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> |
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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/system.h> |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 30 | #include <asm/alignment.h> |
Andrew Morton | fad0f90 | 2008-04-16 02:03:51 +0900 | [diff] [blame] | 31 | #include <asm/fpu.h> |
Chris Smith | d39f545 | 2008-09-05 17:15:39 +0900 | [diff] [blame] | 32 | #include <asm/kprobes.h> |
Paul Mundt | 191d0d2 | 2010-01-12 14:50:43 +0900 | [diff] [blame] | 33 | #include <asm/sh_bios.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, |
Matt Fleming | 4aa5ac4 | 2009-08-28 21:37:20 +0000 | [diff] [blame] | 373 | struct mem_access *ma, int expected) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | { |
| 375 | u_int rm; |
| 376 | int ret, index; |
| 377 | |
Paul Mundt | 23c4c82 | 2009-09-24 17:38:18 +0900 | [diff] [blame] | 378 | /* |
| 379 | * XXX: We can't handle mixed 16/32-bit instructions yet |
| 380 | */ |
| 381 | if (instruction_size(instruction) != 2) |
| 382 | return -EINVAL; |
| 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | index = (instruction>>8)&15; /* 0x0F00 */ |
| 385 | rm = regs->regs[index]; |
| 386 | |
Andre Draszik | 9a4af02 | 2009-08-24 14:38:27 +0900 | [diff] [blame] | 387 | /* shout about fixups */ |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 388 | if (!expected) |
| 389 | unaligned_fixups_notify(current, instruction, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | ret = -EFAULT; |
| 392 | switch (instruction&0xF000) { |
| 393 | case 0x0000: |
| 394 | if (instruction==0x000B) { |
| 395 | /* rts */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 396 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | if (ret==0) |
| 398 | regs->pc = regs->pr; |
| 399 | } |
| 400 | else if ((instruction&0x00FF)==0x0023) { |
| 401 | /* braf @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 402 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | if (ret==0) |
| 404 | regs->pc += rm + 4; |
| 405 | } |
| 406 | else if ((instruction&0x00FF)==0x0003) { |
| 407 | /* bsrf @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 408 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if (ret==0) { |
| 410 | regs->pr = regs->pc + 4; |
| 411 | regs->pc += rm + 4; |
| 412 | } |
| 413 | } |
| 414 | else { |
| 415 | /* mov.[bwl] to/from memory via r0+rn */ |
| 416 | goto simple; |
| 417 | } |
| 418 | break; |
| 419 | |
| 420 | case 0x1000: /* mov.l Rm,@(disp,Rn) */ |
| 421 | goto simple; |
| 422 | |
| 423 | case 0x2000: /* mov.[bwl] to memory, possibly with pre-decrement */ |
| 424 | goto simple; |
| 425 | |
| 426 | case 0x4000: |
| 427 | if ((instruction&0x00FF)==0x002B) { |
| 428 | /* jmp @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 429 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | if (ret==0) |
| 431 | regs->pc = rm; |
| 432 | } |
| 433 | else if ((instruction&0x00FF)==0x000B) { |
| 434 | /* jsr @Rm */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 435 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (ret==0) { |
| 437 | regs->pr = regs->pc + 4; |
| 438 | regs->pc = rm; |
| 439 | } |
| 440 | } |
| 441 | else { |
| 442 | /* mov.[bwl] to/from memory via r0+rn */ |
| 443 | goto simple; |
| 444 | } |
| 445 | break; |
| 446 | |
| 447 | case 0x5000: /* mov.l @(disp,Rm),Rn */ |
| 448 | goto simple; |
| 449 | |
| 450 | case 0x6000: /* mov.[bwl] from memory, possibly with post-increment */ |
| 451 | goto simple; |
| 452 | |
| 453 | case 0x8000: /* bf lab, bf/s lab, bt lab, bt/s lab */ |
| 454 | switch (instruction&0x0F00) { |
| 455 | case 0x0100: /* mov.w R0,@(disp,Rm) */ |
| 456 | goto simple; |
| 457 | case 0x0500: /* mov.w @(disp,Rm),R0 */ |
| 458 | goto simple; |
| 459 | case 0x0B00: /* bf lab - no delayslot*/ |
| 460 | break; |
| 461 | case 0x0F00: /* bf/s lab */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 462 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (ret==0) { |
| 464 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) |
| 465 | if ((regs->sr & 0x00000001) != 0) |
| 466 | regs->pc += 4; /* next after slot */ |
| 467 | else |
| 468 | #endif |
| 469 | regs->pc += SH_PC_8BIT_OFFSET(instruction); |
| 470 | } |
| 471 | break; |
| 472 | case 0x0900: /* bt lab - no delayslot */ |
| 473 | break; |
| 474 | case 0x0D00: /* bt/s lab */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 475 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | if (ret==0) { |
| 477 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) |
| 478 | if ((regs->sr & 0x00000001) == 0) |
| 479 | regs->pc += 4; /* next after slot */ |
| 480 | else |
| 481 | #endif |
| 482 | regs->pc += SH_PC_8BIT_OFFSET(instruction); |
| 483 | } |
| 484 | break; |
| 485 | } |
| 486 | break; |
| 487 | |
| 488 | case 0xA000: /* bra label */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 489 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | if (ret==0) |
| 491 | regs->pc += SH_PC_12BIT_OFFSET(instruction); |
| 492 | break; |
| 493 | |
| 494 | case 0xB000: /* bsr label */ |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 495 | ret = handle_delayslot(regs, instruction, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | if (ret==0) { |
| 497 | regs->pr = regs->pc + 4; |
| 498 | regs->pc += SH_PC_12BIT_OFFSET(instruction); |
| 499 | } |
| 500 | break; |
| 501 | } |
| 502 | return ret; |
| 503 | |
| 504 | /* handle non-delay-slot instruction */ |
| 505 | simple: |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 506 | ret = handle_unaligned_ins(instruction, regs, ma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | if (ret==0) |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 508 | regs->pc += instruction_size(instruction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | /* |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 513 | * Handle various address error exceptions: |
| 514 | * - instruction address error: |
| 515 | * misaligned PC |
| 516 | * PC >= 0x80000000 in user mode |
| 517 | * - data address error (read and write) |
| 518 | * misaligned data access |
| 519 | * access to >= 0x80000000 is user mode |
| 520 | * Unfortuntaly we can't distinguish between instruction address error |
Simon Arlott | e868d61 | 2007-05-14 08:15:10 +0900 | [diff] [blame] | 521 | * and data address errors caused by read accesses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | */ |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 523 | asmlinkage void do_address_error(struct pt_regs *regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | unsigned long writeaccess, |
| 525 | unsigned long address) |
| 526 | { |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 527 | unsigned long error_code = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | mm_segment_t oldfs; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 529 | siginfo_t info; |
Paul Mundt | 2bcfffa | 2009-05-09 16:02:08 +0900 | [diff] [blame] | 530 | insn_size_t instruction; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | int tmp; |
| 532 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 533 | /* Intentional ifdef */ |
| 534 | #ifdef CONFIG_CPU_HAS_SR_RB |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 535 | error_code = lookup_exception_vector(); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 536 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | oldfs = get_fs(); |
| 539 | |
| 540 | if (user_mode(regs)) { |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 541 | int si_code = BUS_ADRERR; |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 542 | unsigned int user_action; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | local_irq_enable(); |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 545 | inc_unaligned_user_access(); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 546 | |
Andre Draszik | 5a0ab35 | 2009-08-24 15:01:10 +0900 | [diff] [blame] | 547 | set_fs(USER_DS); |
Paul Mundt | 23c4c82 | 2009-09-24 17:38:18 +0900 | [diff] [blame] | 548 | if (copy_from_user(&instruction, (insn_size_t *)(regs->pc & ~1), |
| 549 | sizeof(instruction))) { |
Andre Draszik | 5a0ab35 | 2009-08-24 15:01:10 +0900 | [diff] [blame] | 550 | set_fs(oldfs); |
| 551 | goto uspace_segv; |
| 552 | } |
| 553 | set_fs(oldfs); |
| 554 | |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 555 | /* shout about userspace fixups */ |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 556 | unaligned_fixups_notify(current, instruction, regs); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 557 | |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 558 | user_action = unaligned_user_action(); |
| 559 | if (user_action & UM_FIXUP) |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 560 | goto fixup; |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 561 | if (user_action & UM_SIGNAL) |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 562 | goto uspace_segv; |
| 563 | else { |
| 564 | /* ignore */ |
Andre Draszik | 5a0ab35 | 2009-08-24 15:01:10 +0900 | [diff] [blame] | 565 | regs->pc += instruction_size(instruction); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 566 | return; |
| 567 | } |
| 568 | |
| 569 | fixup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | /* bad PC is not something we can fix */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 571 | if (regs->pc & 1) { |
| 572 | si_code = BUS_ADRALN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | goto uspace_segv; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 574 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
| 576 | set_fs(USER_DS); |
Magnus Damm | e7cc9a7 | 2008-02-07 20:18:21 +0900 | [diff] [blame] | 577 | tmp = handle_unaligned_access(instruction, regs, |
Matt Fleming | 4aa5ac4 | 2009-08-28 21:37:20 +0000 | [diff] [blame] | 578 | &user_mem_access, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | set_fs(oldfs); |
| 580 | |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 581 | if (tmp == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | return; /* sorted */ |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 583 | uspace_segv: |
| 584 | printk(KERN_NOTICE "Sending SIGBUS to \"%s\" due to unaligned " |
| 585 | "access (PC %lx PR %lx)\n", current->comm, regs->pc, |
| 586 | regs->pr); |
| 587 | |
| 588 | info.si_signo = SIGBUS; |
| 589 | info.si_errno = 0; |
| 590 | info.si_code = si_code; |
Paul Mundt | e08f457 | 2007-05-14 12:52:56 +0900 | [diff] [blame] | 591 | info.si_addr = (void __user *)address; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 592 | force_sig_info(SIGBUS, &info, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } else { |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 594 | inc_unaligned_kernel_access(); |
Andre Draszik | 7436cde | 2009-08-24 14:53:46 +0900 | [diff] [blame] | 595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | if (regs->pc & 1) |
| 597 | die("unaligned program counter", regs, error_code); |
| 598 | |
| 599 | set_fs(KERNEL_DS); |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 600 | if (copy_from_user(&instruction, (void __user *)(regs->pc), |
Magnus Damm | 4b5a9ef | 2008-02-07 20:04:12 +0900 | [diff] [blame] | 601 | sizeof(instruction))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | /* Argh. Fault on the instruction itself. |
| 603 | This should never happen non-SMP |
| 604 | */ |
| 605 | set_fs(oldfs); |
| 606 | die("insn faulting in do_address_error", regs, 0); |
| 607 | } |
| 608 | |
Paul Mundt | a99eae5 | 2010-01-12 16:12:25 +0900 | [diff] [blame^] | 609 | unaligned_fixups_notify(current, instruction, regs); |
Paul Mundt | 40258ee | 2009-09-24 17:48:15 +0900 | [diff] [blame] | 610 | |
Matt Fleming | 4aa5ac4 | 2009-08-28 21:37:20 +0000 | [diff] [blame] | 611 | handle_unaligned_access(instruction, regs, |
| 612 | &user_mem_access, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | set_fs(oldfs); |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | #ifdef CONFIG_SH_DSP |
| 618 | /* |
| 619 | * SH-DSP support gerg@snapgear.com. |
| 620 | */ |
| 621 | int is_dsp_inst(struct pt_regs *regs) |
| 622 | { |
Paul Mundt | 882c12c | 2007-05-14 17:26:34 +0900 | [diff] [blame] | 623 | unsigned short inst = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 625 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | * Safe guard if DSP mode is already enabled or we're lacking |
| 627 | * the DSP altogether. |
| 628 | */ |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 629 | if (!(current_cpu_data.flags & CPU_HAS_DSP) || (regs->sr & SR_DSP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | return 0; |
| 631 | |
| 632 | get_user(inst, ((unsigned short *) regs->pc)); |
| 633 | |
| 634 | inst &= 0xf000; |
| 635 | |
| 636 | /* Check for any type of DSP or support instruction */ |
| 637 | if ((inst == 0xf000) || (inst == 0x4000)) |
| 638 | return 1; |
| 639 | |
| 640 | return 0; |
| 641 | } |
| 642 | #else |
| 643 | #define is_dsp_inst(regs) (0) |
| 644 | #endif /* CONFIG_SH_DSP */ |
| 645 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 646 | #ifdef CONFIG_CPU_SH2A |
| 647 | asmlinkage void do_divide_error(unsigned long r4, unsigned long r5, |
| 648 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 649 | struct pt_regs __regs) |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 650 | { |
| 651 | siginfo_t info; |
| 652 | |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 653 | switch (r4) { |
| 654 | case TRAP_DIVZERO_ERROR: |
| 655 | info.si_code = FPE_INTDIV; |
| 656 | break; |
| 657 | case TRAP_DIVOVF_ERROR: |
| 658 | info.si_code = FPE_INTOVF; |
| 659 | break; |
| 660 | } |
| 661 | |
| 662 | force_sig_info(SIGFPE, &info, current); |
| 663 | } |
| 664 | #endif |
| 665 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 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; |
Michael Trimarchi | 01ab103 | 2009-04-03 17:32:33 +0000 | [diff] [blame] | 693 | /* Save DSP mode */ |
| 694 | tsk->thread.dsp_status.status |= SR_DSP; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 695 | return; |
| 696 | } |
| 697 | #endif |
| 698 | |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 699 | error_code = lookup_exception_vector(); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 700 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 701 | local_irq_enable(); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 702 | force_sig(SIGILL, tsk); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 703 | die_if_no_fixup("reserved instruction", regs, error_code); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | #ifdef CONFIG_SH_FPU_EMU |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 707 | static int emulate_branch(unsigned short inst, struct pt_regs *regs) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 708 | { |
| 709 | /* |
| 710 | * bfs: 8fxx: PC+=d*2+4; |
| 711 | * bts: 8dxx: PC+=d*2+4; |
| 712 | * bra: axxx: PC+=D*2+4; |
| 713 | * bsr: bxxx: PC+=D*2+4 after PR=PC+4; |
| 714 | * braf:0x23: PC+=Rn*2+4; |
| 715 | * bsrf:0x03: PC+=Rn*2+4 after PR=PC+4; |
| 716 | * jmp: 4x2b: PC=Rn; |
| 717 | * jsr: 4x0b: PC=Rn after PR=PC+4; |
| 718 | * rts: 000b: PC=PR; |
| 719 | */ |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 720 | if (((inst & 0xf000) == 0xb000) || /* bsr */ |
| 721 | ((inst & 0xf0ff) == 0x0003) || /* bsrf */ |
| 722 | ((inst & 0xf0ff) == 0x400b)) /* jsr */ |
| 723 | regs->pr = regs->pc + 4; |
| 724 | |
| 725 | if ((inst & 0xfd00) == 0x8d00) { /* bfs, bts */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 726 | regs->pc += SH_PC_8BIT_OFFSET(inst); |
| 727 | return 0; |
| 728 | } |
| 729 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 730 | if ((inst & 0xe000) == 0xa000) { /* bra, bsr */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 731 | regs->pc += SH_PC_12BIT_OFFSET(inst); |
| 732 | return 0; |
| 733 | } |
| 734 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 735 | if ((inst & 0xf0df) == 0x0003) { /* braf, bsrf */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 736 | regs->pc += regs->regs[(inst & 0x0f00) >> 8] + 4; |
| 737 | return 0; |
| 738 | } |
| 739 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 740 | if ((inst & 0xf0df) == 0x400b) { /* jmp, jsr */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 741 | regs->pc = regs->regs[(inst & 0x0f00) >> 8]; |
| 742 | return 0; |
| 743 | } |
| 744 | |
Paul Mundt | edfd6da | 2008-11-26 13:06:04 +0900 | [diff] [blame] | 745 | if ((inst & 0xffff) == 0x000b) { /* rts */ |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 746 | regs->pc = regs->pr; |
| 747 | return 0; |
| 748 | } |
| 749 | |
| 750 | return 1; |
| 751 | } |
| 752 | #endif |
| 753 | |
| 754 | asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5, |
| 755 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 756 | struct pt_regs __regs) |
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 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Paul Mundt | b3d765f | 2008-09-17 23:12:11 +0900 | [diff] [blame] | 759 | unsigned long inst; |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 760 | struct task_struct *tsk = current; |
Chris Smith | d39f545 | 2008-09-05 17:15:39 +0900 | [diff] [blame] | 761 | |
| 762 | if (kprobe_handle_illslot(regs->pc) == 0) |
| 763 | return; |
| 764 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 765 | #ifdef CONFIG_SH_FPU_EMU |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 766 | get_user(inst, (unsigned short *)regs->pc + 1); |
| 767 | if (!do_fpu_inst(inst, regs)) { |
| 768 | get_user(inst, (unsigned short *)regs->pc); |
| 769 | if (!emulate_branch(inst, regs)) |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 770 | return; |
| 771 | /* fault in branch.*/ |
| 772 | } |
| 773 | /* not a FPU inst. */ |
| 774 | #endif |
| 775 | |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 776 | inst = lookup_exception_vector(); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 777 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 778 | local_irq_enable(); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 779 | force_sig(SIGILL, tsk); |
Paul Mundt | b3d765f | 2008-09-17 23:12:11 +0900 | [diff] [blame] | 780 | die_if_no_fixup("illegal slot instruction", regs, inst); |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 781 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
| 783 | asmlinkage void do_exception_error(unsigned long r4, unsigned long r5, |
| 784 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 785 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 787 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | long ex; |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 789 | |
Paul Mundt | 4c59e29 | 2008-09-21 12:00:23 +0900 | [diff] [blame] | 790 | ex = lookup_exception_vector(); |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 791 | die_if_kernel("exception", regs, ex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
| 793 | |
Paul Mundt | aba1030 | 2007-09-21 18:32:32 +0900 | [diff] [blame] | 794 | void __cpuinit per_cpu_trap_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | { |
| 796 | extern void *vbr_base; |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | /* NOTE: The VBR value should be at P1 |
| 799 | (or P2, virtural "fixed" address space). |
| 800 | It's definitely should not in physical address. */ |
| 801 | |
| 802 | asm volatile("ldc %0, vbr" |
| 803 | : /* no output */ |
| 804 | : "r" (&vbr_base) |
| 805 | : "memory"); |
| 806 | } |
| 807 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 808 | void *set_exception_table_vec(unsigned int vec, void *handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | { |
| 810 | extern void *exception_handling_table[]; |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 811 | void *old_handler; |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 812 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 813 | old_handler = exception_handling_table[vec]; |
| 814 | exception_handling_table[vec] = handler; |
| 815 | return old_handler; |
| 816 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 818 | void __init trap_init(void) |
| 819 | { |
| 820 | set_exception_table_vec(TRAP_RESERVED_INST, do_reserved_inst); |
| 821 | set_exception_table_vec(TRAP_ILLEGAL_SLOT_INST, do_illegal_slot_inst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
Takashi YOSHII | 4b56568 | 2006-09-27 17:15:32 +0900 | [diff] [blame] | 823 | #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_FPU) || \ |
| 824 | defined(CONFIG_SH_FPU_EMU) |
| 825 | /* |
| 826 | * For SH-4 lacking an FPU, treat floating point instructions as |
| 827 | * reserved. They'll be handled in the math-emu case, or faulted on |
| 828 | * otherwise. |
| 829 | */ |
Paul Mundt | 1f66658 | 2006-10-19 16:20:25 +0900 | [diff] [blame] | 830 | set_exception_table_evt(0x800, do_reserved_inst); |
| 831 | set_exception_table_evt(0x820, do_illegal_slot_inst); |
| 832 | #elif defined(CONFIG_SH_FPU) |
Paul Mundt | 74d99a5 | 2007-11-26 20:38:36 +0900 | [diff] [blame] | 833 | set_exception_table_evt(0x800, fpu_state_restore_trap_handler); |
| 834 | set_exception_table_evt(0x820, fpu_state_restore_trap_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | #endif |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 836 | |
| 837 | #ifdef CONFIG_CPU_SH2 |
Paul Mundt | 5a4f7c6 | 2007-11-20 18:08:06 +0900 | [diff] [blame] | 838 | set_exception_table_vec(TRAP_ADDRESS_ERROR, address_error_trap_handler); |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 839 | #endif |
| 840 | #ifdef CONFIG_CPU_SH2A |
| 841 | set_exception_table_vec(TRAP_DIVZERO_ERROR, do_divide_error); |
| 842 | set_exception_table_vec(TRAP_DIVOVF_ERROR, do_divide_error); |
Yoshinori Sato | 6e80f5e | 2008-07-10 01:20:03 +0900 | [diff] [blame] | 843 | #ifdef CONFIG_SH_FPU |
| 844 | set_exception_table_vec(TRAP_FPU_ERROR, fpu_error_trap_handler); |
| 845 | #endif |
Yoshinori Sato | 0983b31 | 2006-11-05 15:58:47 +0900 | [diff] [blame] | 846 | #endif |
Stuart Menefy | b5a1bcb | 2006-11-21 13:34:04 +0900 | [diff] [blame] | 847 | |
Peter Griffin | cd89436 | 2009-05-08 15:51:51 +0100 | [diff] [blame] | 848 | #ifdef TRAP_UBC |
| 849 | set_exception_table_vec(TRAP_UBC, break_point_trap); |
| 850 | #endif |
| 851 | |
Paul Mundt | 191d0d2 | 2010-01-12 14:50:43 +0900 | [diff] [blame] | 852 | /* Save off the BIOS VBR, if there is one */ |
| 853 | sh_bios_vbr_init(); |
| 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | /* Setup VBR for boot cpu */ |
| 856 | per_cpu_trap_init(); |
| 857 | } |
| 858 | |
| 859 | void show_stack(struct task_struct *tsk, unsigned long *sp) |
| 860 | { |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 861 | unsigned long stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
Paul Mundt | a6a31139 | 2006-09-27 18:22:14 +0900 | [diff] [blame] | 863 | if (!tsk) |
| 864 | tsk = current; |
| 865 | if (tsk == current) |
| 866 | sp = (unsigned long *)current_stack_pointer; |
| 867 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | sp = (unsigned long *)tsk->thread.sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Paul Mundt | 6b00223 | 2006-10-12 17:07:45 +0900 | [diff] [blame] | 870 | stack = (unsigned long)sp; |
| 871 | dump_mem("Stack: ", stack, THREAD_SIZE + |
| 872 | (unsigned long)task_stack_page(tsk)); |
| 873 | show_trace(tsk, sp, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | void dump_stack(void) |
| 877 | { |
| 878 | show_stack(NULL, NULL); |
| 879 | } |
| 880 | EXPORT_SYMBOL(dump_stack); |