFSET(instr) ((((signed char)(instr))*2) + 4) |
| 370 | #define SH_PC_12BIT_OFFSET(instr) ((((signed short)(instr<<4))>>3) + 4) |
| 371 | |
Paul Mundt | 2bcfffa | 2009-05-09 16:02:08 +0900 | [diff] [blame] | 372 | int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, |
Paul Mundt | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 373 | struct mem_access *ma, int expected, |
| 374 | unsigned long address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
| 376 | u_int rm; |
| 377 | int ret, index; |
| 378 | |
Paul Mundt | 23c4c82 | 2009-09-24 17:38:18 +0900 | [diff] [blame] | 379 | /* |
| 380 | * XXX: We can't handle mixed 16/32-bit instructions yet |
| 381 | */ |
| 382 | if (instruction_size(instruction) != 2) |
| 383 | return -EINVAL; |
| 384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | index = (instruction>>8)&15; /* 0x0F00 */ |
| 386 | rm = regs->regs[index]; |
| 387 | |
Paul Mundt | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 388 | /* |
| 389 | * Log the unexpected fixups, and then pass them on to perf. |
| 390 | * |
| 391 | * We intentionally don't report the expected cases to perf as |
| 392 | * otherwise the trapped I/O case will skew the results too much |
| 393 | * to be useful. |
| 394 | */ |
| 395 | if (!expected) { |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 396 | unaligned_fixups_notify(current, instruction, regs); |
Paul Mundt | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 397 | perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, |
| 398 | regs, address); |
| 399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | ret = -EFAULT; |
| 402 | switch (instruction&0xF000) { |
| 403 | case 0x0000: |
| 404 | if (instruction==0x000B) { |
| 405 | /* rts */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 406 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (ret==0) |
| 408 | regs->pc = regs->pr; |
| 409 | } |
| 410 | else if ((instruction&0x00FF)==0x0023) { |
| 411 | /* braf @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 412 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (ret==0) |
| 414 | regs->pc += rm + 4; |
| 415 | } |
| 416 | else if ((instruction&0x00FF)==0x0003) { |
| 417 | /* bsrf @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 418 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (ret==0) { |
| 420 | regs->pr = regs->pc + 4; |
| 421 | regs->pc += rm + 4; |
| 422 | } |
| 423 | } |
| 424 | else { |
| 425 | /* mov.[bwl] to/from memory via r0+rn */ |
| 426 | goto simple; |
| 427 | } |
| 428 | break; |
| 429 | |
| 430 | case 0x1000: /* mov.l Rm,@(disp,Rn) */ |
| 431 | goto simple; |
| 432 | |
| 433 | case 0x2000: /* mov.[bwl] to memory, possibly with pre-decrement */ |
| 434 | goto simple; |
| 435 | |
| 436 | case 0x4000: |
| 437 | if ((instruction&0x00FF)==0x002B) { |
| 438 | /* jmp @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 439 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | if (ret==0) |
| 441 | regs->pc = rm; |
| 442 | } |
| 443 | else if ((instruction&0x00FF)==0x000B) { |
| 444 | /* jsr @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 445 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | if (ret==0) { |
| 447 | regs->pr = regs->pc + 4; |
| 448 | regs->pc = rm; |
| 449 | } |
| 450 | } |
| 451 | else { |
| 452 | /* mov.[bwl] to/from memory via r0+rn */ |
| 453 | goto simple; |
| 454 | } |
| 455 | break; |
| 456 | |
| 457 | case 0x5000: /* mov.l @(disp,Rm),Rn */ |
| 458 | goto simple; |
| 459 | |
| 460 | case 0x6000: /* mov.[bwl] from memory, possibly with post-increment */ |
| 461 | goto simple; |
| 462 | |
| 463 | case 0x8000: /* bf lab, bf/s lab, bt lab, bt/s lab */ |
| 464 | switch (instruction&0x0F00) { |
| 465 | case 0x0100: /* mov.w R0,@(disp,Rm) */ |
| 466 | goto simple; |
| 467 | case 0x0500: /* mov.w @(disp,Rm),R0 */ |
| 468 | goto simple; |
| 469 | case 0x0B00: /* bf lab - no delayslot*/ |
| 470 | break; |
| 471 | case 0x0F00: /* bf/s lab */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 472 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | case 0x0900: /* bt lab - no delayslot */ |
| 483 | break; |
| 484 | case 0x0D00: /* bt/s lab */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 485 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | if (ret==0) { |
| 487 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) |
| 488 | if ((regs->sr & 0x00000001) == 0) |
| 489 | regs->pc += 4; /* next after slot */ |
| 490 | else |
| 491 | #endif |
| 492 | regs->pc += SH_PC_8BIT_OFFSET(instruction); |
| 493 | } |
| 494 | break; |
| 495 | } |
| 496 | break; |
| 497 | |
| 498 | case 0xA000: /* bra label */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 499 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | if (ret==0) |
| 501 | regs->pc += SH_PC_12BIT_OFFSET(instruction); |
| 502 | break; |
| 503 | |
| 504 | case 0xB000: /* bsr label */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 505 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | if (ret==0) { |
| 507 | regs->pr = regs->pc + 4; |
| 508 | regs->pc += SH_PC_12BIT_OFFSET(instruction); |
| 509 | } |
| 510 | break; |
| 511 | } |
| 512 | return ret; |
| 513 | |
| 514 | /* handle non-delay-slot instruction */ |
| 515 | simple: |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 516 | ret = handle_unaligned_ins(instruction, regs, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | if (ret==0) |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 518 | regs->pc += instruction_size(instruction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | return ret; |
| 520 | } |
| 521 | |
| 522 | /* |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 523 | * Handle various address error exceptions: |
| 524 | * - instruction address error: |
| 525 | * misaligned PC |
| 526 | * PC >= 0x80000000 in user mode |
| 527 | * - data address error (read and write) |
| 528 | * misaligned data access |
| 529 | * access to >= 0x80000000 is user mode |
| 530 | * Unfortuntaly we can't distinguish between instruction address error |
Simon Arlott | e868d61 | 2007-05-14 08:15:10 +0900 | [diff] [blame] | 531 | * and data address errors caused by read accesses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | */ |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 533 | asmlinkage void do_address_error(struct pt_regs *regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | unsigned long writeaccess, |
| 535 | unsigned long address) |
| 536 | { |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 537 | unsigned long error_code = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | mm_segment_t oldfs; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 539 | siginfo_t info; |
Paul Mundt | 2bcfffa | 2009-05-09 16:02:08 +0900 | [diff] [blame] | 540 | insn_size_t instruction; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | int tmp; |
| 542 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 543 | /* Intentional ifdef */ |
| 544 | #ifdef CONFIG_CPU_HAS_SR_RB |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 545 | error_code = lookup_exception_vector(); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 546 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
| 548 | oldfs = get_fs(); |
| 549 | |
| 550 | if (user_mode(regs)) { |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 551 | int si_code = BUS_ADRERR; |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 552 | unsigned int user_action; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | local_irq_enable(); |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 555 | inc_unaligned_user_access(); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 556 | |
Andre Draszik | 5a0ab35 | 2009-08-24 15:01:10 +0900 | [diff] [blame] | 557 | set_fs(USER_DS); |
Paul Mundt | 23c4c82 | 2009-09-24 17:38:18 +0900 | [diff] [blame] | 558 | if (copy_from_user(&instruction, (insn_size_t *)(regs->pc & ~1), |
| 559 | sizeof(instruction))) { |
Andre Draszik | 5a0ab35 | 2009-08-24 15:01:10 +0900 | [diff] [blame] | 560 | set_fs(oldfs); |
| 561 | goto uspace_segv; |
| 562 | } |
| 563 | set_fs(oldfs); |
| 564 | |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 565 | /* shout about userspace fixups */ |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 566 | unaligned_fixups_notify(current, instruction, regs); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 567 | |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 568 | user_action = unaligned_user_action(); |
| 569 | if (user_action & UM_FIXUP) |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 570 | goto fixup; |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 571 | if (user_action & UM_SIGNAL) |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 572 | goto uspace_segv; |
| 573 | else { |
| 574 | /* ignore */ |
Andre Draszik | 5a0ab35 | 2009-08-24 15:01:10 +0900 | [diff] [blame] | 575 | regs->pc += instruction_size(instruction); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 576 | return; |
| 577 | } |
| 578 | |
| 579 | fixup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | /* bad PC is not something we can fix */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 581 | if (regs->pc & 1) { |
| 582 | si_code = BUS_ADRALN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | goto uspace_segv; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 584 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | set_fs(USER_DS); |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 587 | tmp = handle_unaligned_access(instruction, regs, |
Paul Mundt | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 588 | &user_mem_access, 0, |
| 589 | address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | set_fs(oldfs); |
| 591 | |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 592 | if (tmp == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | return; /* sorted */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 594 | uspace_segv: |
| 595 | printk(KERN_NOTICE "Sending SIGBUS to \"%s\" due to unaligned " |
| 596 | "access (PC %lx PR %lx)\n", current->comm, regs->pc, |
| 597 | regs->pr); |
| 598 | |
| 599 | info.si_signo = SIGBUS; |
| 600 | info.si_errno = 0; |
| 601 | info.si_code = si_code; |
Paul Mundt | e08f457 | 2007-05-14 12:52:56 +0900 | [diff] [blame] | 602 | info.si_addr = (void __user *)address; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 603 | force_sig_info(SIGBUS, &info, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } else { |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 605 | inc_unaligned_kernel_access(); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | if (regs->pc & 1) |
| 608 | die("unaligned program counter", regs, error_code); |
| 609 | |
| 610 | set_fs(KERNEL_DS); |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 611 | if (copy_from_user(&instruction, (void __user *)(regs->pc), |
Magnus Damm | 4b5a9ef | 2008-02-07 20:04:12 +0900 | [diff] [blame] | 612 | sizeof(instruction))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /* Argh. Fault on the instruction itself. |
| 614 | This should never happen non-SMP |
| 615 | */ |
| 616 | set_fs(oldfs); |
| 617 | die("insn faulting in do_address_error", regs, 0); |
| 618 | } |
| 619 | |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame] | 620 | unaligned_fixups_notify(current, instruction, regs); |
Paul Mundt | 40258ee | 2009-09-24 17:48:15 +0900 | [diff] [blame] | 621 | |
Paul Mundt | ace2dc7 | 2010-10-13 06:55:26 +0900 | [diff] [blame^] | 622 | handle_unaligned_access(instruction, regs, &user_mem_access, |
| 623 | 0, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | set_fs(oldfs); |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | #ifdef CONFIG_SH_DSP |
| 629 | /* |
| 630 | * SH-DSP support gerg@snapgear.com. |
| 631 | */ |
| 632 | int is_dsp_inst(struct pt_regs *regs) |
| 633 | { |
Paul Mundt | 882c12c | 2007-05-14 17:26:34 +0900 | [diff] [blame] | 634 | unsigned short inst = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 636 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | * Safe guard if DSP mode is already enabled or we're lacking |
| 638 | * the DSP altogether. |
| 639 | */ |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 640 | if (!(current_cpu_data.flags & CPU_HAS_DSP) || (regs->sr & SR_DSP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | return 0; |
| 642 | |
| 643 | get_user(inst, ((unsigned short *) regs->pc)); |
| 644 | |
| 645 | inst &= 0xf000; |
| 646 | |
| 647 | /* Check for any type of DSP or support instruction */ |
| 648 | if ((inst == 0xf000) || (inst == 0x4000)) |
| 649 | return 1; |
| 650 | |
| 651 | return 0; |
| 652 | } |
| 653 | #else |
| 654 | #define is_dsp_inst(regs) (0) |
| 655 | #endif /* CONFIG_SH_DSP */ |
| 656 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 657 | #ifdef CONFIG_CPU_SH2A |
| 658 | asmlinkage void do_divide_error(unsigned long r4, unsigned long r5, |
| 659 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 660 | struct pt_regs __regs) |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 661 | { |
| 662 | siginfo_t info; |
| 663 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 664 | switch (r4) { |
| 665 | case TRAP_DIVZERO_ERROR: |
| 666 | info.si_code = FPE_INTDIV; |
| 667 | break; |
| 668 | case TRAP_DIVOVF_ERROR: |
| 669 | info.si_code = FPE_INTOVF; |
| 670 | break; |
| 671 | } |
| 672 | |
| 673 | force_sig_info(SIGFPE, &info, current); |
| 674 | } |
| 675 | #endif |
| 676 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 677 | asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5, |
| 678 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 679 | struct pt_regs __regs) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 680 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 681 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 682 | unsigned long error_code; |
| 683 | struct task_struct *tsk = current; |
| 684 | |
| 685 | #ifdef CONFIG_SH_FPU_EMU |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 686 | unsigned short inst = 0; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 687 | int err; |
| 688 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 689 | get_user(inst, (unsigned short*)regs->pc); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 690 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 691 | err = do_fpu_inst(inst, regs); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 692 | if (!err) { |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 693 | regs->pc += instruction_size(inst); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 694 | return; |
| 695 | } |
| 696 | /* not a FPU inst. */ |
| 697 | #endif |
| 698 | |
| 699 | #ifdef CONFIG_SH_DSP |
| 700 | /* Check if it's a DSP instruction */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 701 | if (is_dsp_inst(regs)) { |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 702 | /* Enable DSP mode, and restart instruction. */ |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 703 | regs->sr |= SR_DSP; |
Michael Trimarchi | 01ab103 | 2009-04-03 17:32:33 +0000 | [diff] [blame] | 704 | /* Save DSP mode */ |
| 705 | tsk->thread.dsp_status.status |= SR_DSP; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 706 | return; |
| 707 | } |
| 708 | #endif |
| 709 | |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 710 | error_code = lookup_exception_vector(); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 711 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 712 | local_irq_enable(); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 713 | force_sig(SIGILL, tsk); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 714 | die_if_no_fixup("reserved instruction", regs, error_code); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | #ifdef CONFIG_SH_FPU_EMU |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 718 | static int emulate_branch(unsigned short inst, struct pt_regs *regs) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 719 | { |
| 720 | /* |
| 721 | * bfs: 8fxx: PC+=d*2+4; |
| 722 | * bts: 8dxx: PC+=d*2+4; |
| 723 | * bra: axxx: PC+=D*2+4; |
| 724 | * bsr: bxxx: PC+=D*2+4 after PR=PC+4; |
| 725 | * braf:0x23: PC+=Rn*2+4; |
| 726 | * bsrf:0x03: PC+=Rn*2+4 after PR=PC+4; |
| 727 | * jmp: 4x2b: PC=Rn; |
| 728 | * jsr: 4x0b: PC=Rn after PR=PC+4; |
| 729 | * rts: 000b: PC=PR; |
| 730 | */ |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 731 | if (((inst & 0xf000) == 0xb000) || /* bsr */ |
| 732 | ((inst & 0xf0ff) == 0x0003) || /* bsrf */ |
| 733 | ((inst & 0xf0ff) == 0x400b)) /* jsr */ |
| 734 | regs->pr = regs->pc + 4; |
| 735 | |
| 736 | if ((inst & 0xfd00) == 0x8d00) { /* bfs, bts */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 737 | regs->pc += SH_PC_8BIT_OFFSET(inst); |
| 738 | return 0; |
| 739 | } |
| 740 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 741 | if ((inst & 0xe000) == 0xa000) { /* bra, bsr */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 742 | regs->pc += SH_PC_12BIT_OFFSET(inst); |
| 743 | return 0; |
| 744 | } |
| 745 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 746 | if ((inst & 0xf0df) == 0x0003) { /* braf, bsrf */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 747 | regs->pc += regs->regs[(inst & 0x0f00) >> 8] + 4; |
| 748 | return 0; |
| 749 | } |
| 750 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 751 | if ((inst & 0xf0df) == 0x400b) { /* jmp, jsr */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 752 | regs->pc = regs->regs[(inst & 0x0f00) >> 8]; |
| 753 | return 0; |
| 754 | } |
| 755 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 756 | if ((inst & 0xffff) == 0x000b) { /* rts */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 757 | regs->pc = regs->pr; |
| 758 | return 0; |
| 759 | } |
| 760 | |
| 761 | return 1; |
| 762 | } |
| 763 | #endif |
| 764 | |
| 765 | asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5, |
| 766 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 767 | struct pt_regs __regs) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 768 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 769 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Paul Mundt | b3d765f | 2008-09-17 23:12:11 +0900 | [diff] [blame] | 770 | unsigned long inst; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 771 | struct task_struct *tsk = current; |
Chris Smith | d39f545 | 2008-09-05 17:15:39 +0900 | [diff] [blame] | 772 | |
| 773 | if (kprobe_handle_illslot(regs->pc) == 0) |
| 774 | return; |
| 775 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 776 | #ifdef CONFIG_SH_FPU_EMU |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 777 | get_user(inst, (unsigned short *)regs->pc + 1); |
| 778 | if (!do_fpu_inst(inst, regs)) { |
| 779 | get_user(inst, (unsigned short *)regs->pc); |
| 780 | if (!emulate_branch(inst, regs)) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 781 | return; |
| 782 | /* fault in branch.*/ |
| 783 | } |
| 784 | /* not a FPU inst. */ |
| 785 | #endif |
| 786 | |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 787 | inst = lookup_exception_vector(); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 788 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 789 | local_irq_enable(); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 790 | force_sig(SIGILL, tsk); |
Paul Mundt | b3d765f | 2008-09-17 23:12:11 +0900 | [diff] [blame] | 791 | die_if_no_fixup("illegal slot instruction", regs, inst); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 792 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | asmlinkage void do_exception_error(unsigned long r4, unsigned long r5, |
| 795 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 796 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 798 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | long ex; |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 800 | |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 801 | ex = lookup_exception_vector(); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 802 | die_if_kernel("exception", regs, ex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | } |
| 804 | |
Paul Mundt | aba1030 | 2007-09-21 18:32:32 +0900 | [diff] [blame] | 805 | void __cpuinit per_cpu_trap_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | { |
| 807 | extern void *vbr_base; |
| 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | /* NOTE: The VBR value should be at P1 |
| 810 | (or P2, virtural "fixed" address space). |
| 811 | It's definitely should not in physical address. */ |
| 812 | |
| 813 | asm volatile("ldc %0, vbr" |
| 814 | : /* no output */ |
| 815 | : "r" (&vbr_base) |
| 816 | : "memory"); |
Magnus Damm | 68a1aed | 2010-09-24 09:05:38 +0000 | [diff] [blame] | 817 | |
| 818 | /* disable exception blocking now when the vbr has been setup */ |
| 819 | clear_bl_bit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 822 | void *set_exception_table_vec(unsigned int vec, void *handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | { |
| 824 | extern void *exception_handling_table[]; |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 825 | void *old_handler; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 826 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 827 | old_handler = exception_handling_table[vec]; |
| 828 | exception_handling_table[vec] = handler; |
| 829 | return old_handler; |
| 830 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 832 | void __init trap_init(void) |
| 833 | { |
| 834 | set_exception_table_vec(TRAP_RESERVED_INST, do_reserved_inst); |
| 835 | set_exception_table_vec(TRAP_ILLEGAL_SLOT_INST, do_illegal_slot_inst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 837 | #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_FPU) || \ |
| 838 | defined(CONFIG_SH_FPU_EMU) |
| 839 | /* |
| 840 | * For SH-4 lacking an FPU, treat floating point instructions as |
| 841 | * reserved. They'll be handled in the math-emu case, or faulted on |
| 842 | * otherwise. |
| 843 | */ |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 844 | set_exception_table_evt(0x800, do_reserved_inst); |
| 845 | set_exception_table_evt(0x820, do_illegal_slot_inst); |
| 846 | #elif defined(CONFIG_SH_FPU) |
Paul Mundt | 74d99a5 | 2007-11-26 20:38:36 +0900 | [diff] [blame] | 847 | set_exception_table_evt(0x800, fpu_state_restore_trap_handler); |
| 848 | set_exception_table_evt(0x820, fpu_state_restore_trap_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | #endif |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 850 | |
| 851 | #ifdef CONFIG_CPU_SH2 |
Paul Mundt | 5a4f7c6 | 2007-11-20 18:08:06 +0900 | [diff] [blame] | 852 | set_exception_table_vec(TRAP_ADDRESS_ERROR, address_error_trap_handler); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 853 | #endif |
| 854 | #ifdef CONFIG_CPU_SH2A |
| 855 | set_exception_table_vec(TRAP_DIVZERO_ERROR, do_divide_error); |
| 856 | set_exception_table_vec(TRAP_DIVOVF_ERROR, do_divide_error); |
Yoshinori Sato | 6e80f5e | 2008-07-10 01:20:03 +0900 | [diff] [blame] | 857 | #ifdef CONFIG_SH_FPU |
| 858 | set_exception_table_vec(TRAP_FPU_ERROR, fpu_error_trap_handler); |
| 859 | #endif |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 860 | #endif |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 861 | |
Peter Griffin | cd89436 | 2009-05-08 15:51:51 +0100 | [diff] [blame] | 862 | #ifdef TRAP_UBC |
Paul Mundt | c476181 | 2010-01-05 12:44:02 +0900 | [diff] [blame] | 863 | set_exception_table_vec(TRAP_UBC, breakpoint_trap_handler); |
Peter Griffin | cd89436 | 2009-05-08 15:51:51 +0100 | [diff] [blame] | 864 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
| 866 | |
| 867 | void show_stack(struct task_struct *tsk, unsigned long *sp) |
| 868 | { |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 869 | unsigned long stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
Paul Mundt | a6a31139 | 2006-09-27 18:22:14 +0900 | [diff] [blame] | 871 | if (!tsk) |
| 872 | tsk = current; |
| 873 | if (tsk == current) |
| 874 | sp = (unsigned long *)current_stack_pointer; |
| 875 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | sp = (unsigned long *)tsk->thread.sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 878 | stack = (unsigned long)sp; |
| 879 | dump_mem("Stack: ", stack, THREAD_SIZE + |
| 880 | (unsigned long)task_stack_page(tsk)); |
| 881 | show_trace(tsk, sp, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | void dump_stack(void) |
| 885 | { |
| 886 | show_stack(NULL, NULL); |
| 887 | } |
| 888 | EXPORT_SYMBOL(dump_stack); |