2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* linux/arch/arm/kernel/process.c
|
|
|
|
*
|
|
|
|
* Copyright (C) 1996-2000 Russell King - Converted to ARM.
|
|
|
|
* Original Copyright (C) 1995 Linus Torvalds
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
|
|
|
2011-07-22 16:58:34 +02:00
|
|
|
#include <linux/export.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/stddef.h>
|
|
|
|
#include <linux/unistd.h>
|
|
|
|
#include <linux/user.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/reboot.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/kallsyms.h>
|
|
|
|
#include <linux/init.h>
|
2005-11-02 23:24:33 +01:00
|
|
|
#include <linux/cpu.h>
|
2006-03-16 00:17:23 +01:00
|
|
|
#include <linux/elfcore.h>
|
2006-06-19 20:57:12 +02:00
|
|
|
#include <linux/pm.h>
|
2007-03-14 17:33:24 +01:00
|
|
|
#include <linux/tick.h>
|
2007-06-18 15:59:45 +02:00
|
|
|
#include <linux/utsname.h>
|
2008-09-06 12:35:55 +02:00
|
|
|
#include <linux/uaccess.h>
|
2010-06-14 22:27:19 +02:00
|
|
|
#include <linux/random.h>
|
2010-09-03 11:42:55 +02:00
|
|
|
#include <linux/hw_breakpoint.h>
|
2011-04-02 01:34:59 +02:00
|
|
|
#include <linux/cpuidle.h>
|
2012-03-13 19:26:56 +01:00
|
|
|
#include <linux/leds.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-07-26 13:22:12 +02:00
|
|
|
#include <asm/cacheflush.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#include <asm/processor.h>
|
2006-06-21 14:31:52 +02:00
|
|
|
#include <asm/thread_notify.h>
|
2009-02-11 13:07:53 +01:00
|
|
|
#include <asm/stacktrace.h>
|
2005-06-27 15:04:05 +02:00
|
|
|
#include <asm/mach/time.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-05-25 05:55:42 +02:00
|
|
|
#ifdef CONFIG_CC_STACKPROTECTOR
|
|
|
|
#include <linux/stackprotector.h>
|
|
|
|
unsigned long __stack_chk_guard __read_mostly;
|
|
|
|
EXPORT_SYMBOL(__stack_chk_guard);
|
|
|
|
#endif
|
|
|
|
|
2007-01-09 13:57:37 +01:00
|
|
|
static const char *processor_modes[] = {
|
|
|
|
"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
|
|
|
|
"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
|
|
|
|
"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
|
|
|
|
"UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
|
|
|
|
};
|
|
|
|
|
2007-06-26 02:38:27 +02:00
|
|
|
static const char *isa_modes[] = {
|
|
|
|
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
|
|
|
|
};
|
|
|
|
|
2011-11-01 11:15:27 +01:00
|
|
|
extern void setup_mm_for_reboot(void);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
static volatile int hlt_counter;
|
|
|
|
|
|
|
|
void disable_hlt(void)
|
|
|
|
{
|
|
|
|
hlt_counter++;
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(disable_hlt);
|
|
|
|
|
|
|
|
void enable_hlt(void)
|
|
|
|
{
|
|
|
|
hlt_counter--;
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(enable_hlt);
|
|
|
|
|
|
|
|
static int __init nohlt_setup(char *__unused)
|
|
|
|
{
|
|
|
|
hlt_counter = 1;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init hlt_setup(char *__unused)
|
|
|
|
{
|
|
|
|
hlt_counter = 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
__setup("nohlt", nohlt_setup);
|
|
|
|
__setup("hlt", hlt_setup);
|
|
|
|
|
2011-06-06 13:28:54 +02:00
|
|
|
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
|
|
|
|
typedef void (*phys_reset_t)(unsigned long);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* A temporary stack to use for CPU reset. This is static so that we
|
|
|
|
* don't clobber it with the identity mapping. When running with this
|
|
|
|
* stack, any references to the current task *will not work* so you
|
|
|
|
* should really do as little as possible before jumping to your reset
|
|
|
|
* code.
|
|
|
|
*/
|
|
|
|
static u64 soft_restart_stack[16];
|
|
|
|
|
|
|
|
static void __soft_restart(void *addr)
|
2006-06-19 20:57:12 +02:00
|
|
|
{
|
2011-06-06 13:28:54 +02:00
|
|
|
phys_reset_t phys_reset;
|
2006-06-19 20:57:12 +02:00
|
|
|
|
2011-06-06 13:28:54 +02:00
|
|
|
/* Take out a flat memory mapping. */
|
2011-11-01 11:15:27 +01:00
|
|
|
setup_mm_for_reboot();
|
2006-06-19 20:57:12 +02:00
|
|
|
|
2010-07-26 13:22:12 +02:00
|
|
|
/* Clean and invalidate caches */
|
|
|
|
flush_cache_all();
|
|
|
|
|
|
|
|
/* Turn off caching */
|
|
|
|
cpu_proc_fin();
|
|
|
|
|
|
|
|
/* Push out any further dirty data, and ensure cache is empty */
|
|
|
|
flush_cache_all();
|
|
|
|
|
2011-06-06 13:28:54 +02:00
|
|
|
/* Switch to the identity mapping. */
|
|
|
|
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
|
|
|
|
phys_reset((unsigned long)addr);
|
2006-06-19 20:57:12 +02:00
|
|
|
|
2011-06-06 13:28:54 +02:00
|
|
|
/* Should never get here. */
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
|
|
|
|
void soft_restart(unsigned long addr)
|
|
|
|
{
|
|
|
|
u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
|
|
|
|
|
|
|
|
/* Disable interrupts first */
|
|
|
|
local_irq_disable();
|
|
|
|
local_fiq_disable();
|
|
|
|
|
|
|
|
/* Disable the L2 if we're the last man standing. */
|
|
|
|
if (num_online_cpus() == 1)
|
|
|
|
outer_disable();
|
|
|
|
|
|
|
|
/* Change to the new stack and continue with the reset. */
|
|
|
|
call_with_stack(__soft_restart, (void *)addr, (void *)stack);
|
|
|
|
|
|
|
|
/* Should never get here. */
|
|
|
|
BUG();
|
2011-11-01 14:16:26 +01:00
|
|
|
}
|
|
|
|
|
2011-11-05 22:30:00 +01:00
|
|
|
static void null_restart(char mode, const char *cmd)
|
2011-11-01 14:16:26 +01:00
|
|
|
{
|
2006-06-19 20:57:12 +02:00
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
2006-06-19 20:57:12 +02:00
|
|
|
* Function pointers to optional machine specific functions
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
|
|
|
void (*pm_power_off)(void);
|
|
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
|
2011-11-05 22:30:00 +01:00
|
|
|
void (*arm_pm_restart)(char str, const char *cmd) = null_restart;
|
2006-06-19 20:57:12 +02:00
|
|
|
EXPORT_SYMBOL_GPL(arm_pm_restart);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
2011-08-01 23:25:06 +02:00
|
|
|
* This is our default idle handler.
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
2011-08-01 23:25:06 +02:00
|
|
|
|
|
|
|
void (*arm_pm_idle)(void);
|
|
|
|
|
2006-03-16 00:17:23 +01:00
|
|
|
static void default_idle(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2011-08-01 23:25:06 +02:00
|
|
|
if (arm_pm_idle)
|
|
|
|
arm_pm_idle();
|
|
|
|
else
|
2011-12-19 09:03:58 +01:00
|
|
|
cpu_do_idle();
|
2009-06-22 23:34:55 +02:00
|
|
|
local_irq_enable();
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2009-06-22 23:34:55 +02:00
|
|
|
void (*pm_idle)(void) = default_idle;
|
|
|
|
EXPORT_SYMBOL(pm_idle);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
2009-06-22 23:34:55 +02:00
|
|
|
* The idle thread, has rather strange semantics for calling pm_idle,
|
|
|
|
* but this is what x86 does and we need to do the same, so that
|
|
|
|
* things like cpuidle get called in the same way. The only difference
|
|
|
|
* is that we always respect 'hlt_counter' to prevent low power idle.
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
|
|
|
void cpu_idle(void)
|
|
|
|
{
|
|
|
|
local_fiq_enable();
|
|
|
|
|
|
|
|
/* endless idle loop with no priority at all */
|
|
|
|
while (1) {
|
2011-11-17 18:48:14 +01:00
|
|
|
tick_nohz_idle_enter();
|
|
|
|
rcu_idle_enter();
|
2012-03-13 19:26:56 +01:00
|
|
|
ledtrig_cpu(CPU_LED_IDLE_START);
|
2009-06-22 23:34:55 +02:00
|
|
|
while (!need_resched()) {
|
2005-11-02 23:24:33 +01:00
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
2009-06-22 23:34:55 +02:00
|
|
|
if (cpu_is_offline(smp_processor_id()))
|
|
|
|
cpu_die();
|
2005-11-02 23:24:33 +01:00
|
|
|
#endif
|
|
|
|
|
2011-08-01 23:25:06 +02:00
|
|
|
/*
|
|
|
|
* We need to disable interrupts here
|
|
|
|
* to ensure we don't miss a wakeup call.
|
|
|
|
*/
|
2009-06-22 23:34:55 +02:00
|
|
|
local_irq_disable();
|
2011-11-14 17:24:58 +01:00
|
|
|
#ifdef CONFIG_PL310_ERRATA_769419
|
|
|
|
wmb();
|
|
|
|
#endif
|
2009-06-22 23:34:55 +02:00
|
|
|
if (hlt_counter) {
|
|
|
|
local_irq_enable();
|
|
|
|
cpu_relax();
|
2011-08-01 23:25:06 +02:00
|
|
|
} else if (!need_resched()) {
|
2009-06-22 23:34:55 +02:00
|
|
|
stop_critical_timings();
|
2011-08-04 18:24:31 +02:00
|
|
|
if (cpuidle_idle_call())
|
2011-04-02 01:34:59 +02:00
|
|
|
pm_idle();
|
2009-06-22 23:34:55 +02:00
|
|
|
start_critical_timings();
|
|
|
|
/*
|
2011-08-01 23:25:06 +02:00
|
|
|
* pm_idle functions must always
|
|
|
|
* return with IRQs enabled.
|
2009-06-22 23:34:55 +02:00
|
|
|
*/
|
|
|
|
WARN_ON(irqs_disabled());
|
2011-08-01 23:25:06 +02:00
|
|
|
} else
|
2009-06-22 23:34:55 +02:00
|
|
|
local_irq_enable();
|
|
|
|
}
|
2012-03-13 19:26:56 +01:00
|
|
|
ledtrig_cpu(CPU_LED_IDLE_END);
|
2011-11-17 18:48:14 +01:00
|
|
|
rcu_idle_exit();
|
|
|
|
tick_nohz_idle_exit();
|
2011-03-21 12:33:18 +01:00
|
|
|
schedule_preempt_disabled();
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static char reboot_mode = 'h';
|
|
|
|
|
|
|
|
int __init reboot_setup(char *str)
|
|
|
|
{
|
|
|
|
reboot_mode = str[0];
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
__setup("reboot=", reboot_setup);
|
|
|
|
|
2010-07-26 14:31:27 +02:00
|
|
|
void machine_shutdown(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2010-07-26 14:31:27 +02:00
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
smp_send_stop();
|
|
|
|
#endif
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2010-07-26 14:31:27 +02:00
|
|
|
void machine_halt(void)
|
|
|
|
{
|
|
|
|
machine_shutdown();
|
2012-07-13 09:19:34 +02:00
|
|
|
local_irq_disable();
|
2010-07-26 14:31:27 +02:00
|
|
|
while (1);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
void machine_power_off(void)
|
|
|
|
{
|
2010-07-26 14:31:27 +02:00
|
|
|
machine_shutdown();
|
2005-04-17 00:20:36 +02:00
|
|
|
if (pm_power_off)
|
|
|
|
pm_power_off();
|
|
|
|
}
|
|
|
|
|
2009-03-19 17:20:24 +01:00
|
|
|
void machine_restart(char *cmd)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2010-07-26 14:31:27 +02:00
|
|
|
machine_shutdown();
|
2011-10-31 10:22:22 +01:00
|
|
|
|
2009-03-19 17:20:24 +01:00
|
|
|
arm_pm_restart(reboot_mode, cmd);
|
2011-10-31 10:22:22 +01:00
|
|
|
|
|
|
|
/* Give a grace period for failure to restart of 1s */
|
|
|
|
mdelay(1000);
|
|
|
|
|
|
|
|
/* Whoops - the platform was unable to reboot. Tell the user! */
|
|
|
|
printk("Reboot failed -- System halted\n");
|
2012-07-13 09:19:34 +02:00
|
|
|
local_irq_disable();
|
2011-10-31 10:22:22 +01:00
|
|
|
while (1);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2005-04-17 16:50:36 +02:00
|
|
|
void __show_regs(struct pt_regs *regs)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-06-18 15:59:45 +02:00
|
|
|
unsigned long flags;
|
|
|
|
char buf[64];
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-06-18 15:59:45 +02:00
|
|
|
printk("CPU: %d %s (%s %.*s)\n",
|
2010-01-08 16:59:34 +01:00
|
|
|
raw_smp_processor_id(), print_tainted(),
|
|
|
|
init_utsname()->release,
|
2007-06-18 15:59:45 +02:00
|
|
|
(int)strcspn(init_utsname()->version, " "),
|
|
|
|
init_utsname()->version);
|
2005-04-17 00:20:36 +02:00
|
|
|
print_symbol("PC is at %s\n", instruction_pointer(regs));
|
|
|
|
print_symbol("LR is at %s\n", regs->ARM_lr);
|
2007-06-18 15:59:45 +02:00
|
|
|
printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
|
2005-04-17 00:20:36 +02:00
|
|
|
"sp : %08lx ip : %08lx fp : %08lx\n",
|
2007-06-18 15:59:45 +02:00
|
|
|
regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
|
|
|
|
regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
|
2005-04-17 00:20:36 +02:00
|
|
|
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 15:59:45 +02:00
|
|
|
|
|
|
|
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 02:38:27 +02:00
|
|
|
printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
|
2007-06-18 15:59:45 +02:00
|
|
|
buf, interrupts_enabled(regs) ? "n" : "ff",
|
2005-04-17 00:20:36 +02:00
|
|
|
fast_interrupts_enabled(regs) ? "n" : "ff",
|
|
|
|
processor_modes[processor_mode(regs)],
|
2007-06-26 02:38:27 +02:00
|
|
|
isa_modes[isa_mode(regs)],
|
2005-04-17 00:20:36 +02:00
|
|
|
get_fs() == get_ds() ? "kernel" : "user");
|
2007-06-18 15:59:45 +02:00
|
|
|
#ifdef CONFIG_CPU_CP15
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-09-26 10:36:37 +02:00
|
|
|
unsigned int ctrl;
|
2007-06-18 15:59:45 +02:00
|
|
|
|
|
|
|
buf[0] = '\0';
|
2006-09-26 10:36:37 +02:00
|
|
|
#ifdef CONFIG_CPU_CP15_MMU
|
2007-06-18 15:59:45 +02:00
|
|
|
{
|
|
|
|
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 10:36:37 +02:00
|
|
|
#endif
|
2007-06-18 15:59:45 +02:00
|
|
|
asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
|
|
|
|
|
|
|
|
printk("Control: %08x%s\n", ctrl, buf);
|
|
|
|
}
|
2006-09-26 10:36:37 +02:00
|
|
|
#endif
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2005-04-17 16:50:36 +02:00
|
|
|
void show_regs(struct pt_regs * regs)
|
|
|
|
{
|
|
|
|
printk("\n");
|
2007-10-19 08:40:41 +02:00
|
|
|
printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
|
2005-04-17 16:50:36 +02:00
|
|
|
__show_regs(regs);
|
2011-08-31 03:04:06 +02:00
|
|
|
dump_stack();
|
2005-04-17 16:50:36 +02:00
|
|
|
}
|
|
|
|
|
2009-12-18 15:34:43 +01:00
|
|
|
ATOMIC_NOTIFIER_HEAD(thread_notify_head);
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(thread_notify_head);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* Free current thread data structures etc..
|
|
|
|
*/
|
|
|
|
void exit_thread(void)
|
|
|
|
{
|
2009-12-18 15:34:43 +01:00
|
|
|
thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void flush_thread(void)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = current_thread_info();
|
|
|
|
struct task_struct *tsk = current;
|
|
|
|
|
2010-09-03 11:42:55 +02:00
|
|
|
flush_ptrace_hw_breakpoint(tsk);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
memset(thread->used_cp, 0, sizeof(thread->used_cp));
|
|
|
|
memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
|
2006-06-21 14:31:52 +02:00
|
|
|
memset(&thread->fpstate, 0, sizeof(union fp_state));
|
|
|
|
|
|
|
|
thread_notify(THREAD_NOTIFY_FLUSH, thread);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
|
|
|
|
|
|
|
|
int
|
2009-04-03 01:56:59 +02:00
|
|
|
copy_thread(unsigned long clone_flags, unsigned long stack_start,
|
2005-04-17 00:20:36 +02:00
|
|
|
unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
|
|
|
|
{
|
2006-01-12 10:05:57 +01:00
|
|
|
struct thread_info *thread = task_thread_info(p);
|
|
|
|
struct pt_regs *childregs = task_pt_regs(p);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
|
2012-09-10 03:31:07 +02:00
|
|
|
|
|
|
|
if (likely(regs)) {
|
|
|
|
*childregs = *regs;
|
|
|
|
childregs->ARM_r0 = 0;
|
|
|
|
childregs->ARM_sp = stack_start;
|
|
|
|
} else {
|
2012-10-11 04:23:29 +02:00
|
|
|
memset(childregs, 0, sizeof(struct pt_regs));
|
2012-09-10 03:31:07 +02:00
|
|
|
thread->cpu_context.r4 = stk_sz;
|
|
|
|
thread->cpu_context.r5 = stack_start;
|
|
|
|
childregs->ARM_cpsr = SVC_MODE;
|
|
|
|
}
|
2012-10-11 04:23:29 +02:00
|
|
|
thread->cpu_context.pc = (unsigned long)ret_from_fork;
|
2005-04-17 00:20:36 +02:00
|
|
|
thread->cpu_context.sp = (unsigned long)childregs;
|
|
|
|
|
2010-09-03 11:42:55 +02:00
|
|
|
clear_ptrace_hw_breakpoint(p);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
if (clone_flags & CLONE_SETTLS)
|
|
|
|
thread->tp_value = regs->ARM_r3;
|
|
|
|
|
2011-04-06 17:16:29 +02:00
|
|
|
thread_notify(THREAD_NOTIFY_COPY, thread);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-10-13 09:54:30 +02:00
|
|
|
/*
|
|
|
|
* 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 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
|
|
{
|
2009-02-11 13:07:53 +01:00
|
|
|
struct stackframe frame;
|
2005-04-17 00:20:36 +02:00
|
|
|
int count = 0;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
|
|
return 0;
|
|
|
|
|
2009-02-11 13:07:53 +01:00
|
|
|
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 00:20:36 +02:00
|
|
|
do {
|
2009-02-11 13:07:53 +01:00
|
|
|
int ret = unwind_frame(&frame);
|
|
|
|
if (ret < 0)
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
2009-02-11 13:07:53 +01:00
|
|
|
if (!in_sched_functions(frame.pc))
|
|
|
|
return frame.pc;
|
2005-04-17 00:20:36 +02:00
|
|
|
} while (count ++ < 16);
|
|
|
|
return 0;
|
|
|
|
}
|
2010-06-14 22:27:19 +02:00
|
|
|
|
|
|
|
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 05:10:50 +02:00
|
|
|
|
2011-01-11 14:04:36 +01:00
|
|
|
#ifdef CONFIG_MMU
|
2010-08-27 05:10:50 +02:00
|
|
|
/*
|
|
|
|
* The vectors page is always readable from user space for the
|
2012-01-20 12:01:13 +01:00
|
|
|
* 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 05:10:50 +02:00
|
|
|
*/
|
2012-01-20 12:01:13 +01:00
|
|
|
static struct vm_area_struct gate_vma;
|
2010-08-27 05:10:50 +02:00
|
|
|
|
2012-01-20 12:01:13 +01:00
|
|
|
static int __init gate_vma_init(void)
|
2010-08-27 05:10:50 +02:00
|
|
|
{
|
2012-01-20 12:01:13 +01:00
|
|
|
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 01:53:48 +02:00
|
|
|
VM_MAYREAD | VM_MAYEXEC;
|
2012-01-20 12:01:13 +01:00
|
|
|
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 05:10:50 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
const char *arch_vma_name(struct vm_area_struct *vma)
|
|
|
|
{
|
2012-01-20 12:01:13 +01:00
|
|
|
return (vma == &gate_vma) ? "[vectors]" : NULL;
|
2010-08-27 05:10:50 +02:00
|
|
|
}
|
2011-01-11 14:04:36 +01:00
|
|
|
#endif
|