Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/traps.c |
| 3 | * |
Russell King | ab72b00 | 2009-10-25 15:39:37 +0000 | [diff] [blame] | 4 | * Copyright (C) 1995-2009 Russell King |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * 'traps.c' handles hardware exceptions after we have saved some state in |
| 12 | * 'linux/arch/arm/lib/traps.S'. Mostly a debugging aid, but will probably |
| 13 | * kill the offending process. |
| 14 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/personality.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kallsyms.h> |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 18 | #include <linux/spinlock.h> |
Russell King | 33fa9b1 | 2008-09-06 11:35:55 +0100 | [diff] [blame] | 19 | #include <linux/uaccess.h> |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 20 | #include <linux/hardirq.h> |
| 21 | #include <linux/kdebug.h> |
Masami Hiramatsu | 10b408d | 2018-05-13 05:04:16 +0100 | [diff] [blame] | 22 | #include <linux/kprobes.h> |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 23 | #include <linux/module.h> |
| 24 | #include <linux/kexec.h> |
Simon Glass | 87e040b | 2011-08-16 23:44:26 +0100 | [diff] [blame] | 25 | #include <linux/bug.h> |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 26 | #include <linux/delay.h> |
| 27 | #include <linux/init.h> |
Will Deacon | 425fc47 | 2011-02-14 14:31:09 +0100 | [diff] [blame] | 28 | #include <linux/sched.h> |
Daniel Thompson | c0e7f7e | 2014-09-17 17:12:06 +0100 | [diff] [blame] | 29 | #include <linux/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 31 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/cacheflush.h> |
Jamie Iles | 5a567d7 | 2011-10-08 11:20:42 +0100 | [diff] [blame] | 33 | #include <asm/exception.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/unistd.h> |
| 35 | #include <asm/traps.h> |
Nikolay Borisov | 49432d4 | 2014-06-03 19:50:09 +0100 | [diff] [blame] | 36 | #include <asm/ptrace.h> |
Catalin Marinas | bff595c | 2009-02-16 11:41:36 +0100 | [diff] [blame] | 37 | #include <asm/unwind.h> |
Tony Lindgren | f159f4e | 2010-07-05 14:53:10 +0100 | [diff] [blame] | 38 | #include <asm/tls.h> |
David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 39 | #include <asm/system_misc.h> |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 40 | #include <asm/opcodes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Nikolay Borisov | 49432d4 | 2014-06-03 19:50:09 +0100 | [diff] [blame] | 42 | |
Russell King | 29c350b | 2014-01-03 15:01:39 +0000 | [diff] [blame] | 43 | static const char *handler[]= { |
| 44 | "prefetch abort", |
| 45 | "data abort", |
| 46 | "address exception", |
| 47 | "interrupt", |
| 48 | "undefined instruction", |
| 49 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 51 | void *vectors_page; |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #ifdef CONFIG_DEBUG_USER |
| 54 | unsigned int user_debug; |
| 55 | |
| 56 | static int __init user_debug_setup(char *str) |
| 57 | { |
| 58 | get_option(&str, &user_debug); |
| 59 | return 1; |
| 60 | } |
| 61 | __setup("user_debug=", user_debug_setup); |
| 62 | #endif |
| 63 | |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 64 | static void dump_mem(const char *, const char *, unsigned long, unsigned long); |
Russell King | 7ab3f8d | 2007-03-02 15:01:36 +0000 | [diff] [blame] | 65 | |
Russell King | 7ab3f8d | 2007-03-02 15:01:36 +0000 | [diff] [blame] | 66 | void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
| 68 | #ifdef CONFIG_KALLSYMS |
Russell King | ef41b5c | 2013-10-20 15:34:10 +0100 | [diff] [blame] | 69 | printk("[<%08lx>] (%ps) from [<%08lx>] (%pS)\n", where, (void *)where, from, (void *)from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #else |
| 71 | printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from); |
| 72 | #endif |
Russell King | 7ab3f8d | 2007-03-02 15:01:36 +0000 | [diff] [blame] | 73 | |
| 74 | if (in_exception_text(where)) |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 75 | dump_mem("", "Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | } |
| 77 | |
Russell King | 24c66df | 2016-11-15 13:55:59 +0000 | [diff] [blame] | 78 | void dump_backtrace_stm(u32 *stack, u32 instruction) |
| 79 | { |
| 80 | char str[80], *p; |
| 81 | unsigned int x; |
| 82 | int reg; |
| 83 | |
| 84 | for (reg = 10, x = 0, p = str; reg >= 0; reg--) { |
| 85 | if (instruction & BIT(reg)) { |
| 86 | p += sprintf(p, " r%d:%08x", reg, *stack--); |
| 87 | if (++x == 6) { |
| 88 | x = 0; |
| 89 | p = str; |
| 90 | printk("%s\n", str); |
| 91 | } |
| 92 | } |
| 93 | } |
| 94 | if (p != str) |
| 95 | printk("%s\n", str); |
| 96 | } |
| 97 | |
Catalin Marinas | bff595c | 2009-02-16 11:41:36 +0100 | [diff] [blame] | 98 | #ifndef CONFIG_ARM_UNWIND |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | /* |
| 100 | * Stack pointers should always be within the kernels view of |
| 101 | * physical memory. If it is not there, then we can't dump |
| 102 | * out any information relating to the stack. |
| 103 | */ |
| 104 | static int verify_stack(unsigned long sp) |
| 105 | { |
Russell King | 09d9bae | 2008-09-05 14:08:44 +0100 | [diff] [blame] | 106 | if (sp < PAGE_OFFSET || |
| 107 | (sp > (unsigned long)high_memory && high_memory != NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return -EFAULT; |
| 109 | |
| 110 | return 0; |
| 111 | } |
Catalin Marinas | bff595c | 2009-02-16 11:41:36 +0100 | [diff] [blame] | 112 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | * Dump out the contents of some memory nicely... |
| 116 | */ |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 117 | static void dump_mem(const char *lvl, const char *str, unsigned long bottom, |
| 118 | unsigned long top) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 120 | unsigned long first; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | mm_segment_t fs; |
| 122 | int i; |
| 123 | |
| 124 | /* |
| 125 | * We need to switch to kernel mode so that we can use __get_user |
| 126 | * to safely read from kernel space. Note that we now dump the |
| 127 | * code first, just in case the backtrace kills us. |
| 128 | */ |
| 129 | fs = get_fs(); |
| 130 | set_fs(KERNEL_DS); |
| 131 | |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 132 | printk("%s%s(0x%08lx to 0x%08lx)\n", lvl, str, bottom, top); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 134 | for (first = bottom & ~31; first < top; first += 32) { |
| 135 | unsigned long p; |
| 136 | char str[sizeof(" 12345678") * 8 + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 138 | memset(str, ' ', sizeof(str)); |
| 139 | str[sizeof(str) - 1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 141 | for (p = first, i = 0; i < 8 && p < top; i++, p += 4) { |
| 142 | if (p >= bottom && p < top) { |
| 143 | unsigned long val; |
| 144 | if (__get_user(val, (unsigned long *)p) == 0) |
| 145 | sprintf(str + i * 9, " %08lx", val); |
| 146 | else |
| 147 | sprintf(str + i * 9, " ????????"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | } |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 150 | printk("%s%04lx:%s\n", lvl, first & 0xffff, str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | set_fs(fs); |
| 154 | } |
| 155 | |
Mark Rutland | 1541afb | 2017-11-02 18:44:28 +0100 | [diff] [blame] | 156 | static void __dump_instr(const char *lvl, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | { |
| 158 | unsigned long addr = instruction_pointer(regs); |
| 159 | const int thumb = thumb_mode(regs); |
| 160 | const int width = thumb ? 4 : 8; |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 161 | char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | int i; |
| 163 | |
| 164 | /* |
Mark Rutland | 1541afb | 2017-11-02 18:44:28 +0100 | [diff] [blame] | 165 | * Note that we now dump the code first, just in case the backtrace |
| 166 | * kills us. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Russell King | a901158 | 2011-06-09 23:21:11 +0100 | [diff] [blame] | 169 | for (i = -4; i < 1 + !!thumb; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | unsigned int val, bad; |
| 171 | |
| 172 | if (thumb) |
Mark Rutland | 1541afb | 2017-11-02 18:44:28 +0100 | [diff] [blame] | 173 | bad = get_user(val, &((u16 *)addr)[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | else |
Mark Rutland | 1541afb | 2017-11-02 18:44:28 +0100 | [diff] [blame] | 175 | bad = get_user(val, &((u32 *)addr)[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | if (!bad) |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 178 | p += sprintf(p, i == 0 ? "(%0*x) " : "%0*x ", |
| 179 | width, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | else { |
Russell King | d191fe0 | 2009-10-11 15:03:11 +0100 | [diff] [blame] | 181 | p += sprintf(p, "bad PC value"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | break; |
| 183 | } |
| 184 | } |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 185 | printk("%sCode: %s\n", lvl, str); |
Mark Rutland | 1541afb | 2017-11-02 18:44:28 +0100 | [diff] [blame] | 186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Mark Rutland | 1541afb | 2017-11-02 18:44:28 +0100 | [diff] [blame] | 188 | static void dump_instr(const char *lvl, struct pt_regs *regs) |
| 189 | { |
| 190 | mm_segment_t fs; |
| 191 | |
| 192 | if (!user_mode(regs)) { |
| 193 | fs = get_fs(); |
| 194 | set_fs(KERNEL_DS); |
| 195 | __dump_instr(lvl, regs); |
| 196 | set_fs(fs); |
| 197 | } else { |
| 198 | __dump_instr(lvl, regs); |
| 199 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | } |
| 201 | |
Catalin Marinas | bff595c | 2009-02-16 11:41:36 +0100 | [diff] [blame] | 202 | #ifdef CONFIG_ARM_UNWIND |
| 203 | static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) |
| 204 | { |
| 205 | unwind_backtrace(regs, tsk); |
| 206 | } |
| 207 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) |
| 209 | { |
Catalin Marinas | 67a94c2 | 2009-02-11 13:06:53 +0100 | [diff] [blame] | 210 | unsigned int fp, mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | int ok = 1; |
| 212 | |
| 213 | printk("Backtrace: "); |
Catalin Marinas | 67a94c2 | 2009-02-11 13:06:53 +0100 | [diff] [blame] | 214 | |
| 215 | if (!tsk) |
| 216 | tsk = current; |
| 217 | |
| 218 | if (regs) { |
Nikolay Borisov | 49432d4 | 2014-06-03 19:50:09 +0100 | [diff] [blame] | 219 | fp = frame_pointer(regs); |
Catalin Marinas | 67a94c2 | 2009-02-11 13:06:53 +0100 | [diff] [blame] | 220 | mode = processor_mode(regs); |
| 221 | } else if (tsk != current) { |
| 222 | fp = thread_saved_fp(tsk); |
| 223 | mode = 0x10; |
| 224 | } else { |
| 225 | asm("mov %0, fp" : "=r" (fp) : : "cc"); |
| 226 | mode = 0x10; |
| 227 | } |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | if (!fp) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 230 | pr_cont("no frame pointer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | ok = 0; |
| 232 | } else if (verify_stack(fp)) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 233 | pr_cont("invalid frame pointer 0x%08x", fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | ok = 0; |
Al Viro | 5520582 | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 235 | } else if (fp < (unsigned long)end_of_stack(tsk)) |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 236 | pr_cont("frame pointer underflow"); |
| 237 | pr_cont("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | if (ok) |
Catalin Marinas | 67a94c2 | 2009-02-11 13:06:53 +0100 | [diff] [blame] | 240 | c_backtrace(fp, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | } |
Catalin Marinas | bff595c | 2009-02-16 11:41:36 +0100 | [diff] [blame] | 242 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | void show_stack(struct task_struct *tsk, unsigned long *sp) |
| 245 | { |
Catalin Marinas | 67a94c2 | 2009-02-11 13:06:53 +0100 | [diff] [blame] | 246 | dump_backtrace(NULL, tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | barrier(); |
| 248 | } |
| 249 | |
Russell King | d920242 | 2007-06-17 13:38:27 +0100 | [diff] [blame] | 250 | #ifdef CONFIG_PREEMPT |
| 251 | #define S_PREEMPT " PREEMPT" |
| 252 | #else |
| 253 | #define S_PREEMPT "" |
| 254 | #endif |
| 255 | #ifdef CONFIG_SMP |
| 256 | #define S_SMP " SMP" |
| 257 | #else |
| 258 | #define S_SMP "" |
| 259 | #endif |
Russell King | 8211ca6 | 2012-02-04 12:12:11 +0000 | [diff] [blame] | 260 | #ifdef CONFIG_THUMB2_KERNEL |
| 261 | #define S_ISA " THUMB2" |
| 262 | #else |
| 263 | #define S_ISA " ARM" |
| 264 | #endif |
Russell King | d920242 | 2007-06-17 13:38:27 +0100 | [diff] [blame] | 265 | |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 266 | static int __die(const char *str, int err, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | { |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 268 | struct task_struct *tsk = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | static int die_counter; |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 270 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 272 | pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP S_ISA "\n", |
| 273 | str, err, ++die_counter); |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 274 | |
| 275 | /* trap and error numbers are mostly meaningless on ARM */ |
| 276 | ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV); |
| 277 | if (ret == NOTIFY_STOP) |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 278 | return 1; |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | print_modules(); |
Russell King | 652a12e | 2005-04-17 15:50:36 +0100 | [diff] [blame] | 281 | __show_regs(regs); |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 282 | pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n", |
| 283 | TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), end_of_stack(tsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | if (!user_mode(regs) || in_interrupt()) { |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 286 | dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp, |
Al Viro | 32d39a9 | 2006-01-12 01:05:58 -0800 | [diff] [blame] | 287 | THREAD_SIZE + (unsigned long)task_stack_page(tsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | dump_backtrace(regs, tsk); |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 289 | dump_instr(KERN_EMERG, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 291 | |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 292 | return 0; |
Russell King | d362979 | 2005-10-30 19:01:43 +0000 | [diff] [blame] | 293 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 295 | static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
| 296 | static int die_owner = -1; |
| 297 | static unsigned int die_nest_count; |
Russell King | d362979 | 2005-10-30 19:01:43 +0000 | [diff] [blame] | 298 | |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 299 | static unsigned long oops_begin(void) |
Russell King | d362979 | 2005-10-30 19:01:43 +0000 | [diff] [blame] | 300 | { |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 301 | int cpu; |
| 302 | unsigned long flags; |
Russell King | d362979 | 2005-10-30 19:01:43 +0000 | [diff] [blame] | 303 | |
Russell King | d920242 | 2007-06-17 13:38:27 +0100 | [diff] [blame] | 304 | oops_enter(); |
| 305 | |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 306 | /* racy, but better than risking deadlock. */ |
| 307 | raw_local_irq_save(flags); |
| 308 | cpu = smp_processor_id(); |
| 309 | if (!arch_spin_trylock(&die_lock)) { |
| 310 | if (cpu == die_owner) |
| 311 | /* nested oops. should stop eventually */; |
| 312 | else |
| 313 | arch_spin_lock(&die_lock); |
| 314 | } |
| 315 | die_nest_count++; |
| 316 | die_owner = cpu; |
Russell King | 03a6e5b | 2009-10-11 15:25:05 +0100 | [diff] [blame] | 317 | console_verbose(); |
Russell King | d362979 | 2005-10-30 19:01:43 +0000 | [diff] [blame] | 318 | bust_spinlocks(1); |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 319 | return flags; |
| 320 | } |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 321 | |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 322 | static void oops_end(unsigned long flags, struct pt_regs *regs, int signr) |
| 323 | { |
| 324 | if (regs && kexec_should_crash(current)) |
Russell King | a9221de | 2010-01-20 17:02:54 +0000 | [diff] [blame] | 325 | crash_kexec(regs); |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | bust_spinlocks(0); |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 328 | die_owner = -1; |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 329 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 330 | die_nest_count--; |
| 331 | if (!die_nest_count) |
| 332 | /* Nest count reaches zero, release the lock. */ |
| 333 | arch_spin_unlock(&die_lock); |
| 334 | raw_local_irq_restore(flags); |
Russell King | 03a6e5b | 2009-10-11 15:25:05 +0100 | [diff] [blame] | 335 | oops_exit(); |
Russell King | 3186749 | 2006-02-19 19:53:56 +0000 | [diff] [blame] | 336 | |
Russell King | d920242 | 2007-06-17 13:38:27 +0100 | [diff] [blame] | 337 | if (in_interrupt()) |
| 338 | panic("Fatal exception in interrupt"); |
Horms | cea6a4b | 2006-07-30 03:03:34 -0700 | [diff] [blame] | 339 | if (panic_on_oops) |
Horms | 012c437 | 2006-08-13 23:24:22 -0700 | [diff] [blame] | 340 | panic("Fatal exception"); |
Rabin Vincent | 02df19b | 2012-06-15 10:23:32 +0100 | [diff] [blame] | 341 | if (signr) |
| 342 | do_exit(signr); |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * This function is protected against re-entrancy. |
| 347 | */ |
| 348 | void die(const char *str, struct pt_regs *regs, int err) |
| 349 | { |
| 350 | enum bug_trap_type bug_type = BUG_TRAP_TYPE_NONE; |
| 351 | unsigned long flags = oops_begin(); |
| 352 | int sig = SIGSEGV; |
| 353 | |
| 354 | if (!user_mode(regs)) |
| 355 | bug_type = report_bug(regs->ARM_pc, regs); |
| 356 | if (bug_type != BUG_TRAP_TYPE_NONE) |
| 357 | str = "Oops - BUG"; |
| 358 | |
| 359 | if (__die(str, err, regs)) |
| 360 | sig = 0; |
| 361 | |
| 362 | oops_end(flags, regs, sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 365 | void arm_notify_die(const char *str, struct pt_regs *regs, |
| 366 | struct siginfo *info, unsigned long err, unsigned long trap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
| 368 | if (user_mode(regs)) { |
| 369 | current->thread.error_code = err; |
| 370 | current->thread.trap_no = trap; |
| 371 | |
| 372 | force_sig_info(info->si_signo, info, current); |
| 373 | } else { |
| 374 | die(str, regs, err); |
| 375 | } |
| 376 | } |
| 377 | |
Simon Glass | 87e040b | 2011-08-16 23:44:26 +0100 | [diff] [blame] | 378 | #ifdef CONFIG_GENERIC_BUG |
| 379 | |
| 380 | int is_valid_bugaddr(unsigned long pc) |
| 381 | { |
| 382 | #ifdef CONFIG_THUMB2_KERNEL |
Ben Dooks | 6332807 | 2013-07-25 14:38:03 +0100 | [diff] [blame] | 383 | u16 bkpt; |
| 384 | u16 insn = __opcode_to_mem_thumb16(BUG_INSTR_VALUE); |
Simon Glass | 87e040b | 2011-08-16 23:44:26 +0100 | [diff] [blame] | 385 | #else |
Ben Dooks | 6332807 | 2013-07-25 14:38:03 +0100 | [diff] [blame] | 386 | u32 bkpt; |
| 387 | u32 insn = __opcode_to_mem_arm(BUG_INSTR_VALUE); |
Simon Glass | 87e040b | 2011-08-16 23:44:26 +0100 | [diff] [blame] | 388 | #endif |
| 389 | |
| 390 | if (probe_kernel_address((unsigned *)pc, bkpt)) |
| 391 | return 0; |
| 392 | |
Ben Dooks | 6332807 | 2013-07-25 14:38:03 +0100 | [diff] [blame] | 393 | return bkpt == insn; |
Simon Glass | 87e040b | 2011-08-16 23:44:26 +0100 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | #endif |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | static LIST_HEAD(undef_hook); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 399 | static DEFINE_RAW_SPINLOCK(undef_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | void register_undef_hook(struct undef_hook *hook) |
| 402 | { |
Russell King | 109d89c | 2005-07-16 16:43:33 +0100 | [diff] [blame] | 403 | unsigned long flags; |
| 404 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 405 | raw_spin_lock_irqsave(&undef_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | list_add(&hook->node, &undef_hook); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 407 | raw_spin_unlock_irqrestore(&undef_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
| 409 | |
| 410 | void unregister_undef_hook(struct undef_hook *hook) |
| 411 | { |
Russell King | 109d89c | 2005-07-16 16:43:33 +0100 | [diff] [blame] | 412 | unsigned long flags; |
| 413 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 414 | raw_spin_lock_irqsave(&undef_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | list_del(&hook->node); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 416 | raw_spin_unlock_irqrestore(&undef_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Masami Hiramatsu | 10b408d | 2018-05-13 05:04:16 +0100 | [diff] [blame] | 419 | static nokprobe_inline |
| 420 | int call_undef_hook(struct pt_regs *regs, unsigned int instr) |
Russell King | b03a5b7 | 2008-08-11 12:27:16 +0100 | [diff] [blame] | 421 | { |
| 422 | struct undef_hook *hook; |
| 423 | unsigned long flags; |
| 424 | int (*fn)(struct pt_regs *regs, unsigned int instr) = NULL; |
| 425 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 426 | raw_spin_lock_irqsave(&undef_lock, flags); |
Russell King | b03a5b7 | 2008-08-11 12:27:16 +0100 | [diff] [blame] | 427 | list_for_each_entry(hook, &undef_hook, node) |
| 428 | if ((instr & hook->instr_mask) == hook->instr_val && |
| 429 | (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) |
| 430 | fn = hook->fn; |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 431 | raw_spin_unlock_irqrestore(&undef_lock, flags); |
Russell King | b03a5b7 | 2008-08-11 12:27:16 +0100 | [diff] [blame] | 432 | |
| 433 | return fn ? fn(regs, instr) : 1; |
| 434 | } |
| 435 | |
Russell King | 7ab3f8d | 2007-03-02 15:01:36 +0000 | [diff] [blame] | 436 | asmlinkage void __exception do_undefinstr(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | unsigned int instr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | siginfo_t info; |
| 440 | void __user *pc; |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | pc = (void __user *)instruction_pointer(regs); |
Dan Williams | dfc544c | 2007-02-13 17:11:34 +0100 | [diff] [blame] | 443 | |
| 444 | if (processor_mode(regs) == SVC_MODE) { |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 445 | #ifdef CONFIG_THUMB2_KERNEL |
| 446 | if (thumb_mode(regs)) { |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 447 | instr = __mem_to_opcode_thumb16(((u16 *)pc)[0]); |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 448 | if (is_wide_instruction(instr)) { |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 449 | u16 inst2; |
| 450 | inst2 = __mem_to_opcode_thumb16(((u16 *)pc)[1]); |
| 451 | instr = __opcode_thumb32_compose(instr, inst2); |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 452 | } |
| 453 | } else |
| 454 | #endif |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 455 | instr = __mem_to_opcode_arm(*(u32 *) pc); |
Dan Williams | dfc544c | 2007-02-13 17:11:34 +0100 | [diff] [blame] | 456 | } else if (thumb_mode(regs)) { |
Will Deacon | 2b2040a | 2012-09-07 18:21:44 +0100 | [diff] [blame] | 457 | if (get_user(instr, (u16 __user *)pc)) |
| 458 | goto die_sig; |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 459 | instr = __mem_to_opcode_thumb16(instr); |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 460 | if (is_wide_instruction(instr)) { |
| 461 | unsigned int instr2; |
Will Deacon | 2b2040a | 2012-09-07 18:21:44 +0100 | [diff] [blame] | 462 | if (get_user(instr2, (u16 __user *)pc+1)) |
| 463 | goto die_sig; |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 464 | instr2 = __mem_to_opcode_thumb16(instr2); |
| 465 | instr = __opcode_thumb32_compose(instr, instr2); |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 466 | } |
Taras Kondratiuk | d6cd989 | 2014-01-10 01:36:00 +0100 | [diff] [blame] | 467 | } else { |
| 468 | if (get_user(instr, (u32 __user *)pc)) |
| 469 | goto die_sig; |
Ben Dooks | a79a0cb | 2013-07-19 17:12:05 +0100 | [diff] [blame] | 470 | instr = __mem_to_opcode_arm(instr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | |
Russell King | b03a5b7 | 2008-08-11 12:27:16 +0100 | [diff] [blame] | 473 | if (call_undef_hook(regs, instr) == 0) |
| 474 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Will Deacon | 2b2040a | 2012-09-07 18:21:44 +0100 | [diff] [blame] | 476 | die_sig: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | #ifdef CONFIG_DEBUG_USER |
| 478 | if (user_debug & UDBG_UNDEFINED) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 479 | pr_info("%s (%d): undefined instruction: pc=%p\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 480 | current->comm, task_pid_nr(current), pc); |
Russell King | b5b6b5f | 2014-04-10 00:49:50 +0100 | [diff] [blame] | 481 | __show_regs(regs); |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 482 | dump_instr(KERN_INFO, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | #endif |
| 485 | |
| 486 | info.si_signo = SIGILL; |
| 487 | info.si_errno = 0; |
| 488 | info.si_code = ILL_ILLOPC; |
| 489 | info.si_addr = pc; |
| 490 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 491 | arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | } |
Masami Hiramatsu | 10b408d | 2018-05-13 05:04:16 +0100 | [diff] [blame] | 493 | NOKPROBE_SYMBOL(do_undefinstr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | /* |
Daniel Thompson | c0e7f7e | 2014-09-17 17:12:06 +0100 | [diff] [blame] | 496 | * Handle FIQ similarly to NMI on x86 systems. |
| 497 | * |
| 498 | * The runtime environment for NMIs is extremely restrictive |
| 499 | * (NMIs can pre-empt critical sections meaning almost all locking is |
| 500 | * forbidden) meaning this default FIQ handling must only be used in |
| 501 | * circumstances where non-maskability improves robustness, such as |
| 502 | * watchdog or debug logic. |
| 503 | * |
| 504 | * This handler is not appropriate for general purpose use in drivers |
| 505 | * platform code and can be overrideen using set_fiq_handler. |
| 506 | */ |
| 507 | asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs) |
| 508 | { |
| 509 | struct pt_regs *old_regs = set_irq_regs(regs); |
| 510 | |
| 511 | nmi_enter(); |
| 512 | |
| 513 | /* nop. FIQ handlers for special arch/arm features can be added here. */ |
| 514 | |
| 515 | nmi_exit(); |
| 516 | |
| 517 | set_irq_regs(old_regs); |
| 518 | } |
| 519 | |
| 520 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | * bad_mode handles the impossible case in the vectors. If you see one of |
| 522 | * these, then it's extremely serious, and could mean you have buggy hardware. |
| 523 | * It never returns, and never tries to sync. We hope that we can at least |
| 524 | * dump out some state information... |
| 525 | */ |
Russell King | ae0a846 | 2007-01-09 12:57:37 +0000 | [diff] [blame] | 526 | asmlinkage void bad_mode(struct pt_regs *regs, int reason) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
| 528 | console_verbose(); |
| 529 | |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 530 | pr_crit("Bad mode in %s handler detected\n", handler[reason]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
| 532 | die("Oops - bad mode", regs, 0); |
| 533 | local_irq_disable(); |
| 534 | panic("bad mode"); |
| 535 | } |
| 536 | |
| 537 | static int bad_syscall(int n, struct pt_regs *regs) |
| 538 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | siginfo_t info; |
| 540 | |
Richard Weinberger | a498044 | 2014-07-13 15:24:03 +0200 | [diff] [blame] | 541 | if ((current->personality & PER_MASK) != PER_LINUX) { |
| 542 | send_sig(SIGSEGV, current, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | return regs->ARM_r0; |
| 544 | } |
| 545 | |
| 546 | #ifdef CONFIG_DEBUG_USER |
| 547 | if (user_debug & UDBG_SYSCALL) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 548 | pr_err("[%d] %s: obsolete system call %08x.\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 549 | task_pid_nr(current), current->comm, n); |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 550 | dump_instr(KERN_ERR, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | #endif |
| 553 | |
| 554 | info.si_signo = SIGILL; |
| 555 | info.si_errno = 0; |
| 556 | info.si_code = ILL_ILLTRP; |
| 557 | info.si_addr = (void __user *)instruction_pointer(regs) - |
| 558 | (thumb_mode(regs) ? 2 : 4); |
| 559 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 560 | arm_notify_die("Oops - bad syscall", regs, &info, n, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | return regs->ARM_r0; |
| 563 | } |
| 564 | |
Will Deacon | 28256d6 | 2013-05-13 15:21:49 +0100 | [diff] [blame] | 565 | static inline int |
| 566 | __do_cache_op(unsigned long start, unsigned long end) |
| 567 | { |
| 568 | int ret; |
Will Deacon | 28256d6 | 2013-05-13 15:21:49 +0100 | [diff] [blame] | 569 | |
| 570 | do { |
Jon Medhurst | b31459a | 2013-12-09 13:45:46 +0100 | [diff] [blame] | 571 | unsigned long chunk = min(PAGE_SIZE, end - start); |
| 572 | |
Vladimir Murzin | 3f4aa45 | 2014-11-27 11:39:04 +0100 | [diff] [blame] | 573 | if (fatal_signal_pending(current)) |
| 574 | return 0; |
Will Deacon | 28256d6 | 2013-05-13 15:21:49 +0100 | [diff] [blame] | 575 | |
| 576 | ret = flush_cache_user_range(start, start + chunk); |
| 577 | if (ret) |
| 578 | return ret; |
| 579 | |
| 580 | cond_resched(); |
| 581 | start += chunk; |
| 582 | } while (start < end); |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
Will Deacon | c5102f5 | 2012-04-27 13:08:53 +0100 | [diff] [blame] | 587 | static inline int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | do_cache_op(unsigned long start, unsigned long end, int flags) |
| 589 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | if (end < start || flags) |
Will Deacon | c5102f5 | 2012-04-27 13:08:53 +0100 | [diff] [blame] | 591 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Will Deacon | 97c72d8 | 2012-08-22 11:06:54 +0100 | [diff] [blame] | 593 | if (!access_ok(VERIFY_READ, start, end - start)) |
| 594 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Will Deacon | 28256d6 | 2013-05-13 15:21:49 +0100 | [diff] [blame] | 596 | return __do_cache_op(start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | /* |
| 600 | * Handle all unrecognised system calls. |
| 601 | * 0x9f0000 - 0x9fffff are some more esoteric system calls |
| 602 | */ |
| 603 | #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE) |
| 604 | asmlinkage int arm_syscall(int no, struct pt_regs *regs) |
| 605 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | siginfo_t info; |
| 607 | |
Nicolas Pitre | 3f2829a | 2006-01-14 16:31:29 +0000 | [diff] [blame] | 608 | if ((no >> 16) != (__ARM_NR_BASE>> 16)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | return bad_syscall(no, regs); |
| 610 | |
| 611 | switch (no & 0xffff) { |
| 612 | case 0: /* branch through 0 */ |
| 613 | info.si_signo = SIGSEGV; |
| 614 | info.si_errno = 0; |
| 615 | info.si_code = SEGV_MAPERR; |
| 616 | info.si_addr = NULL; |
| 617 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 618 | arm_notify_die("branch through zero", regs, &info, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return 0; |
| 620 | |
| 621 | case NR(breakpoint): /* SWI BREAK_POINT */ |
| 622 | regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; |
| 623 | ptrace_break(current, regs); |
| 624 | return regs->ARM_r0; |
| 625 | |
| 626 | /* |
| 627 | * Flush a region from virtual address 'r0' to virtual address 'r1' |
| 628 | * _exclusive_. There is no alignment requirement on either address; |
| 629 | * user space does not need to know the hardware cache layout. |
| 630 | * |
| 631 | * r2 contains flags. It should ALWAYS be passed as ZERO until it |
| 632 | * is defined to be something else. For now we ignore it, but may |
| 633 | * the fires of hell burn in your belly if you break this rule. ;) |
| 634 | * |
| 635 | * (at a later date, we may want to allow this call to not flush |
| 636 | * various aspects of the cache. Passing '0' will guarantee that |
| 637 | * everything necessary gets flushed to maintain consistency in |
| 638 | * the specified region). |
| 639 | */ |
| 640 | case NR(cacheflush): |
Will Deacon | c5102f5 | 2012-04-27 13:08:53 +0100 | [diff] [blame] | 641 | return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | case NR(usr26): |
| 644 | if (!(elf_hwcap & HWCAP_26BIT)) |
| 645 | break; |
| 646 | regs->ARM_cpsr &= ~MODE32_BIT; |
| 647 | return regs->ARM_r0; |
| 648 | |
| 649 | case NR(usr32): |
| 650 | if (!(elf_hwcap & HWCAP_26BIT)) |
| 651 | break; |
| 652 | regs->ARM_cpsr |= MODE32_BIT; |
| 653 | return regs->ARM_r0; |
| 654 | |
| 655 | case NR(set_tls): |
Nathan Lynch | fbfb872 | 2014-09-11 02:49:08 +0100 | [diff] [blame] | 656 | set_tls(regs->ARM_r0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | return 0; |
| 658 | |
| 659 | default: |
| 660 | /* Calls 9f00xx..9f07ff are defined to return -ENOSYS |
| 661 | if not implemented, rather than raising SIGILL. This |
| 662 | way the calling program can gracefully determine whether |
| 663 | a feature is supported. */ |
Russell King | bfd2e29 | 2009-11-08 20:05:28 +0000 | [diff] [blame] | 664 | if ((no & 0xffff) <= 0x7ff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return -ENOSYS; |
| 666 | break; |
| 667 | } |
| 668 | #ifdef CONFIG_DEBUG_USER |
| 669 | /* |
| 670 | * experience shows that these seem to indicate that |
| 671 | * something catastrophic has happened |
| 672 | */ |
| 673 | if (user_debug & UDBG_SYSCALL) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 674 | pr_err("[%d] %s: arm syscall %d\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 675 | task_pid_nr(current), current->comm, no); |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 676 | dump_instr("", regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | if (user_mode(regs)) { |
Russell King | 652a12e | 2005-04-17 15:50:36 +0100 | [diff] [blame] | 678 | __show_regs(regs); |
Nikolay Borisov | 49432d4 | 2014-06-03 19:50:09 +0100 | [diff] [blame] | 679 | c_backtrace(frame_pointer(regs), processor_mode(regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | } |
| 682 | #endif |
| 683 | info.si_signo = SIGILL; |
| 684 | info.si_errno = 0; |
| 685 | info.si_code = ILL_ILLTRP; |
| 686 | info.si_addr = (void __user *)instruction_pointer(regs) - |
| 687 | (thumb_mode(regs) ? 2 : 4); |
| 688 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 689 | arm_notify_die("Oops - bad syscall(2)", regs, &info, no, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | return 0; |
| 691 | } |
| 692 | |
Nicolas Pitre | 4b0e07a | 2005-05-05 23:24:45 +0100 | [diff] [blame] | 693 | #ifdef CONFIG_TLS_REG_EMUL |
Nicolas Pitre | 2d2669b | 2005-04-29 22:08:33 +0100 | [diff] [blame] | 694 | |
| 695 | /* |
| 696 | * We might be running on an ARMv6+ processor which should have the TLS |
Nicolas Pitre | 4b0e07a | 2005-05-05 23:24:45 +0100 | [diff] [blame] | 697 | * register but for some reason we can't use it, or maybe an SMP system |
| 698 | * using a pre-ARMv6 processor (there are apparently a few prototypes like |
| 699 | * that in existence) and therefore access to that register must be |
| 700 | * emulated. |
Nicolas Pitre | 2d2669b | 2005-04-29 22:08:33 +0100 | [diff] [blame] | 701 | */ |
| 702 | |
| 703 | static int get_tp_trap(struct pt_regs *regs, unsigned int instr) |
| 704 | { |
| 705 | int reg = (instr >> 12) & 15; |
| 706 | if (reg == 15) |
| 707 | return 1; |
André Hentschel | a4780ad | 2013-06-18 23:23:26 +0100 | [diff] [blame] | 708 | regs->uregs[reg] = current_thread_info()->tp_value[0]; |
Nicolas Pitre | 2d2669b | 2005-04-29 22:08:33 +0100 | [diff] [blame] | 709 | regs->ARM_pc += 4; |
| 710 | return 0; |
| 711 | } |
| 712 | |
| 713 | static struct undef_hook arm_mrc_hook = { |
| 714 | .instr_mask = 0x0fff0fff, |
| 715 | .instr_val = 0x0e1d0f70, |
| 716 | .cpsr_mask = PSR_T_BIT, |
| 717 | .cpsr_val = 0, |
| 718 | .fn = get_tp_trap, |
| 719 | }; |
| 720 | |
| 721 | static int __init arm_mrc_hook_init(void) |
| 722 | { |
| 723 | register_undef_hook(&arm_mrc_hook); |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | late_initcall(arm_mrc_hook_init); |
| 728 | |
| 729 | #endif |
| 730 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | /* |
| 732 | * A data abort trap was taken, but we did not handle the instruction. |
| 733 | * Try to abort the user program, or panic if it was the kernel. |
| 734 | */ |
| 735 | asmlinkage void |
| 736 | baddataabort(int code, unsigned long instr, struct pt_regs *regs) |
| 737 | { |
| 738 | unsigned long addr = instruction_pointer(regs); |
| 739 | siginfo_t info; |
| 740 | |
| 741 | #ifdef CONFIG_DEBUG_USER |
| 742 | if (user_debug & UDBG_BADABORT) { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 743 | pr_err("[%d] %s: bad data abort: code %d instr 0x%08lx\n", |
| 744 | task_pid_nr(current), current->comm, code, instr); |
Russell King | e40c2ec | 2009-10-11 15:17:53 +0100 | [diff] [blame] | 745 | dump_instr(KERN_ERR, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | show_pte(current->mm, addr); |
| 747 | } |
| 748 | #endif |
| 749 | |
| 750 | info.si_signo = SIGILL; |
| 751 | info.si_errno = 0; |
| 752 | info.si_code = ILL_ILLOPC; |
| 753 | info.si_addr = (void __user *)addr; |
| 754 | |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame] | 755 | arm_notify_die("unknown data abort code", regs, &info, instr, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | void __readwrite_bug(const char *fn) |
| 759 | { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 760 | pr_err("%s called, but not implemented\n", fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | BUG(); |
| 762 | } |
| 763 | EXPORT_SYMBOL(__readwrite_bug); |
| 764 | |
Russell King | 69529c0 | 2010-11-16 00:19:55 +0000 | [diff] [blame] | 765 | void __pte_error(const char *file, int line, pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 767 | pr_err("%s:%d: bad pte %08llx.\n", file, line, (long long)pte_val(pte)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
| 769 | |
Russell King | 69529c0 | 2010-11-16 00:19:55 +0000 | [diff] [blame] | 770 | void __pmd_error(const char *file, int line, pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 772 | pr_err("%s:%d: bad pmd %08llx.\n", file, line, (long long)pmd_val(pmd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
| 774 | |
Russell King | 69529c0 | 2010-11-16 00:19:55 +0000 | [diff] [blame] | 775 | void __pgd_error(const char *file, int line, pgd_t pgd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 777 | pr_err("%s:%d: bad pgd %08llx.\n", file, line, (long long)pgd_val(pgd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | } |
| 779 | |
| 780 | asmlinkage void __div0(void) |
| 781 | { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 782 | pr_err("Division by zero in kernel.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | dump_stack(); |
| 784 | } |
| 785 | EXPORT_SYMBOL(__div0); |
| 786 | |
| 787 | void abort(void) |
| 788 | { |
| 789 | BUG(); |
| 790 | |
| 791 | /* if that doesn't kill us, halt */ |
| 792 | panic("Oops failed to kill thread"); |
| 793 | } |
| 794 | EXPORT_SYMBOL(abort); |
| 795 | |
| 796 | void __init trap_init(void) |
| 797 | { |
Jason Wessel | 5cbad0e | 2008-02-20 13:33:40 -0600 | [diff] [blame] | 798 | return; |
| 799 | } |
| 800 | |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 801 | #ifdef CONFIG_KUSER_HELPERS |
| 802 | static void __init kuser_init(void *vectors) |
Tony Lindgren | f159f4e | 2010-07-05 14:53:10 +0100 | [diff] [blame] | 803 | { |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 804 | extern char __kuser_helper_start[], __kuser_helper_end[]; |
| 805 | int kuser_sz = __kuser_helper_end - __kuser_helper_start; |
| 806 | |
| 807 | memcpy(vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz); |
| 808 | |
Tony Lindgren | f159f4e | 2010-07-05 14:53:10 +0100 | [diff] [blame] | 809 | /* |
| 810 | * vectors + 0xfe0 = __kuser_get_tls |
| 811 | * vectors + 0xfe8 = hardware TLS instruction at 0xffff0fe8 |
| 812 | */ |
| 813 | if (tls_emu || has_tls_reg) |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 814 | memcpy(vectors + 0xfe0, vectors + 0xfe8, 4); |
Tony Lindgren | f159f4e | 2010-07-05 14:53:10 +0100 | [diff] [blame] | 815 | } |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 816 | #else |
Olof Johansson | 5761704 | 2013-11-18 06:01:38 +0100 | [diff] [blame] | 817 | static inline void __init kuser_init(void *vectors) |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 818 | { |
| 819 | } |
| 820 | #endif |
Tony Lindgren | f159f4e | 2010-07-05 14:53:10 +0100 | [diff] [blame] | 821 | |
Russell King | 94e5a85 | 2012-01-18 15:32:49 +0000 | [diff] [blame] | 822 | void __init early_trap_init(void *vectors_base) |
Jason Wessel | 5cbad0e | 2008-02-20 13:33:40 -0600 | [diff] [blame] | 823 | { |
Catalin Marinas | 55bdd69 | 2010-05-21 18:06:41 +0100 | [diff] [blame] | 824 | #ifndef CONFIG_CPU_V7M |
Russell King | 94e5a85 | 2012-01-18 15:32:49 +0000 | [diff] [blame] | 825 | unsigned long vectors = (unsigned long)vectors_base; |
Russell King | 7933523 | 2005-04-26 15:17:42 +0100 | [diff] [blame] | 826 | extern char __stubs_start[], __stubs_end[]; |
| 827 | extern char __vectors_start[], __vectors_end[]; |
Russell King | f928d4f | 2013-07-04 11:00:23 +0100 | [diff] [blame] | 828 | unsigned i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Russell King | 94e5a85 | 2012-01-18 15:32:49 +0000 | [diff] [blame] | 830 | vectors_page = vectors_base; |
| 831 | |
Russell King | 7933523 | 2005-04-26 15:17:42 +0100 | [diff] [blame] | 832 | /* |
Russell King | f928d4f | 2013-07-04 11:00:23 +0100 | [diff] [blame] | 833 | * Poison the vectors page with an undefined instruction. This |
| 834 | * instruction is chosen to be undefined for both ARM and Thumb |
| 835 | * ISAs. The Thumb version is an undefined instruction with a |
| 836 | * branch back to the undefined instruction. |
| 837 | */ |
| 838 | for (i = 0; i < PAGE_SIZE / sizeof(u32); i++) |
| 839 | ((u32 *)vectors_base)[i] = 0xe7fddef1; |
| 840 | |
| 841 | /* |
Nicolas Pitre | 2d2669b | 2005-04-29 22:08:33 +0100 | [diff] [blame] | 842 | * Copy the vectors, stubs and kuser helpers (in entry-armv.S) |
| 843 | * into the vector page, mapped at 0xffff0000, and ensure these |
| 844 | * are visible to the instruction stream. |
Russell King | 7933523 | 2005-04-26 15:17:42 +0100 | [diff] [blame] | 845 | */ |
Hyok S. Choi | c760fc1 | 2006-03-27 15:18:50 +0100 | [diff] [blame] | 846 | memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start); |
Russell King | 19accfd | 2013-07-04 11:40:32 +0100 | [diff] [blame] | 847 | memcpy((void *)vectors + 0x1000, __stubs_start, __stubs_end - __stubs_start); |
Russell King | e00d349 | 2005-06-22 20:26:05 +0100 | [diff] [blame] | 848 | |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 849 | kuser_init(vectors_base); |
Tony Lindgren | f159f4e | 2010-07-05 14:53:10 +0100 | [diff] [blame] | 850 | |
Russell King | 19accfd | 2013-07-04 11:40:32 +0100 | [diff] [blame] | 851 | flush_icache_range(vectors, vectors + PAGE_SIZE * 2); |
Catalin Marinas | 55bdd69 | 2010-05-21 18:06:41 +0100 | [diff] [blame] | 852 | #else /* ifndef CONFIG_CPU_V7M */ |
| 853 | /* |
| 854 | * on V7-M there is no need to copy the vector table to a dedicated |
| 855 | * memory area. The address is configurable and so a table in the kernel |
| 856 | * image can be used. |
| 857 | */ |
| 858 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |