Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/process.c |
| 3 | * |
| 4 | * Copyright (C) 1996-2000 Russell King - Converted to ARM. |
| 5 | * Original Copyright (C) 1995 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 | #include <stdarg.h> |
| 12 | |
Paul Gortmaker | ecea4ab | 2011-07-22 10:58:34 -0400 | [diff] [blame] | 13 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/sched.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/mm.h> |
| 17 | #include <linux/stddef.h> |
| 18 | #include <linux/unistd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/user.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/delay.h> |
| 21 | #include <linux/reboot.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/kallsyms.h> |
| 24 | #include <linux/init.h> |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 25 | #include <linux/cpu.h> |
Ben Dooks | 84dff1a | 2006-03-15 23:17:23 +0000 | [diff] [blame] | 26 | #include <linux/elfcore.h> |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 27 | #include <linux/pm.h> |
Kevin Hilman | 9e4559d | 2007-03-14 17:33:24 +0100 | [diff] [blame] | 28 | #include <linux/tick.h> |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 29 | #include <linux/utsname.h> |
Russell King | 33fa9b1 | 2008-09-06 11:35:55 +0100 | [diff] [blame] | 30 | #include <linux/uaccess.h> |
Nicolas Pitre | 990cb8a | 2010-06-14 16:27:19 -0400 | [diff] [blame] | 31 | #include <linux/random.h> |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 32 | #include <linux/hw_breakpoint.h> |
Len Brown | a0bfa13 | 2011-04-01 19:34:59 -0400 | [diff] [blame] | 33 | #include <linux/cpuidle.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Russell King | 9ca03a2 | 2010-07-26 12:22:12 +0100 | [diff] [blame] | 35 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/leds.h> |
| 37 | #include <asm/processor.h> |
Russell King | d6551e8 | 2006-06-21 13:31:52 +0100 | [diff] [blame] | 38 | #include <asm/thread_notify.h> |
Catalin Marinas | 2d7c11b | 2009-02-11 13:07:53 +0100 | [diff] [blame] | 39 | #include <asm/stacktrace.h> |
Russell King | 2ea8339 | 2005-06-27 14:04:05 +0100 | [diff] [blame] | 40 | #include <asm/mach/time.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Nicolas Pitre | c743f38 | 2010-05-24 23:55:42 -0400 | [diff] [blame] | 42 | #ifdef CONFIG_CC_STACKPROTECTOR |
| 43 | #include <linux/stackprotector.h> |
| 44 | unsigned long __stack_chk_guard __read_mostly; |
| 45 | EXPORT_SYMBOL(__stack_chk_guard); |
| 46 | #endif |
| 47 | |
Russell King | ae0a846 | 2007-01-09 12:57:37 +0000 | [diff] [blame] | 48 | static const char *processor_modes[] = { |
| 49 | "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , |
| 50 | "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", |
| 51 | "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" , |
| 52 | "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" |
| 53 | }; |
| 54 | |
George G. Davis | 909d6c6 | 2007-06-26 01:38:27 +0100 | [diff] [blame] | 55 | static const char *isa_modes[] = { |
| 56 | "ARM" , "Thumb" , "Jazelle", "ThumbEE" |
| 57 | }; |
| 58 | |
Russell King | 5aafec1 | 2011-11-01 10:15:27 +0000 | [diff] [blame] | 59 | extern void setup_mm_for_reboot(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | static volatile int hlt_counter; |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | void disable_hlt(void) |
| 64 | { |
| 65 | hlt_counter++; |
| 66 | } |
| 67 | |
| 68 | EXPORT_SYMBOL(disable_hlt); |
| 69 | |
| 70 | void enable_hlt(void) |
| 71 | { |
| 72 | hlt_counter--; |
| 73 | } |
| 74 | |
| 75 | EXPORT_SYMBOL(enable_hlt); |
| 76 | |
| 77 | static int __init nohlt_setup(char *__unused) |
| 78 | { |
| 79 | hlt_counter = 1; |
| 80 | return 1; |
| 81 | } |
| 82 | |
| 83 | static int __init hlt_setup(char *__unused) |
| 84 | { |
| 85 | hlt_counter = 0; |
| 86 | return 1; |
| 87 | } |
| 88 | |
| 89 | __setup("nohlt", nohlt_setup); |
| 90 | __setup("hlt", hlt_setup); |
| 91 | |
Will Deacon | 290130a | 2011-06-06 12:28:54 +0100 | [diff] [blame] | 92 | extern void call_with_stack(void (*fn)(void *), void *arg, void *sp); |
| 93 | typedef void (*phys_reset_t)(unsigned long); |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 94 | |
Will Deacon | 290130a | 2011-06-06 12:28:54 +0100 | [diff] [blame] | 95 | /* |
| 96 | * A temporary stack to use for CPU reset. This is static so that we |
| 97 | * don't clobber it with the identity mapping. When running with this |
| 98 | * stack, any references to the current task *will not work* so you |
| 99 | * should really do as little as possible before jumping to your reset |
| 100 | * code. |
| 101 | */ |
| 102 | static u64 soft_restart_stack[16]; |
| 103 | |
| 104 | static void __soft_restart(void *addr) |
| 105 | { |
| 106 | phys_reset_t phys_reset; |
| 107 | |
| 108 | /* Take out a flat memory mapping. */ |
Russell King | 5aafec1 | 2011-11-01 10:15:27 +0000 | [diff] [blame] | 109 | setup_mm_for_reboot(); |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 110 | |
Russell King | 9ca03a2 | 2010-07-26 12:22:12 +0100 | [diff] [blame] | 111 | /* Clean and invalidate caches */ |
| 112 | flush_cache_all(); |
| 113 | |
| 114 | /* Turn off caching */ |
| 115 | cpu_proc_fin(); |
| 116 | |
| 117 | /* Push out any further dirty data, and ensure cache is empty */ |
| 118 | flush_cache_all(); |
| 119 | |
Will Deacon | 290130a | 2011-06-06 12:28:54 +0100 | [diff] [blame] | 120 | /* Switch to the identity mapping. */ |
| 121 | phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset); |
| 122 | phys_reset((unsigned long)addr); |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 123 | |
Will Deacon | 290130a | 2011-06-06 12:28:54 +0100 | [diff] [blame] | 124 | /* Should never get here. */ |
| 125 | BUG(); |
| 126 | } |
| 127 | |
| 128 | void soft_restart(unsigned long addr) |
| 129 | { |
| 130 | u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack); |
| 131 | |
| 132 | /* Disable interrupts first */ |
| 133 | local_irq_disable(); |
| 134 | local_fiq_disable(); |
| 135 | |
| 136 | /* Disable the L2 if we're the last man standing. */ |
| 137 | if (num_online_cpus() == 1) |
| 138 | outer_disable(); |
| 139 | |
| 140 | /* Change to the new stack and continue with the reset. */ |
| 141 | call_with_stack(__soft_restart, (void *)addr, (void *)stack); |
| 142 | |
| 143 | /* Should never get here. */ |
| 144 | BUG(); |
Russell King | e879c86 | 2011-11-01 13:16:26 +0000 | [diff] [blame] | 145 | } |
| 146 | |
Russell King | f88b897 | 2011-11-05 21:30:00 +0000 | [diff] [blame] | 147 | static void null_restart(char mode, const char *cmd) |
Russell King | e879c86 | 2011-11-01 13:16:26 +0000 | [diff] [blame] | 148 | { |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 149 | } |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /* |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 152 | * Function pointers to optional machine specific functions |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | void (*pm_power_off)(void); |
| 155 | EXPORT_SYMBOL(pm_power_off); |
| 156 | |
Russell King | f88b897 | 2011-11-05 21:30:00 +0000 | [diff] [blame] | 157 | void (*arm_pm_restart)(char str, const char *cmd) = null_restart; |
Richard Purdie | 74617fb | 2006-06-19 19:57:12 +0100 | [diff] [blame] | 158 | EXPORT_SYMBOL_GPL(arm_pm_restart); |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | /* |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 161 | * This is our default idle handler. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | */ |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 163 | |
| 164 | void (*arm_pm_idle)(void); |
| 165 | |
Ben Dooks | 84dff1a | 2006-03-15 23:17:23 +0000 | [diff] [blame] | 166 | static void default_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 168 | if (arm_pm_idle) |
| 169 | arm_pm_idle(); |
| 170 | else |
Nicolas Pitre | ae94091 | 2011-12-19 03:03:58 -0500 | [diff] [blame] | 171 | cpu_do_idle(); |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 172 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 175 | void (*pm_idle)(void) = default_idle; |
| 176 | EXPORT_SYMBOL(pm_idle); |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | /* |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 179 | * The idle thread, has rather strange semantics for calling pm_idle, |
| 180 | * but this is what x86 does and we need to do the same, so that |
| 181 | * things like cpuidle get called in the same way. The only difference |
| 182 | * is that we always respect 'hlt_counter' to prevent low power idle. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | */ |
| 184 | void cpu_idle(void) |
| 185 | { |
| 186 | local_fiq_enable(); |
| 187 | |
| 188 | /* endless idle loop with no priority at all */ |
| 189 | while (1) { |
Frederic Weisbecker | 1268fbc | 2011-11-17 18:48:14 +0100 | [diff] [blame] | 190 | tick_nohz_idle_enter(); |
| 191 | rcu_idle_enter(); |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 192 | leds_event(led_idle_start); |
| 193 | while (!need_resched()) { |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 194 | #ifdef CONFIG_HOTPLUG_CPU |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 195 | if (cpu_is_offline(smp_processor_id())) |
| 196 | cpu_die(); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 197 | #endif |
| 198 | |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 199 | /* |
| 200 | * We need to disable interrupts here |
| 201 | * to ensure we don't miss a wakeup call. |
| 202 | */ |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 203 | local_irq_disable(); |
Will Deacon | 11ed0ba | 2011-11-14 17:24:58 +0100 | [diff] [blame] | 204 | #ifdef CONFIG_PL310_ERRATA_769419 |
| 205 | wmb(); |
| 206 | #endif |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 207 | if (hlt_counter) { |
| 208 | local_irq_enable(); |
| 209 | cpu_relax(); |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 210 | } else if (!need_resched()) { |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 211 | stop_critical_timings(); |
David Brown | cbc158d | 2011-08-04 09:24:31 -0700 | [diff] [blame] | 212 | if (cpuidle_idle_call()) |
Len Brown | a0bfa13 | 2011-04-01 19:34:59 -0400 | [diff] [blame] | 213 | pm_idle(); |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 214 | start_critical_timings(); |
| 215 | /* |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 216 | * pm_idle functions must always |
| 217 | * return with IRQs enabled. |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 218 | */ |
| 219 | WARN_ON(irqs_disabled()); |
Nicolas Pitre | 4fa2043 | 2011-08-01 17:25:06 -0400 | [diff] [blame] | 220 | } else |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 221 | local_irq_enable(); |
Russell King | 9ccdac3 | 2009-06-22 22:34:55 +0100 | [diff] [blame] | 222 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | leds_event(led_idle_end); |
Frederic Weisbecker | 1268fbc | 2011-11-17 18:48:14 +0100 | [diff] [blame] | 224 | rcu_idle_exit(); |
| 225 | tick_nohz_idle_exit(); |
Thomas Gleixner | bd2f553 | 2011-03-21 12:33:18 +0100 | [diff] [blame] | 226 | schedule_preempt_disabled(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | } |
| 229 | |
| 230 | static char reboot_mode = 'h'; |
| 231 | |
| 232 | int __init reboot_setup(char *str) |
| 233 | { |
| 234 | reboot_mode = str[0]; |
| 235 | return 1; |
| 236 | } |
| 237 | |
| 238 | __setup("reboot=", reboot_setup); |
| 239 | |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 240 | void machine_shutdown(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 242 | #ifdef CONFIG_SMP |
| 243 | smp_send_stop(); |
| 244 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 247 | void machine_halt(void) |
| 248 | { |
| 249 | machine_shutdown(); |
Shawn Guo | 98bd8b9 | 2012-07-13 08:19:34 +0100 | [diff] [blame^] | 250 | local_irq_disable(); |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 251 | while (1); |
| 252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | void machine_power_off(void) |
| 255 | { |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 256 | machine_shutdown(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | if (pm_power_off) |
| 258 | pm_power_off(); |
| 259 | } |
| 260 | |
Russell King | be093be | 2009-03-19 16:20:24 +0000 | [diff] [blame] | 261 | void machine_restart(char *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | { |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 263 | machine_shutdown(); |
Russell King | ac15e00 | 2011-10-31 09:22:22 +0000 | [diff] [blame] | 264 | |
Russell King | be093be | 2009-03-19 16:20:24 +0000 | [diff] [blame] | 265 | arm_pm_restart(reboot_mode, cmd); |
Russell King | ac15e00 | 2011-10-31 09:22:22 +0000 | [diff] [blame] | 266 | |
| 267 | /* Give a grace period for failure to restart of 1s */ |
| 268 | mdelay(1000); |
| 269 | |
| 270 | /* Whoops - the platform was unable to reboot. Tell the user! */ |
| 271 | printk("Reboot failed -- System halted\n"); |
Shawn Guo | 98bd8b9 | 2012-07-13 08:19:34 +0100 | [diff] [blame^] | 272 | local_irq_disable(); |
Russell King | ac15e00 | 2011-10-31 09:22:22 +0000 | [diff] [blame] | 273 | while (1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | } |
| 275 | |
Russell King | 652a12e | 2005-04-17 15:50:36 +0100 | [diff] [blame] | 276 | void __show_regs(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | { |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 278 | unsigned long flags; |
| 279 | char buf[64]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 281 | printk("CPU: %d %s (%s %.*s)\n", |
Rabin Vincent | 2232552 | 2010-01-08 16:59:34 +0100 | [diff] [blame] | 282 | raw_smp_processor_id(), print_tainted(), |
| 283 | init_utsname()->release, |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 284 | (int)strcspn(init_utsname()->version, " "), |
| 285 | init_utsname()->version); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
| 287 | print_symbol("LR is at %s\n", regs->ARM_lr); |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 288 | printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | "sp : %08lx ip : %08lx fp : %08lx\n", |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 290 | regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr, |
| 291 | regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | printk("r10: %08lx r9 : %08lx r8 : %08lx\n", |
| 293 | regs->ARM_r10, regs->ARM_r9, |
| 294 | regs->ARM_r8); |
| 295 | printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", |
| 296 | regs->ARM_r7, regs->ARM_r6, |
| 297 | regs->ARM_r5, regs->ARM_r4); |
| 298 | printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", |
| 299 | regs->ARM_r3, regs->ARM_r2, |
| 300 | regs->ARM_r1, regs->ARM_r0); |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 301 | |
| 302 | flags = regs->ARM_cpsr; |
| 303 | buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; |
| 304 | buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; |
| 305 | buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; |
| 306 | buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; |
| 307 | buf[4] = '\0'; |
| 308 | |
George G. Davis | 909d6c6 | 2007-06-26 01:38:27 +0100 | [diff] [blame] | 309 | printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 310 | buf, interrupts_enabled(regs) ? "n" : "ff", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | fast_interrupts_enabled(regs) ? "n" : "ff", |
| 312 | processor_modes[processor_mode(regs)], |
George G. Davis | 909d6c6 | 2007-06-26 01:38:27 +0100 | [diff] [blame] | 313 | isa_modes[isa_mode(regs)], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | get_fs() == get_ds() ? "kernel" : "user"); |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 315 | #ifdef CONFIG_CPU_CP15 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | { |
Hyok S. Choi | f12d0d7 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 317 | unsigned int ctrl; |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 318 | |
| 319 | buf[0] = '\0'; |
Hyok S. Choi | f12d0d7 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 320 | #ifdef CONFIG_CPU_CP15_MMU |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 321 | { |
| 322 | unsigned int transbase, dac; |
| 323 | asm("mrc p15, 0, %0, c2, c0\n\t" |
| 324 | "mrc p15, 0, %1, c3, c0\n" |
| 325 | : "=r" (transbase), "=r" (dac)); |
| 326 | snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", |
| 327 | transbase, dac); |
| 328 | } |
Hyok S. Choi | f12d0d7 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 329 | #endif |
Russell King | 154c772 | 2007-06-18 14:59:45 +0100 | [diff] [blame] | 330 | asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); |
| 331 | |
| 332 | printk("Control: %08x%s\n", ctrl, buf); |
| 333 | } |
Hyok S. Choi | f12d0d7 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 334 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } |
| 336 | |
Russell King | 652a12e | 2005-04-17 15:50:36 +0100 | [diff] [blame] | 337 | void show_regs(struct pt_regs * regs) |
| 338 | { |
| 339 | printk("\n"); |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 340 | printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm); |
Russell King | 652a12e | 2005-04-17 15:50:36 +0100 | [diff] [blame] | 341 | __show_regs(regs); |
Laura Abbott | b380ab4 | 2011-08-31 02:04:06 +0100 | [diff] [blame] | 342 | dump_stack(); |
Russell King | 652a12e | 2005-04-17 15:50:36 +0100 | [diff] [blame] | 343 | } |
| 344 | |
Russell King | 797245f | 2009-12-18 14:34:43 +0000 | [diff] [blame] | 345 | ATOMIC_NOTIFIER_HEAD(thread_notify_head); |
| 346 | |
| 347 | EXPORT_SYMBOL_GPL(thread_notify_head); |
| 348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | * Free current thread data structures etc.. |
| 351 | */ |
| 352 | void exit_thread(void) |
| 353 | { |
Russell King | 797245f | 2009-12-18 14:34:43 +0000 | [diff] [blame] | 354 | thread_notify(THREAD_NOTIFY_EXIT, current_thread_info()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | void flush_thread(void) |
| 358 | { |
| 359 | struct thread_info *thread = current_thread_info(); |
| 360 | struct task_struct *tsk = current; |
| 361 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 362 | flush_ptrace_hw_breakpoint(tsk); |
| 363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | memset(thread->used_cp, 0, sizeof(thread->used_cp)); |
| 365 | memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); |
Russell King | d6551e8 | 2006-06-21 13:31:52 +0100 | [diff] [blame] | 366 | memset(&thread->fpstate, 0, sizeof(union fp_state)); |
| 367 | |
| 368 | thread_notify(THREAD_NOTIFY_FLUSH, thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | void release_thread(struct task_struct *dead_task) |
| 372 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); |
| 376 | |
| 377 | int |
Alexey Dobriyan | 6f2c55b | 2009-04-02 16:56:59 -0700 | [diff] [blame] | 378 | copy_thread(unsigned long clone_flags, unsigned long stack_start, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs) |
| 380 | { |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 381 | struct thread_info *thread = task_thread_info(p); |
| 382 | struct pt_regs *childregs = task_pt_regs(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | *childregs = *regs; |
| 385 | childregs->ARM_r0 = 0; |
| 386 | childregs->ARM_sp = stack_start; |
| 387 | |
| 388 | memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); |
| 389 | thread->cpu_context.sp = (unsigned long)childregs; |
| 390 | thread->cpu_context.pc = (unsigned long)ret_from_fork; |
| 391 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 392 | clear_ptrace_hw_breakpoint(p); |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | if (clone_flags & CLONE_SETTLS) |
| 395 | thread->tp_value = regs->ARM_r3; |
| 396 | |
Catalin Marinas | 2e82669a | 2011-04-06 16:16:29 +0100 | [diff] [blame] | 397 | thread_notify(THREAD_NOTIFY_COPY, thread); |
| 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | /* |
Artem Bityutskiy | cde3f86 | 2009-10-13 08:54:30 +0100 | [diff] [blame] | 403 | * Fill in the task's elfregs structure for a core dump. |
| 404 | */ |
| 405 | int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs) |
| 406 | { |
| 407 | elf_core_copy_regs(elfregs, task_pt_regs(t)); |
| 408 | return 1; |
| 409 | } |
| 410 | |
| 411 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | * fill in the fpe structure for a core dump... |
| 413 | */ |
| 414 | int dump_fpu (struct pt_regs *regs, struct user_fp *fp) |
| 415 | { |
| 416 | struct thread_info *thread = current_thread_info(); |
| 417 | int used_math = thread->used_cp[1] | thread->used_cp[2]; |
| 418 | |
| 419 | if (used_math) |
| 420 | memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); |
| 421 | |
| 422 | return used_math != 0; |
| 423 | } |
| 424 | EXPORT_SYMBOL(dump_fpu); |
| 425 | |
| 426 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | * Shuffle the argument into the correct register before calling the |
Russell King | ac78884 | 2010-07-10 10:10:18 +0100 | [diff] [blame] | 428 | * thread function. r4 is the thread argument, r5 is the pointer to |
| 429 | * the thread function, and r6 points to the exit function. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | */ |
| 431 | extern void kernel_thread_helper(void); |
Russell King | 4260415 | 2010-04-19 10:15:03 +0100 | [diff] [blame] | 432 | asm( ".pushsection .text\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | " .align\n" |
| 434 | " .type kernel_thread_helper, #function\n" |
| 435 | "kernel_thread_helper:\n" |
Russell King | ac78884 | 2010-07-10 10:10:18 +0100 | [diff] [blame] | 436 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 437 | " bl trace_hardirqs_on\n" |
| 438 | #endif |
| 439 | " msr cpsr_c, r7\n" |
| 440 | " mov r0, r4\n" |
| 441 | " mov lr, r6\n" |
| 442 | " mov pc, r5\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | " .size kernel_thread_helper, . - kernel_thread_helper\n" |
Russell King | 4260415 | 2010-04-19 10:15:03 +0100 | [diff] [blame] | 444 | " .popsection"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Catalin Marinas | feb97c3 | 2009-06-19 16:43:08 +0100 | [diff] [blame] | 446 | #ifdef CONFIG_ARM_UNWIND |
| 447 | extern void kernel_thread_exit(long code); |
Russell King | 4260415 | 2010-04-19 10:15:03 +0100 | [diff] [blame] | 448 | asm( ".pushsection .text\n" |
Catalin Marinas | feb97c3 | 2009-06-19 16:43:08 +0100 | [diff] [blame] | 449 | " .align\n" |
| 450 | " .type kernel_thread_exit, #function\n" |
| 451 | "kernel_thread_exit:\n" |
| 452 | " .fnstart\n" |
| 453 | " .cantunwind\n" |
| 454 | " bl do_exit\n" |
| 455 | " nop\n" |
| 456 | " .fnend\n" |
| 457 | " .size kernel_thread_exit, . - kernel_thread_exit\n" |
Russell King | 4260415 | 2010-04-19 10:15:03 +0100 | [diff] [blame] | 458 | " .popsection"); |
Catalin Marinas | feb97c3 | 2009-06-19 16:43:08 +0100 | [diff] [blame] | 459 | #else |
| 460 | #define kernel_thread_exit do_exit |
| 461 | #endif |
| 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | /* |
| 464 | * Create a kernel thread. |
| 465 | */ |
| 466 | pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) |
| 467 | { |
| 468 | struct pt_regs regs; |
| 469 | |
| 470 | memset(®s, 0, sizeof(regs)); |
| 471 | |
Russell King | ac78884 | 2010-07-10 10:10:18 +0100 | [diff] [blame] | 472 | regs.ARM_r4 = (unsigned long)arg; |
| 473 | regs.ARM_r5 = (unsigned long)fn; |
| 474 | regs.ARM_r6 = (unsigned long)kernel_thread_exit; |
| 475 | regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | regs.ARM_pc = (unsigned long)kernel_thread_helper; |
Russell King | ac78884 | 2010-07-10 10:10:18 +0100 | [diff] [blame] | 477 | regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); |
| 480 | } |
| 481 | EXPORT_SYMBOL(kernel_thread); |
| 482 | |
| 483 | unsigned long get_wchan(struct task_struct *p) |
| 484 | { |
Catalin Marinas | 2d7c11b | 2009-02-11 13:07:53 +0100 | [diff] [blame] | 485 | struct stackframe frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | int count = 0; |
| 487 | if (!p || p == current || p->state == TASK_RUNNING) |
| 488 | return 0; |
| 489 | |
Catalin Marinas | 2d7c11b | 2009-02-11 13:07:53 +0100 | [diff] [blame] | 490 | frame.fp = thread_saved_fp(p); |
| 491 | frame.sp = thread_saved_sp(p); |
| 492 | frame.lr = 0; /* recovered from the stack */ |
| 493 | frame.pc = thread_saved_pc(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | do { |
Catalin Marinas | 2d7c11b | 2009-02-11 13:07:53 +0100 | [diff] [blame] | 495 | int ret = unwind_frame(&frame); |
| 496 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | return 0; |
Catalin Marinas | 2d7c11b | 2009-02-11 13:07:53 +0100 | [diff] [blame] | 498 | if (!in_sched_functions(frame.pc)) |
| 499 | return frame.pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } while (count ++ < 16); |
| 501 | return 0; |
| 502 | } |
Nicolas Pitre | 990cb8a | 2010-06-14 16:27:19 -0400 | [diff] [blame] | 503 | |
| 504 | unsigned long arch_randomize_brk(struct mm_struct *mm) |
| 505 | { |
| 506 | unsigned long range_end = mm->brk + 0x02000000; |
| 507 | return randomize_range(mm->brk, range_end, 0) ? : mm->brk; |
| 508 | } |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 509 | |
Will Deacon | 6cde6d4 | 2011-01-11 14:04:36 +0100 | [diff] [blame] | 510 | #ifdef CONFIG_MMU |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 511 | /* |
| 512 | * The vectors page is always readable from user space for the |
Will Deacon | f9d4861 | 2012-01-20 12:01:13 +0100 | [diff] [blame] | 513 | * atomic helpers and the signal restart code. Insert it into the |
| 514 | * gate_vma so that it is visible through ptrace and /proc/<pid>/mem. |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 515 | */ |
Will Deacon | f9d4861 | 2012-01-20 12:01:13 +0100 | [diff] [blame] | 516 | static struct vm_area_struct gate_vma; |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 517 | |
Will Deacon | f9d4861 | 2012-01-20 12:01:13 +0100 | [diff] [blame] | 518 | static int __init gate_vma_init(void) |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 519 | { |
Will Deacon | f9d4861 | 2012-01-20 12:01:13 +0100 | [diff] [blame] | 520 | gate_vma.vm_start = 0xffff0000; |
| 521 | gate_vma.vm_end = 0xffff0000 + PAGE_SIZE; |
| 522 | gate_vma.vm_page_prot = PAGE_READONLY_EXEC; |
| 523 | gate_vma.vm_flags = VM_READ | VM_EXEC | |
Linus Torvalds | 12679a2 | 2012-03-29 16:53:48 -0700 | [diff] [blame] | 524 | VM_MAYREAD | VM_MAYEXEC; |
Will Deacon | f9d4861 | 2012-01-20 12:01:13 +0100 | [diff] [blame] | 525 | return 0; |
| 526 | } |
| 527 | arch_initcall(gate_vma_init); |
| 528 | |
| 529 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
| 530 | { |
| 531 | return &gate_vma; |
| 532 | } |
| 533 | |
| 534 | int in_gate_area(struct mm_struct *mm, unsigned long addr) |
| 535 | { |
| 536 | return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end); |
| 537 | } |
| 538 | |
| 539 | int in_gate_area_no_mm(unsigned long addr) |
| 540 | { |
| 541 | return in_gate_area(NULL, addr); |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 545 | { |
Will Deacon | f9d4861 | 2012-01-20 12:01:13 +0100 | [diff] [blame] | 546 | return (vma == &gate_vma) ? "[vectors]" : NULL; |
Nicolas Pitre | ec706da | 2010-08-26 23:10:50 -0400 | [diff] [blame] | 547 | } |
Will Deacon | 6cde6d4 | 2011-01-11 14:04:36 +0100 | [diff] [blame] | 548 | #endif |