[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / kernel / process.c

/*
 *  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>

#include <linux/export.h>
#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>
#include <linux/cpu.h>
#include <linux/elfcore.h>
#include <linux/pm.h>
#include <linux/tick.h>
#include <linux/utsname.h>
#include <linux/uaccess.h>
#include <linux/random.h>
#include <linux/hw_breakpoint.h>
#include <linux/cpuidle.h>
#include <linux/leds.h>

#include <asm/cacheflush.h>
#include <asm/idmap.h>
#include <asm/processor.h>
#include <asm/thread_notify.h>
#include <asm/stacktrace.h>
#include <asm/mach/time.h>

#ifdef CONFIG_CC_STACKPROTECTOR
#include <linux/stackprotector.h>
unsigned long __stack_chk_guard __read_mostly;
EXPORT_SYMBOL(__stack_chk_guard);
#endif

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"
};

static const char *isa_modes[] = {
  "ARM" , "Thumb" , "Jazelle", "ThumbEE"
};

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)
{
	phys_reset_t phys_reset;

	/* Take out a flat memory mapping. */
	setup_mm_for_reboot();

	/* 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();

	/* Switch to the identity mapping. */
	phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
	phys_reset((unsigned long)addr);

	/* 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();
}

static void null_restart(char mode, const char *cmd)
{
}

/*
 * Function pointers to optional machine specific functions
 */
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

void (*arm_pm_restart)(char str, const char *cmd) = null_restart;
EXPORT_SYMBOL_GPL(arm_pm_restart);

/*
 * This is our default idle handler.
 */

void (*arm_pm_idle)(void);

static void default_idle(void)
{
	if (arm_pm_idle)
		arm_pm_idle();
	else
		cpu_do_idle();
	local_irq_enable();
}

void arch_cpu_idle_prepare(void)
{
	local_fiq_enable();
}

void arch_cpu_idle_enter(void)
{
	ledtrig_cpu(CPU_LED_IDLE_START);
#ifdef CONFIG_PL310_ERRATA_769419
	wmb();
#endif
}

void arch_cpu_idle_exit(void)
{
	ledtrig_cpu(CPU_LED_IDLE_END);
}

#ifdef CONFIG_HOTPLUG_CPU
void arch_cpu_idle_dead(void)
{
	cpu_die();
}
#endif

/*
 * Called from the core idle loop.
 */
void arch_cpu_idle(void)
{
	if (cpuidle_idle_call())
		default_idle();
}

static char reboot_mode = 'h';

int __init reboot_setup(char *str)
{
	reboot_mode = str[0];
	return 1;
}

__setup("reboot=", reboot_setup);

void machine_shutdown(void)
{
#ifdef CONFIG_SMP
	smp_send_stop();
#endif
}

void machine_halt(void)
{
	machine_shutdown();
	local_irq_disable();
	while (1);
}

void machine_power_off(void)
{
	machine_shutdown();
	if (pm_power_off)
		pm_power_off();
}

void machine_restart(char *cmd)
{
	machine_shutdown();

	arm_pm_restart(reboot_mode, cmd);

	/* 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");
	local_irq_disable();
	while (1);
}

void __show_regs(struct pt_regs *regs)
{
	unsigned long flags;
	char buf[64];

	show_regs_print_info(KERN_DEFAULT);

	print_symbol("PC is at %s\n", instruction_pointer(regs));
	print_symbol("LR is at %s\n", regs->ARM_lr);
	printk("pc : [<%08lx>]    lr : [<%08lx>]    psr: %08lx\n"
	       "sp : %08lx  ip : %08lx  fp : %08lx\n",
		regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
		regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
	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);

	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';

	printk("Flags: %s  IRQs o%s  FIQs o%s  Mode %s  ISA %s  Segment %s\n",
		buf, interrupts_enabled(regs) ? "n" : "ff",
		fast_interrupts_enabled(regs) ? "n" : "ff",
		processor_modes[processor_mode(regs)],
		isa_modes[isa_mode(regs)],
		get_fs() == get_ds() ? "kernel" : "user");
#ifdef CONFIG_CPU_CP15
	{
		unsigned int ctrl;

		buf[0] = '\0';
#ifdef CONFIG_CPU_CP15_MMU
		{
			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);
		}
#endif
		asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));

		printk("Control: %08x%s\n", ctrl, buf);
	}
#endif
}

void show_regs(struct pt_regs * regs)
{
	printk("\n");
	__show_regs(regs);
	dump_stack();
}

ATOMIC_NOTIFIER_HEAD(thread_notify_head);

EXPORT_SYMBOL_GPL(thread_notify_head);

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
	thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
}

void flush_thread(void)
{
	struct thread_info *thread = current_thread_info();
	struct task_struct *tsk = current;

	flush_ptrace_hw_breakpoint(tsk);

	memset(thread->used_cp, 0, sizeof(thread->used_cp));
	memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
	memset(&thread->fpstate, 0, sizeof(union fp_state));

	thread_notify(THREAD_NOTIFY_FLUSH, thread);
}

void release_thread(struct task_struct *dead_task)
{
}

asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");

int
copy_thread(unsigned long clone_flags, unsigned long stack_start,
	    unsigned long stk_sz, struct task_struct *p)
{
	struct thread_info *thread = task_thread_info(p);
	struct pt_regs *childregs = task_pt_regs(p);

	memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));

	if (likely(!(p->flags & PF_KTHREAD))) {
		*childregs = *current_pt_regs();
		childregs->ARM_r0 = 0;
		if (stack_start)
			childregs->ARM_sp = stack_start;
	} else {
		memset(childregs, 0, sizeof(struct pt_regs));
		thread->cpu_context.r4 = stk_sz;
		thread->cpu_context.r5 = stack_start;
		childregs->ARM_cpsr = SVC_MODE;
	}
	thread->cpu_context.pc = (unsigned long)ret_from_fork;
	thread->cpu_context.sp = (unsigned long)childregs;

	clear_ptrace_hw_breakpoint(p);

	if (clone_flags & CLONE_SETTLS)
		thread->tp_value = childregs->ARM_r3;

	thread_notify(THREAD_NOTIFY_COPY, thread);

	return 0;
}

/*
 * 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;
}

/*
 * 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)
{
	struct stackframe frame;
	int count = 0;
	if (!p || p == current || p->state == TASK_RUNNING)
		return 0;

	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);
	do {
		int ret = unwind_frame(&frame);
		if (ret < 0)
			return 0;
		if (!in_sched_functions(frame.pc))
			return frame.pc;
	} while (count ++ < 16);
	return 0;
}

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;
}

#ifdef CONFIG_MMU
/*
 * The vectors page is always readable from user space for the
 * atomic helpers and the signal restart code. Insert it into the
 * gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
 */
static struct vm_area_struct gate_vma = {
	.vm_start	= 0xffff0000,
	.vm_end		= 0xffff0000 + PAGE_SIZE,
	.vm_flags	= VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYEXEC,
	.vm_mm		= &init_mm,
};

static int __init gate_vma_init(void)
{
	gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
	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);
}

const char *arch_vma_name(struct vm_area_struct *vma)
{
	return (vma == &gate_vma) ? "[vectors]" : NULL;
}
#endif
Commit	Line	Data
1da177e4 LT	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
ecea4ab6	13	#include <linux/export.h>
1da177e4 LT	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>
1da177e4	19	#include <linux/user.h>
1da177e4 LT	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>
a054a811	25	#include <linux/cpu.h>
84dff1a7	26	#include <linux/elfcore.h>
74617fb6	27	#include <linux/pm.h>
9e4559dd	28	#include <linux/tick.h>
154c772e	29	#include <linux/utsname.h>
33fa9b13	30	#include <linux/uaccess.h>
990cb8ac	31	#include <linux/random.h>
864232fa	32	#include <linux/hw_breakpoint.h>
a0bfa137	33	#include <linux/cpuidle.h>
fa8bbb13	34	#include <linux/leds.h>
1da177e4	35
9ca03a21	36	#include <asm/cacheflush.h>
9ecb47de	37	#include <asm/idmap.h>
1da177e4	38	#include <asm/processor.h>
d6551e88	39	#include <asm/thread_notify.h>
2d7c11bf	40	#include <asm/stacktrace.h>
2ea83398	41	#include <asm/mach/time.h>
1da177e4	42
c743f380 NP	43	#ifdef CONFIG_CC_STACKPROTECTOR
	44	#include <linux/stackprotector.h>
	45	unsigned long __stack_chk_guard __read_mostly;
	46	EXPORT_SYMBOL(__stack_chk_guard);
	47	#endif
	48
ae0a846e RK	49	static const char *processor_modes[] = {
	50	"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
	51	"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
	52	"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
	53	"UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
	54	};
	55
909d6c6c GD	56	static const char *isa_modes[] = {
	57	"ARM" , "Thumb" , "Jazelle", "ThumbEE"
	58	};
	59
290130a1 WD	60	extern void call_with_stack(void (fn)(void ), void arg, void sp);
	61	typedef void (*phys_reset_t)(unsigned long);
	62
	63	/*
	64	* A temporary stack to use for CPU reset. This is static so that we
	65	* don't clobber it with the identity mapping. When running with this
	66	* stack, any references to the current task will not work so you
	67	* should really do as little as possible before jumping to your reset
	68	* code.
	69	*/
	70	static u64 soft_restart_stack[16];
	71
	72	static void __soft_restart(void *addr)
74617fb6	73	{
290130a1	74	phys_reset_t phys_reset;
74617fb6	75
290130a1	76	/* Take out a flat memory mapping. */
5aafec15	77	setup_mm_for_reboot();
74617fb6	78
9ca03a21 RK	79	/* Clean and invalidate caches */
	80	flush_cache_all();
	81
	82	/* Turn off caching */
	83	cpu_proc_fin();
	84
	85	/* Push out any further dirty data, and ensure cache is empty */
	86	flush_cache_all();
	87
290130a1 WD	88	/* Switch to the identity mapping. */
	89	phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
	90	phys_reset((unsigned long)addr);
74617fb6	91
290130a1 WD	92	/* Should never get here. */
	93	BUG();
	94	}
	95
	96	void soft_restart(unsigned long addr)
	97	{
	98	u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
	99
	100	/* Disable interrupts first */
	101	local_irq_disable();
	102	local_fiq_disable();
	103
	104	/* Disable the L2 if we're the last man standing. */
	105	if (num_online_cpus() == 1)
	106	outer_disable();
	107
	108	/* Change to the new stack and continue with the reset. */
	109	call_with_stack(__soft_restart, (void )addr, (void )stack);
	110
	111	/* Should never get here. */
	112	BUG();
e879c862 RK	113	}
e879c862 RK	114
f88b8979	115	static void null_restart(char mode, const char *cmd)
e879c862	116	{
74617fb6 RP	117	}
74617fb6 RP	118
1da177e4	119	/*
74617fb6	120	* Function pointers to optional machine specific functions
1da177e4	121	*/
1da177e4 LT	122	void (*pm_power_off)(void);
	123	EXPORT_SYMBOL(pm_power_off);
	124
f88b8979	125	void (arm_pm_restart)(char str, const char cmd) = null_restart;
74617fb6 RP	126	EXPORT_SYMBOL_GPL(arm_pm_restart);
74617fb6 RP	127
1da177e4	128	/*
4fa20439	129	* This is our default idle handler.
1da177e4	130	*/
4fa20439 NP	131
	132	void (*arm_pm_idle)(void);
	133
84dff1a7	134	static void default_idle(void)
1da177e4	135	{
4fa20439 NP	136	if (arm_pm_idle)
	137	arm_pm_idle();
	138	else
ae940913	139	cpu_do_idle();
9ccdac36	140	local_irq_enable();
1da177e4 LT	141	}
1da177e4 LT	142
f7b861b7	143	void arch_cpu_idle_prepare(void)
1da177e4 LT	144	{
1da177e4 LT	145	local_fiq_enable();
f7b861b7	146	}
1da177e4	147
f7b861b7 TG	148	void arch_cpu_idle_enter(void)
	149	{
	150	ledtrig_cpu(CPU_LED_IDLE_START);
	151	#ifdef CONFIG_PL310_ERRATA_769419
	152	wmb();
a054a811	153	#endif
f7b861b7	154	}
a054a811	155
f7b861b7 TG	156	void arch_cpu_idle_exit(void)
	157	{
	158	ledtrig_cpu(CPU_LED_IDLE_END);
	159	}
	160
	161	#ifdef CONFIG_HOTPLUG_CPU
	162	void arch_cpu_idle_dead(void)
	163	{
	164	cpu_die();
	165	}
11ed0ba1	166	#endif
f7b861b7 TG	167
	168	/*
	169	* Called from the core idle loop.
	170	*/
	171	void arch_cpu_idle(void)
	172	{
	173	if (cpuidle_idle_call())
	174	default_idle();
1da177e4 LT	175	}
	176
	177	static char reboot_mode = 'h';
	178
	179	int __init reboot_setup(char *str)
	180	{
	181	reboot_mode = str[0];
	182	return 1;
	183	}
	184
	185	__setup("reboot=", reboot_setup);
	186
3d3f78d7	187	void machine_shutdown(void)
1da177e4	188	{
3d3f78d7 RK	189	#ifdef CONFIG_SMP
	190	smp_send_stop();
	191	#endif
1da177e4 LT	192	}
1da177e4 LT	193
3d3f78d7 RK	194	void machine_halt(void)
	195	{
	196	machine_shutdown();
98bd8b96	197	local_irq_disable();
3d3f78d7 RK	198	while (1);
3d3f78d7 RK	199	}
1da177e4 LT	200
	201	void machine_power_off(void)
	202	{
3d3f78d7	203	machine_shutdown();
1da177e4 LT	204	if (pm_power_off)
	205	pm_power_off();
	206	}
	207
be093beb	208	void machine_restart(char *cmd)
1da177e4	209	{
3d3f78d7	210	machine_shutdown();
ac15e00b	211
be093beb	212	arm_pm_restart(reboot_mode, cmd);
ac15e00b RK	213
	214	/* Give a grace period for failure to restart of 1s */
	215	mdelay(1000);
	216
	217	/* Whoops - the platform was unable to reboot. Tell the user! */
	218	printk("Reboot failed -- System halted\n");
98bd8b96	219	local_irq_disable();
ac15e00b	220	while (1);
1da177e4 LT	221	}
1da177e4 LT	222
652a12ef	223	void __show_regs(struct pt_regs *regs)
1da177e4	224	{
154c772e RK	225	unsigned long flags;
154c772e RK	226	char buf[64];
1da177e4	227
a43cb95d TH	228	show_regs_print_info(KERN_DEFAULT);
a43cb95d TH	229
1da177e4 LT	230	print_symbol("PC is at %s\n", instruction_pointer(regs));
1da177e4 LT	231	print_symbol("LR is at %s\n", regs->ARM_lr);
154c772e	232	printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
1da177e4	233	"sp : %08lx ip : %08lx fp : %08lx\n",
154c772e RK	234	regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
154c772e RK	235	regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
1da177e4 LT	236	printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
	237	regs->ARM_r10, regs->ARM_r9,
	238	regs->ARM_r8);
	239	printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
	240	regs->ARM_r7, regs->ARM_r6,
	241	regs->ARM_r5, regs->ARM_r4);
	242	printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
	243	regs->ARM_r3, regs->ARM_r2,
	244	regs->ARM_r1, regs->ARM_r0);
154c772e RK	245
	246	flags = regs->ARM_cpsr;
	247	buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
	248	buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
	249	buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
	250	buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
	251	buf[4] = '\0';
	252
909d6c6c	253	printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
154c772e	254	buf, interrupts_enabled(regs) ? "n" : "ff",
1da177e4 LT	255	fast_interrupts_enabled(regs) ? "n" : "ff",
1da177e4 LT	256	processor_modes[processor_mode(regs)],
909d6c6c	257	isa_modes[isa_mode(regs)],
1da177e4	258	get_fs() == get_ds() ? "kernel" : "user");
154c772e	259	#ifdef CONFIG_CPU_CP15
1da177e4	260	{
f12d0d7c	261	unsigned int ctrl;
154c772e RK	262
154c772e RK	263	buf[0] = '\0';
f12d0d7c	264	#ifdef CONFIG_CPU_CP15_MMU
154c772e RK	265	{
	266	unsigned int transbase, dac;
	267	asm("mrc p15, 0, %0, c2, c0\n\t"
	268	"mrc p15, 0, %1, c3, c0\n"
	269	: "=r" (transbase), "=r" (dac));
	270	snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
	271	transbase, dac);
	272	}
f12d0d7c	273	#endif
154c772e RK	274	asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
	275
	276	printk("Control: %08x%s\n", ctrl, buf);
	277	}
f12d0d7c	278	#endif
1da177e4 LT	279	}
1da177e4 LT	280
652a12ef RK	281	void show_regs(struct pt_regs * regs)
	282	{
	283	printk("\n");
652a12ef	284	__show_regs(regs);
b380ab4f	285	dump_stack();
652a12ef RK	286	}
652a12ef RK	287
797245f5 RK	288	ATOMIC_NOTIFIER_HEAD(thread_notify_head);
	289
	290	EXPORT_SYMBOL_GPL(thread_notify_head);
	291
1da177e4 LT	292	/*
	293	* Free current thread data structures etc..
	294	*/
	295	void exit_thread(void)
	296	{
797245f5	297	thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());
1da177e4 LT	298	}
1da177e4 LT	299
1da177e4 LT	300	void flush_thread(void)
	301	{
	302	struct thread_info *thread = current_thread_info();
	303	struct task_struct *tsk = current;
	304
864232fa WD	305	flush_ptrace_hw_breakpoint(tsk);
864232fa WD	306
1da177e4 LT	307	memset(thread->used_cp, 0, sizeof(thread->used_cp));
1da177e4 LT	308	memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
d6551e88 RK	309	memset(&thread->fpstate, 0, sizeof(union fp_state));
	310
	311	thread_notify(THREAD_NOTIFY_FLUSH, thread);
1da177e4 LT	312	}
	313
	314	void release_thread(struct task_struct *dead_task)
	315	{
1da177e4 LT	316	}
	317
	318	asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
	319
	320	int
6f2c55b8	321	copy_thread(unsigned long clone_flags, unsigned long stack_start,
afa86fc4	322	unsigned long stk_sz, struct task_struct *p)
1da177e4	323	{
815d5ec8 AV	324	struct thread_info *thread = task_thread_info(p);
815d5ec8 AV	325	struct pt_regs *childregs = task_pt_regs(p);
1da177e4	326
1da177e4	327	memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
9e14f828	328
38a61b6b AV	329	if (likely(!(p->flags & PF_KTHREAD))) {
38a61b6b AV	330	childregs = current_pt_regs();
9e14f828	331	childregs->ARM_r0 = 0;
38a61b6b AV	332	if (stack_start)
38a61b6b AV	333	childregs->ARM_sp = stack_start;
9e14f828	334	} else {
9fff2fa0	335	memset(childregs, 0, sizeof(struct pt_regs));
9e14f828 AV	336	thread->cpu_context.r4 = stk_sz;
9e14f828 AV	337	thread->cpu_context.r5 = stack_start;
9e14f828 AV	338	childregs->ARM_cpsr = SVC_MODE;
9e14f828 AV	339	}
9fff2fa0	340	thread->cpu_context.pc = (unsigned long)ret_from_fork;
1da177e4	341	thread->cpu_context.sp = (unsigned long)childregs;
1da177e4	342
864232fa WD	343	clear_ptrace_hw_breakpoint(p);
864232fa WD	344
1da177e4	345	if (clone_flags & CLONE_SETTLS)
38a61b6b	346	thread->tp_value = childregs->ARM_r3;
1da177e4	347
2e82669a CM	348	thread_notify(THREAD_NOTIFY_COPY, thread);
2e82669a CM	349
1da177e4 LT	350	return 0;
	351	}
	352
cde3f860 AB	353	/*
	354	* Fill in the task's elfregs structure for a core dump.
	355	*/
	356	int dump_task_regs(struct task_struct t, elf_gregset_t elfregs)
	357	{
	358	elf_core_copy_regs(elfregs, task_pt_regs(t));
	359	return 1;
	360	}
	361
1da177e4 LT	362	/*
	363	* fill in the fpe structure for a core dump...
	364	*/
	365	int dump_fpu (struct pt_regs regs, struct user_fp fp)
	366	{
	367	struct thread_info *thread = current_thread_info();
	368	int used_math = thread->used_cp[1] \| thread->used_cp[2];
	369
	370	if (used_math)
	371	memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
	372
	373	return used_math != 0;
	374	}
	375	EXPORT_SYMBOL(dump_fpu);
	376
1da177e4 LT	377	unsigned long get_wchan(struct task_struct *p)
1da177e4 LT	378	{
2d7c11bf	379	struct stackframe frame;
1da177e4 LT	380	int count = 0;
	381	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	382	return 0;
	383
2d7c11bf CM	384	frame.fp = thread_saved_fp(p);
	385	frame.sp = thread_saved_sp(p);
	386	frame.lr = 0; /* recovered from the stack */
	387	frame.pc = thread_saved_pc(p);
1da177e4	388	do {
2d7c11bf CM	389	int ret = unwind_frame(&frame);
2d7c11bf CM	390	if (ret < 0)
1da177e4	391	return 0;
2d7c11bf CM	392	if (!in_sched_functions(frame.pc))
2d7c11bf CM	393	return frame.pc;
1da177e4 LT	394	} while (count ++ < 16);
	395	return 0;
	396	}
990cb8ac NP	397
	398	unsigned long arch_randomize_brk(struct mm_struct *mm)
	399	{
	400	unsigned long range_end = mm->brk + 0x02000000;
	401	return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
	402	}
ec706dab	403
6cde6d42	404	#ifdef CONFIG_MMU
ec706dab NP	405	/*
ec706dab NP	406	* The vectors page is always readable from user space for the
f9d4861f WD	407	* atomic helpers and the signal restart code. Insert it into the
f9d4861f WD	408	* gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
ec706dab	409	*/
f6604efe RK	410	static struct vm_area_struct gate_vma = {
	411	.vm_start = 0xffff0000,
	412	.vm_end = 0xffff0000 + PAGE_SIZE,
	413	.vm_flags = VM_READ \| VM_EXEC \| VM_MAYREAD \| VM_MAYEXEC,
	414	.vm_mm = &init_mm,
	415	};
ec706dab	416
f9d4861f	417	static int __init gate_vma_init(void)
ec706dab	418	{
f6604efe	419	gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
f9d4861f WD	420	return 0;
	421	}
	422	arch_initcall(gate_vma_init);
	423
	424	struct vm_area_struct get_gate_vma(struct mm_struct mm)
	425	{
	426	return &gate_vma;
	427	}
	428
	429	int in_gate_area(struct mm_struct *mm, unsigned long addr)
	430	{
	431	return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
	432	}
	433
	434	int in_gate_area_no_mm(unsigned long addr)
	435	{
	436	return in_gate_area(NULL, addr);
ec706dab NP	437	}
	438
	439	const char arch_vma_name(struct vm_area_struct vma)
	440	{
f9d4861f	441	return (vma == &gate_vma) ? "[vectors]" : NULL;
ec706dab	442	}
6cde6d42	443	#endif