2005-04-17 05:20:36 +07:00
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/*
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* linux/arch/arm/kernel/process.c
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*
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* Copyright (C) 1996-2000 Russell King - Converted to ARM.
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* Original Copyright (C) 1995 Linus Torvalds
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <stdarg.h>
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2011-07-22 21:58:34 +07:00
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#include <linux/export.h>
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2005-04-17 05:20:36 +07:00
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/user.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/interrupt.h>
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#include <linux/kallsyms.h>
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#include <linux/init.h>
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2005-11-03 05:24:33 +07:00
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#include <linux/cpu.h>
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2006-03-16 06:17:23 +07:00
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#include <linux/elfcore.h>
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2006-06-20 01:57:12 +07:00
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#include <linux/pm.h>
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2007-03-14 23:33:24 +07:00
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#include <linux/tick.h>
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2007-06-18 20:59:45 +07:00
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#include <linux/utsname.h>
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2008-09-06 17:35:55 +07:00
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#include <linux/uaccess.h>
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2010-06-15 03:27:19 +07:00
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#include <linux/random.h>
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2010-09-03 16:42:55 +07:00
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#include <linux/hw_breakpoint.h>
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2011-04-02 06:34:59 +07:00
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#include <linux/cpuidle.h>
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2005-04-17 05:20:36 +07:00
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2010-07-26 18:22:12 +07:00
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#include <asm/cacheflush.h>
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2005-04-17 05:20:36 +07:00
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#include <asm/leds.h>
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#include <asm/processor.h>
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2006-06-21 19:31:52 +07:00
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#include <asm/thread_notify.h>
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2009-02-11 19:07:53 +07:00
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#include <asm/stacktrace.h>
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2005-06-27 20:04:05 +07:00
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#include <asm/mach/time.h>
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2005-04-17 05:20:36 +07:00
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2010-05-25 10:55:42 +07:00
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#ifdef CONFIG_CC_STACKPROTECTOR
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#include <linux/stackprotector.h>
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unsigned long __stack_chk_guard __read_mostly;
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EXPORT_SYMBOL(__stack_chk_guard);
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#endif
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2007-01-09 19:57:37 +07:00
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static const char *processor_modes[] = {
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"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
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"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
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"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
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"UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
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};
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2007-06-26 07:38:27 +07:00
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static const char *isa_modes[] = {
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"ARM" , "Thumb" , "Jazelle", "ThumbEE"
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};
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2011-11-01 17:15:27 +07:00
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extern void setup_mm_for_reboot(void);
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2005-04-17 05:20:36 +07:00
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static volatile int hlt_counter;
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void disable_hlt(void)
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{
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hlt_counter++;
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}
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EXPORT_SYMBOL(disable_hlt);
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void enable_hlt(void)
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{
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hlt_counter--;
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}
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EXPORT_SYMBOL(enable_hlt);
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static int __init nohlt_setup(char *__unused)
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{
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hlt_counter = 1;
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return 1;
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}
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static int __init hlt_setup(char *__unused)
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{
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hlt_counter = 0;
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return 1;
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}
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__setup("nohlt", nohlt_setup);
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__setup("hlt", hlt_setup);
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2011-06-06 18:28:54 +07:00
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extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
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typedef void (*phys_reset_t)(unsigned long);
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/*
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* A temporary stack to use for CPU reset. This is static so that we
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* don't clobber it with the identity mapping. When running with this
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* stack, any references to the current task *will not work* so you
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* should really do as little as possible before jumping to your reset
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* code.
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*/
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static u64 soft_restart_stack[16];
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static void __soft_restart(void *addr)
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2006-06-20 01:57:12 +07:00
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{
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2011-06-06 18:28:54 +07:00
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phys_reset_t phys_reset;
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2006-06-20 01:57:12 +07:00
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2011-06-06 18:28:54 +07:00
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/* Take out a flat memory mapping. */
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2011-11-01 17:15:27 +07:00
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setup_mm_for_reboot();
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2006-06-20 01:57:12 +07:00
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2010-07-26 18:22:12 +07:00
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/* Clean and invalidate caches */
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flush_cache_all();
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/* Turn off caching */
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cpu_proc_fin();
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/* Push out any further dirty data, and ensure cache is empty */
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flush_cache_all();
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2011-06-06 18:28:54 +07:00
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/* Switch to the identity mapping. */
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phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
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phys_reset((unsigned long)addr);
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2006-06-20 01:57:12 +07:00
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2011-06-06 18:28:54 +07:00
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/* Should never get here. */
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BUG();
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}
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void soft_restart(unsigned long addr)
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{
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u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
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/* Disable interrupts first */
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local_irq_disable();
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local_fiq_disable();
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/* Disable the L2 if we're the last man standing. */
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if (num_online_cpus() == 1)
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outer_disable();
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/* Change to the new stack and continue with the reset. */
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call_with_stack(__soft_restart, (void *)addr, (void *)stack);
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/* Should never get here. */
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BUG();
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2011-11-01 20:16:26 +07:00
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}
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2011-11-06 04:30:00 +07:00
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static void null_restart(char mode, const char *cmd)
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2011-11-01 20:16:26 +07:00
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{
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2006-06-20 01:57:12 +07:00
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}
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2005-04-17 05:20:36 +07:00
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/*
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2006-06-20 01:57:12 +07:00
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* Function pointers to optional machine specific functions
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2005-04-17 05:20:36 +07:00
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*/
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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2011-11-06 04:30:00 +07:00
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void (*arm_pm_restart)(char str, const char *cmd) = null_restart;
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2006-06-20 01:57:12 +07:00
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EXPORT_SYMBOL_GPL(arm_pm_restart);
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2010-10-02 04:13:47 +07:00
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static void do_nothing(void *unused)
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{
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}
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/*
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* cpu_idle_wait - Used to ensure that all the CPUs discard old value of
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* pm_idle and update to new pm_idle value. Required while changing pm_idle
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* handler on SMP systems.
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*
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* Caller must have changed pm_idle to the new value before the call. Old
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* pm_idle value will not be used by any CPU after the return of this function.
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*/
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void cpu_idle_wait(void)
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{
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smp_mb();
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/* kick all the CPUs so that they exit out of pm_idle */
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smp_call_function(do_nothing, NULL, 1);
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}
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EXPORT_SYMBOL_GPL(cpu_idle_wait);
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2006-06-20 01:57:12 +07:00
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2005-04-17 05:20:36 +07:00
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/*
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2011-08-02 04:25:06 +07:00
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* This is our default idle handler.
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2005-04-17 05:20:36 +07:00
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*/
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2011-08-02 04:25:06 +07:00
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void (*arm_pm_idle)(void);
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2006-03-16 06:17:23 +07:00
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static void default_idle(void)
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2005-04-17 05:20:36 +07:00
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{
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2011-08-02 04:25:06 +07:00
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if (arm_pm_idle)
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arm_pm_idle();
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else
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2011-12-19 15:03:58 +07:00
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cpu_do_idle();
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2009-06-23 04:34:55 +07:00
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local_irq_enable();
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2005-04-17 05:20:36 +07:00
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}
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2009-06-23 04:34:55 +07:00
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void (*pm_idle)(void) = default_idle;
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EXPORT_SYMBOL(pm_idle);
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2005-04-17 05:20:36 +07:00
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/*
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2009-06-23 04:34:55 +07:00
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* The idle thread, has rather strange semantics for calling pm_idle,
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* but this is what x86 does and we need to do the same, so that
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* things like cpuidle get called in the same way. The only difference
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* is that we always respect 'hlt_counter' to prevent low power idle.
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2005-04-17 05:20:36 +07:00
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*/
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void cpu_idle(void)
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{
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local_fiq_enable();
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/* endless idle loop with no priority at all */
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while (1) {
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2011-11-18 00:48:14 +07:00
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tick_nohz_idle_enter();
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rcu_idle_enter();
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2009-06-23 04:34:55 +07:00
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leds_event(led_idle_start);
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while (!need_resched()) {
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2005-11-03 05:24:33 +07:00
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#ifdef CONFIG_HOTPLUG_CPU
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2009-06-23 04:34:55 +07:00
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if (cpu_is_offline(smp_processor_id()))
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cpu_die();
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2005-11-03 05:24:33 +07:00
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#endif
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2011-08-02 04:25:06 +07:00
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/*
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* We need to disable interrupts here
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* to ensure we don't miss a wakeup call.
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*/
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2009-06-23 04:34:55 +07:00
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local_irq_disable();
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2011-11-14 23:24:58 +07:00
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#ifdef CONFIG_PL310_ERRATA_769419
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wmb();
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#endif
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2009-06-23 04:34:55 +07:00
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if (hlt_counter) {
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local_irq_enable();
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cpu_relax();
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2011-08-02 04:25:06 +07:00
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} else if (!need_resched()) {
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2009-06-23 04:34:55 +07:00
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stop_critical_timings();
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2011-08-04 23:24:31 +07:00
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if (cpuidle_idle_call())
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2011-04-02 06:34:59 +07:00
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pm_idle();
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2009-06-23 04:34:55 +07:00
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start_critical_timings();
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/*
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2011-08-02 04:25:06 +07:00
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* pm_idle functions must always
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* return with IRQs enabled.
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2009-06-23 04:34:55 +07:00
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*/
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WARN_ON(irqs_disabled());
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2011-08-02 04:25:06 +07:00
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} else
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2009-06-23 04:34:55 +07:00
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local_irq_enable();
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}
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2005-04-17 05:20:36 +07:00
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leds_event(led_idle_end);
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2011-11-18 00:48:14 +07:00
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rcu_idle_exit();
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tick_nohz_idle_exit();
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2011-03-21 18:33:18 +07:00
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schedule_preempt_disabled();
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2005-04-17 05:20:36 +07:00
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}
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}
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static char reboot_mode = 'h';
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int __init reboot_setup(char *str)
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{
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reboot_mode = str[0];
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return 1;
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}
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__setup("reboot=", reboot_setup);
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2010-07-26 19:31:27 +07:00
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void machine_shutdown(void)
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2005-04-17 05:20:36 +07:00
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{
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2010-07-26 19:31:27 +07:00
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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2005-04-17 05:20:36 +07:00
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}
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2010-07-26 19:31:27 +07:00
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void machine_halt(void)
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{
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machine_shutdown();
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while (1);
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}
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2005-04-17 05:20:36 +07:00
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void machine_power_off(void)
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{
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2010-07-26 19:31:27 +07:00
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machine_shutdown();
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2005-04-17 05:20:36 +07:00
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if (pm_power_off)
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pm_power_off();
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}
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2009-03-19 23:20:24 +07:00
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void machine_restart(char *cmd)
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2005-04-17 05:20:36 +07:00
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{
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2010-07-26 19:31:27 +07:00
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machine_shutdown();
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2011-10-31 16:22:22 +07:00
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2009-03-19 23:20:24 +07:00
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arm_pm_restart(reboot_mode, cmd);
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2011-10-31 16:22:22 +07:00
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/* Give a grace period for failure to restart of 1s */
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mdelay(1000);
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/* Whoops - the platform was unable to reboot. Tell the user! */
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printk("Reboot failed -- System halted\n");
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while (1);
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2005-04-17 05:20:36 +07:00
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}
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2005-04-17 21:50:36 +07:00
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void __show_regs(struct pt_regs *regs)
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2005-04-17 05:20:36 +07:00
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{
|
2007-06-18 20:59:45 +07:00
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unsigned long flags;
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char buf[64];
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2005-04-17 05:20:36 +07:00
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2007-06-18 20:59:45 +07:00
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printk("CPU: %d %s (%s %.*s)\n",
|
2010-01-08 22:59:34 +07:00
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raw_smp_processor_id(), print_tainted(),
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init_utsname()->release,
|
2007-06-18 20:59:45 +07:00
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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2005-04-17 05:20:36 +07:00
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print_symbol("PC is at %s\n", instruction_pointer(regs));
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print_symbol("LR is at %s\n", regs->ARM_lr);
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2007-06-18 20:59:45 +07:00
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printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
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2005-04-17 05:20:36 +07:00
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"sp : %08lx ip : %08lx fp : %08lx\n",
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2007-06-18 20:59:45 +07:00
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regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
|
|
|
|
regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
|
2005-04-17 05:20:36 +07:00
|
|
|
printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
|
|
|
|
regs->ARM_r10, regs->ARM_r9,
|
|
|
|
regs->ARM_r8);
|
|
|
|
printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
|
|
|
|
regs->ARM_r7, regs->ARM_r6,
|
|
|
|
regs->ARM_r5, regs->ARM_r4);
|
|
|
|
printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
|
|
|
|
regs->ARM_r3, regs->ARM_r2,
|
|
|
|
regs->ARM_r1, regs->ARM_r0);
|
2007-06-18 20:59:45 +07:00
|
|
|
|
|
|
|
flags = regs->ARM_cpsr;
|
|
|
|
buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
|
|
|
|
buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
|
|
|
|
buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
|
|
|
|
buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
|
|
|
|
buf[4] = '\0';
|
|
|
|
|
2007-06-26 07:38:27 +07:00
|
|
|
printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
|
2007-06-18 20:59:45 +07:00
|
|
|
buf, interrupts_enabled(regs) ? "n" : "ff",
|
2005-04-17 05:20:36 +07:00
|
|
|
fast_interrupts_enabled(regs) ? "n" : "ff",
|
|
|
|
processor_modes[processor_mode(regs)],
|
2007-06-26 07:38:27 +07:00
|
|
|
isa_modes[isa_mode(regs)],
|
2005-04-17 05:20:36 +07:00
|
|
|
get_fs() == get_ds() ? "kernel" : "user");
|
2007-06-18 20:59:45 +07:00
|
|
|
#ifdef CONFIG_CPU_CP15
|
2005-04-17 05:20:36 +07:00
|
|
|
{
|
2006-09-26 15:36:37 +07:00
|
|
|
unsigned int ctrl;
|
2007-06-18 20:59:45 +07:00
|
|
|
|
|
|
|
buf[0] = '\0';
|
2006-09-26 15:36:37 +07:00
|
|
|
#ifdef CONFIG_CPU_CP15_MMU
|
2007-06-18 20:59:45 +07:00
|
|
|
{
|
|
|
|
unsigned int transbase, dac;
|
|
|
|
asm("mrc p15, 0, %0, c2, c0\n\t"
|
|
|
|
"mrc p15, 0, %1, c3, c0\n"
|
|
|
|
: "=r" (transbase), "=r" (dac));
|
|
|
|
snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
|
|
|
|
transbase, dac);
|
|
|
|
}
|
2006-09-26 15:36:37 +07:00
|
|
|
#endif
|
2007-06-18 20:59:45 +07:00
|
|
|
asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
|
|
|
|
|
|
|
|
printk("Control: %08x%s\n", ctrl, buf);
|
|
|
|
}
|
2006-09-26 15:36:37 +07:00
|
|
|
#endif
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
2005-04-17 21:50:36 +07:00
|
|
|
void show_regs(struct pt_regs * regs)
|
|
|
|
{
|
|
|
|
printk("\n");
|
2007-10-19 13:40:41 +07:00
|
|
|
printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
|
2005-04-17 21:50:36 +07:00
|
|
|
__show_regs(regs);
|
2011-08-31 08:04:06 +07:00
|
|
|
dump_stack();
|
2005-04-17 21:50:36 +07:00
|
|
|
}
|
|
|
|
|
2009-12-18 21:34:43 +07:00
|
|
|
ATOMIC_NOTIFIER_HEAD(thread_notify_head);
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(thread_notify_head);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/*
|
|
|
|
* Free current thread data structures etc..
|
|
|
|
*/
|
|
|
|
void exit_thread(void)
|
|
|
|
{
|
2009-12-18 21:34:43 +07:00
|
|
|
thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
void flush_thread(void)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = current_thread_info();
|
|
|
|
struct task_struct *tsk = current;
|
|
|
|
|
2010-09-03 16:42:55 +07:00
|
|
|
flush_ptrace_hw_breakpoint(tsk);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
memset(thread->used_cp, 0, sizeof(thread->used_cp));
|
|
|
|
memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
|
2006-06-21 19:31:52 +07:00
|
|
|
memset(&thread->fpstate, 0, sizeof(union fp_state));
|
|
|
|
|
|
|
|
thread_notify(THREAD_NOTIFY_FLUSH, thread);
|
2005-04-17 05:20:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
|
|
|
|
|
|
|
|
int
|
2009-04-03 06:56:59 +07:00
|
|
|
copy_thread(unsigned long clone_flags, unsigned long stack_start,
|
2005-04-17 05:20:36 +07:00
|
|
|
unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
|
|
|
|
{
|
2006-01-12 16:05:57 +07:00
|
|
|
struct thread_info *thread = task_thread_info(p);
|
|
|
|
struct pt_regs *childregs = task_pt_regs(p);
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
*childregs = *regs;
|
|
|
|
childregs->ARM_r0 = 0;
|
|
|
|
childregs->ARM_sp = stack_start;
|
|
|
|
|
|
|
|
memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
|
|
|
|
thread->cpu_context.sp = (unsigned long)childregs;
|
|
|
|
thread->cpu_context.pc = (unsigned long)ret_from_fork;
|
|
|
|
|
2010-09-03 16:42:55 +07:00
|
|
|
clear_ptrace_hw_breakpoint(p);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
if (clone_flags & CLONE_SETTLS)
|
|
|
|
thread->tp_value = regs->ARM_r3;
|
|
|
|
|
2011-04-06 22:16:29 +07:00
|
|
|
thread_notify(THREAD_NOTIFY_COPY, thread);
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-10-13 14:54:30 +07:00
|
|
|
/*
|
|
|
|
* Fill in the task's elfregs structure for a core dump.
|
|
|
|
*/
|
|
|
|
int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
|
|
|
|
{
|
|
|
|
elf_core_copy_regs(elfregs, task_pt_regs(t));
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/*
|
|
|
|
* fill in the fpe structure for a core dump...
|
|
|
|
*/
|
|
|
|
int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = current_thread_info();
|
|
|
|
int used_math = thread->used_cp[1] | thread->used_cp[2];
|
|
|
|
|
|
|
|
if (used_math)
|
|
|
|
memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
|
|
|
|
|
|
|
|
return used_math != 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(dump_fpu);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Shuffle the argument into the correct register before calling the
|
2010-07-10 16:10:18 +07:00
|
|
|
* thread function. r4 is the thread argument, r5 is the pointer to
|
|
|
|
* the thread function, and r6 points to the exit function.
|
2005-04-17 05:20:36 +07:00
|
|
|
*/
|
|
|
|
extern void kernel_thread_helper(void);
|
2010-04-19 16:15:03 +07:00
|
|
|
asm( ".pushsection .text\n"
|
2005-04-17 05:20:36 +07:00
|
|
|
" .align\n"
|
|
|
|
" .type kernel_thread_helper, #function\n"
|
|
|
|
"kernel_thread_helper:\n"
|
2010-07-10 16:10:18 +07:00
|
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
|
|
" bl trace_hardirqs_on\n"
|
|
|
|
#endif
|
|
|
|
" msr cpsr_c, r7\n"
|
|
|
|
" mov r0, r4\n"
|
|
|
|
" mov lr, r6\n"
|
|
|
|
" mov pc, r5\n"
|
2005-04-17 05:20:36 +07:00
|
|
|
" .size kernel_thread_helper, . - kernel_thread_helper\n"
|
2010-04-19 16:15:03 +07:00
|
|
|
" .popsection");
|
2005-04-17 05:20:36 +07:00
|
|
|
|
2009-06-19 22:43:08 +07:00
|
|
|
#ifdef CONFIG_ARM_UNWIND
|
|
|
|
extern void kernel_thread_exit(long code);
|
2010-04-19 16:15:03 +07:00
|
|
|
asm( ".pushsection .text\n"
|
2009-06-19 22:43:08 +07:00
|
|
|
" .align\n"
|
|
|
|
" .type kernel_thread_exit, #function\n"
|
|
|
|
"kernel_thread_exit:\n"
|
|
|
|
" .fnstart\n"
|
|
|
|
" .cantunwind\n"
|
|
|
|
" bl do_exit\n"
|
|
|
|
" nop\n"
|
|
|
|
" .fnend\n"
|
|
|
|
" .size kernel_thread_exit, . - kernel_thread_exit\n"
|
2010-04-19 16:15:03 +07:00
|
|
|
" .popsection");
|
2009-06-19 22:43:08 +07:00
|
|
|
#else
|
|
|
|
#define kernel_thread_exit do_exit
|
|
|
|
#endif
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/*
|
|
|
|
* Create a kernel thread.
|
|
|
|
*/
|
|
|
|
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
|
|
|
|
{
|
|
|
|
struct pt_regs regs;
|
|
|
|
|
|
|
|
memset(®s, 0, sizeof(regs));
|
|
|
|
|
2010-07-10 16:10:18 +07:00
|
|
|
regs.ARM_r4 = (unsigned long)arg;
|
|
|
|
regs.ARM_r5 = (unsigned long)fn;
|
|
|
|
regs.ARM_r6 = (unsigned long)kernel_thread_exit;
|
|
|
|
regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
|
2005-04-17 05:20:36 +07:00
|
|
|
regs.ARM_pc = (unsigned long)kernel_thread_helper;
|
2010-07-10 16:10:18 +07:00
|
|
|
regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT;
|
2005-04-17 05:20:36 +07:00
|
|
|
|
|
|
|
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(kernel_thread);
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
|
|
{
|
2009-02-11 19:07:53 +07:00
|
|
|
struct stackframe frame;
|
2005-04-17 05:20:36 +07:00
|
|
|
int count = 0;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
|
|
return 0;
|
|
|
|
|
2009-02-11 19:07:53 +07:00
|
|
|
frame.fp = thread_saved_fp(p);
|
|
|
|
frame.sp = thread_saved_sp(p);
|
|
|
|
frame.lr = 0; /* recovered from the stack */
|
|
|
|
frame.pc = thread_saved_pc(p);
|
2005-04-17 05:20:36 +07:00
|
|
|
do {
|
2009-02-11 19:07:53 +07:00
|
|
|
int ret = unwind_frame(&frame);
|
|
|
|
if (ret < 0)
|
2005-04-17 05:20:36 +07:00
|
|
|
return 0;
|
2009-02-11 19:07:53 +07:00
|
|
|
if (!in_sched_functions(frame.pc))
|
|
|
|
return frame.pc;
|
2005-04-17 05:20:36 +07:00
|
|
|
} while (count ++ < 16);
|
|
|
|
return 0;
|
|
|
|
}
|
2010-06-15 03:27:19 +07:00
|
|
|
|
|
|
|
unsigned long arch_randomize_brk(struct mm_struct *mm)
|
|
|
|
{
|
|
|
|
unsigned long range_end = mm->brk + 0x02000000;
|
|
|
|
return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
|
|
|
|
}
|
2010-08-27 10:10:50 +07:00
|
|
|
|
2011-01-11 20:04:36 +07:00
|
|
|
#ifdef CONFIG_MMU
|
2010-08-27 10:10:50 +07:00
|
|
|
/*
|
|
|
|
* The vectors page is always readable from user space for the
|
2012-01-20 18:01:13 +07:00
|
|
|
* atomic helpers and the signal restart code. Insert it into the
|
|
|
|
* gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
|
2010-08-27 10:10:50 +07:00
|
|
|
*/
|
2012-01-20 18:01:13 +07:00
|
|
|
static struct vm_area_struct gate_vma;
|
2010-08-27 10:10:50 +07:00
|
|
|
|
2012-01-20 18:01:13 +07:00
|
|
|
static int __init gate_vma_init(void)
|
2010-08-27 10:10:50 +07:00
|
|
|
{
|
2012-01-20 18:01:13 +07:00
|
|
|
gate_vma.vm_start = 0xffff0000;
|
|
|
|
gate_vma.vm_end = 0xffff0000 + PAGE_SIZE;
|
|
|
|
gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
|
|
|
|
gate_vma.vm_flags = VM_READ | VM_EXEC |
|
2012-03-30 06:53:48 +07:00
|
|
|
VM_MAYREAD | VM_MAYEXEC;
|
2012-01-20 18:01:13 +07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
arch_initcall(gate_vma_init);
|
|
|
|
|
|
|
|
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
|
|
|
|
{
|
|
|
|
return &gate_vma;
|
|
|
|
}
|
|
|
|
|
|
|
|
int in_gate_area(struct mm_struct *mm, unsigned long addr)
|
|
|
|
{
|
|
|
|
return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
|
|
|
|
}
|
|
|
|
|
|
|
|
int in_gate_area_no_mm(unsigned long addr)
|
|
|
|
{
|
|
|
|
return in_gate_area(NULL, addr);
|
2010-08-27 10:10:50 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
const char *arch_vma_name(struct vm_area_struct *vma)
|
|
|
|
{
|
2012-01-20 18:01:13 +07:00
|
|
|
return (vma == &gate_vma) ? "[vectors]" : NULL;
|
2010-08-27 10:10:50 +07:00
|
|
|
}
|
2011-01-11 20:04:36 +07:00
|
|
|
#endif
|