[mirror_ubuntu-zesty-kernel.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/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.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 <asm/leds.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/thread_notify.h>
#include <asm/uaccess.h>
#include <asm/mach/time.h>

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"
};

extern void setup_mm_for_reboot(char mode);

static volatile int hlt_counter;

#include <asm/arch/system.h>

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);

void arm_machine_restart(char mode)
{
	/*
	 * Clean and disable cache, and turn off interrupts
	 */
	cpu_proc_fin();

	/*
	 * Tell the mm system that we are going to reboot -
	 * we may need it to insert some 1:1 mappings so that
	 * soft boot works.
	 */
	setup_mm_for_reboot(mode);

	/*
	 * Now call the architecture specific reboot code.
	 */
	arch_reset(mode);

	/*
	 * Whoops - the architecture was unable to reboot.
	 * Tell the user!
	 */
	mdelay(1000);
	printk("Reboot failed -- System halted\n");
	while (1);
}

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

void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

void (*arm_pm_restart)(char str) = arm_machine_restart;
EXPORT_SYMBOL_GPL(arm_pm_restart);


/*
 * This is our default idle handler.  We need to disable
 * interrupts here to ensure we don't miss a wakeup call.
 */
static void default_idle(void)
{
	if (hlt_counter)
		cpu_relax();
	else {
		local_irq_disable();
		if (!need_resched()) {
			timer_dyn_reprogram();
			arch_idle();
		}
		local_irq_enable();
	}
}

/*
 * The idle thread.  We try to conserve power, while trying to keep
 * overall latency low.  The architecture specific idle is passed
 * a value to indicate the level of "idleness" of the system.
 */
void cpu_idle(void)
{
	local_fiq_enable();

	/* endless idle loop with no priority at all */
	while (1) {
		void (*idle)(void) = pm_idle;

#ifdef CONFIG_HOTPLUG_CPU
		if (cpu_is_offline(smp_processor_id())) {
			leds_event(led_idle_start);
			cpu_die();
		}
#endif

		if (!idle)
			idle = default_idle;
		leds_event(led_idle_start);
		tick_nohz_stop_sched_tick();
		while (!need_resched())
			idle();
		leds_event(led_idle_end);
		tick_nohz_restart_sched_tick();
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}

static char reboot_mode = 'h';

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

__setup("reboot=", reboot_setup);

void machine_halt(void)
{
}


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

void machine_restart(char * __unused)
{
	arm_pm_restart(reboot_mode);
}

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

	printk("CPU: %d    %s  (%s %.*s)\n",
		smp_processor_id(), print_tainted(), init_utsname()->release,
		(int)strcspn(init_utsname()->version, " "),
		init_utsname()->version);
	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%s  Segment %s\n",
		buf, interrupts_enabled(regs) ? "n" : "ff",
		fast_interrupts_enabled(regs) ? "n" : "ff",
		processor_modes[processor_mode(regs)],
		thumb_mode(regs) ? " (T)" : "",
		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");
	printk("Pid: %d, comm: %20s\n", current->pid, current->comm);
	__show_regs(regs);
	__backtrace();
}

void show_fpregs(struct user_fp *regs)
{
	int i;

	for (i = 0; i < 8; i++) {
		unsigned long *p;
		char type;

		p = (unsigned long *)(regs->fpregs + i);

		switch (regs->ftype[i]) {
			case 1: type = 'f'; break;
			case 2: type = 'd'; break;
			case 3: type = 'e'; break;
			default: type = '?'; break;
		}
		if (regs->init_flag)
			type = '?';

		printk("  f%d(%c): %08lx %08lx %08lx%c",
			i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' ');
	}
			

	printk("FPSR: %08lx FPCR: %08lx\n",
		(unsigned long)regs->fpsr,
		(unsigned long)regs->fpcr);
}

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
}

ATOMIC_NOTIFIER_HEAD(thread_notify_head);

EXPORT_SYMBOL_GPL(thread_notify_head);

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

	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)
{
	struct thread_info *thread = task_thread_info(dead_task);

	thread_notify(THREAD_NOTIFY_RELEASE, thread);
}

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

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

	*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;

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

	return 0;
}

/*
 * 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);

/*
 * fill in the user structure for a core dump..
 */
void dump_thread(struct pt_regs * regs, struct user * dump)
{
	struct task_struct *tsk = current;

	dump->magic = CMAGIC;
	dump->start_code = tsk->mm->start_code;
	dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1);

	dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT;
	dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT;
	dump->u_ssize = 0;

	dump->u_debugreg[0] = tsk->thread.debug.bp[0].address;
	dump->u_debugreg[1] = tsk->thread.debug.bp[1].address;
	dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn.arm;
	dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn.arm;
	dump->u_debugreg[4] = tsk->thread.debug.nsaved;

	if (dump->start_stack < 0x04000000)
		dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT;

	dump->regs = *regs;
	dump->u_fpvalid = dump_fpu (regs, &dump->u_fp);
}
EXPORT_SYMBOL(dump_thread);

/*
 * Shuffle the argument into the correct register before calling the
 * thread function.  r1 is the thread argument, r2 is the pointer to
 * the thread function, and r3 points to the exit function.
 */
extern void kernel_thread_helper(void);
asm(	".section .text\n"
"	.align\n"
"	.type	kernel_thread_helper, #function\n"
"kernel_thread_helper:\n"
"	mov	r0, r1\n"
"	mov	lr, r3\n"
"	mov	pc, r2\n"
"	.size	kernel_thread_helper, . - kernel_thread_helper\n"
"	.previous");

/*
 * Create a kernel thread.
 */
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
	struct pt_regs regs;

	memset(&regs, 0, sizeof(regs));

	regs.ARM_r1 = (unsigned long)arg;
	regs.ARM_r2 = (unsigned long)fn;
	regs.ARM_r3 = (unsigned long)do_exit;
	regs.ARM_pc = (unsigned long)kernel_thread_helper;
	regs.ARM_cpsr = SVC_MODE;

	return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);

unsigned long get_wchan(struct task_struct *p)
{
	unsigned long fp, lr;
	unsigned long stack_start, stack_end;
	int count = 0;
	if (!p || p == current || p->state == TASK_RUNNING)
		return 0;

	stack_start = (unsigned long)end_of_stack(p);
	stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;

	fp = thread_saved_fp(p);
	do {
		if (fp < stack_start || fp > stack_end)
			return 0;
		lr = pc_pointer (((unsigned long *)fp)[-1]);
		if (!in_sched_functions(lr))
			return lr;
		fp = *(unsigned long *) (fp - 12);
	} while (count ++ < 16);
	return 0;
}
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
1da177e4 LT	13	#include <linux/module.h>
	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 LT	19	#include <linux/slab.h>
	20	#include <linux/user.h>
	21	#include <linux/a.out.h>
	22	#include <linux/delay.h>
	23	#include <linux/reboot.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/kallsyms.h>
	26	#include <linux/init.h>
a054a811	27	#include <linux/cpu.h>
84dff1a7	28	#include <linux/elfcore.h>
74617fb6	29	#include <linux/pm.h>
9e4559dd	30	#include <linux/tick.h>
154c772e	31	#include <linux/utsname.h>
1da177e4	32
1da177e4 LT	33	#include <asm/leds.h>
1da177e4 LT	34	#include <asm/processor.h>
78ff18a4	35	#include <asm/system.h>
d6551e88	36	#include <asm/thread_notify.h>
1da177e4	37	#include <asm/uaccess.h>
2ea83398	38	#include <asm/mach/time.h>
1da177e4	39
ae0a846e RK	40	static const char *processor_modes[] = {
	41	"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
	42	"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
	43	"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
	44	"UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
	45	};
	46
1da177e4 LT	47	extern void setup_mm_for_reboot(char mode);
	48
	49	static volatile int hlt_counter;
	50
	51	#include <asm/arch/system.h>
	52
	53	void disable_hlt(void)
	54	{
	55	hlt_counter++;
	56	}
	57
	58	EXPORT_SYMBOL(disable_hlt);
	59
	60	void enable_hlt(void)
	61	{
	62	hlt_counter--;
	63	}
	64
	65	EXPORT_SYMBOL(enable_hlt);
	66
	67	static int __init nohlt_setup(char *__unused)
	68	{
	69	hlt_counter = 1;
	70	return 1;
	71	}
	72
	73	static int __init hlt_setup(char *__unused)
	74	{
	75	hlt_counter = 0;
	76	return 1;
	77	}
	78
	79	__setup("nohlt", nohlt_setup);
	80	__setup("hlt", hlt_setup);
	81
74617fb6 RP	82	void arm_machine_restart(char mode)
	83	{
	84	/*
	85	* Clean and disable cache, and turn off interrupts
	86	*/
	87	cpu_proc_fin();
	88
	89	/*
	90	* Tell the mm system that we are going to reboot -
	91	* we may need it to insert some 1:1 mappings so that
	92	* soft boot works.
	93	*/
	94	setup_mm_for_reboot(mode);
	95
	96	/*
	97	* Now call the architecture specific reboot code.
	98	*/
	99	arch_reset(mode);
	100
	101	/*
	102	* Whoops - the architecture was unable to reboot.
	103	* Tell the user!
	104	*/
	105	mdelay(1000);
	106	printk("Reboot failed -- System halted\n");
	107	while (1);
	108	}
	109
1da177e4	110	/*
74617fb6	111	* Function pointers to optional machine specific functions
1da177e4 LT	112	*/
	113	void (*pm_idle)(void);
	114	EXPORT_SYMBOL(pm_idle);
	115
	116	void (*pm_power_off)(void);
	117	EXPORT_SYMBOL(pm_power_off);
	118
74617fb6 RP	119	void (*arm_pm_restart)(char str) = arm_machine_restart;
	120	EXPORT_SYMBOL_GPL(arm_pm_restart);
	121
	122
1da177e4 LT	123	/*
	124	* This is our default idle handler. We need to disable
	125	* interrupts here to ensure we don't miss a wakeup call.
	126	*/
84dff1a7	127	static void default_idle(void)
1da177e4	128	{
64c7c8f8 NP	129	if (hlt_counter)
	130	cpu_relax();
	131	else {
	132	local_irq_disable();
	133	if (!need_resched()) {
	134	timer_dyn_reprogram();
	135	arch_idle();
	136	}
	137	local_irq_enable();
2ea83398	138	}
1da177e4 LT	139	}
	140
	141	/*
	142	* The idle thread. We try to conserve power, while trying to keep
	143	* overall latency low. The architecture specific idle is passed
	144	* a value to indicate the level of "idleness" of the system.
	145	*/
	146	void cpu_idle(void)
	147	{
	148	local_fiq_enable();
	149
	150	/* endless idle loop with no priority at all */
	151	while (1) {
	152	void (*idle)(void) = pm_idle;
a054a811 RK	153
	154	#ifdef CONFIG_HOTPLUG_CPU
	155	if (cpu_is_offline(smp_processor_id())) {
	156	leds_event(led_idle_start);
	157	cpu_die();
	158	}
	159	#endif
	160
1da177e4 LT	161	if (!idle)
1da177e4 LT	162	idle = default_idle;
1da177e4	163	leds_event(led_idle_start);
9e4559dd	164	tick_nohz_stop_sched_tick();
1da177e4 LT	165	while (!need_resched())
	166	idle();
	167	leds_event(led_idle_end);
9e4559dd	168	tick_nohz_restart_sched_tick();
5bfb5d69	169	preempt_enable_no_resched();
1da177e4	170	schedule();
5bfb5d69	171	preempt_disable();
1da177e4 LT	172	}
	173	}
	174
	175	static char reboot_mode = 'h';
	176
	177	int __init reboot_setup(char *str)
	178	{
	179	reboot_mode = str[0];
	180	return 1;
	181	}
	182
	183	__setup("reboot=", reboot_setup);
	184
	185	void machine_halt(void)
	186	{
	187	}
	188
1da177e4 LT	189
	190	void machine_power_off(void)
	191	{
	192	if (pm_power_off)
	193	pm_power_off();
	194	}
	195
1da177e4 LT	196	void machine_restart(char * __unused)
1da177e4 LT	197	{
74617fb6	198	arm_pm_restart(reboot_mode);
1da177e4 LT	199	}
1da177e4 LT	200
652a12ef	201	void __show_regs(struct pt_regs *regs)
1da177e4	202	{
154c772e RK	203	unsigned long flags;
154c772e RK	204	char buf[64];
1da177e4	205
154c772e RK	206	printk("CPU: %d %s (%s %.*s)\n",
	207	smp_processor_id(), print_tainted(), init_utsname()->release,
	208	(int)strcspn(init_utsname()->version, " "),
	209	init_utsname()->version);
1da177e4 LT	210	print_symbol("PC is at %s\n", instruction_pointer(regs));
1da177e4 LT	211	print_symbol("LR is at %s\n", regs->ARM_lr);
154c772e	212	printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
1da177e4	213	"sp : %08lx ip : %08lx fp : %08lx\n",
154c772e RK	214	regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
154c772e RK	215	regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
1da177e4 LT	216	printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
	217	regs->ARM_r10, regs->ARM_r9,
	218	regs->ARM_r8);
	219	printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
	220	regs->ARM_r7, regs->ARM_r6,
	221	regs->ARM_r5, regs->ARM_r4);
	222	printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
	223	regs->ARM_r3, regs->ARM_r2,
	224	regs->ARM_r1, regs->ARM_r0);
154c772e RK	225
	226	flags = regs->ARM_cpsr;
	227	buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
	228	buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
	229	buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
	230	buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
	231	buf[4] = '\0';
	232
	233	printk("Flags: %s IRQs o%s FIQs o%s Mode %s%s Segment %s\n",
	234	buf, interrupts_enabled(regs) ? "n" : "ff",
1da177e4 LT	235	fast_interrupts_enabled(regs) ? "n" : "ff",
	236	processor_modes[processor_mode(regs)],
	237	thumb_mode(regs) ? " (T)" : "",
	238	get_fs() == get_ds() ? "kernel" : "user");
154c772e	239	#ifdef CONFIG_CPU_CP15
1da177e4	240	{
f12d0d7c	241	unsigned int ctrl;
154c772e RK	242
154c772e RK	243	buf[0] = '\0';
f12d0d7c	244	#ifdef CONFIG_CPU_CP15_MMU
154c772e RK	245	{
	246	unsigned int transbase, dac;
	247	asm("mrc p15, 0, %0, c2, c0\n\t"
	248	"mrc p15, 0, %1, c3, c0\n"
	249	: "=r" (transbase), "=r" (dac));
	250	snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
	251	transbase, dac);
	252	}
f12d0d7c	253	#endif
154c772e RK	254	asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
	255
	256	printk("Control: %08x%s\n", ctrl, buf);
	257	}
f12d0d7c	258	#endif
1da177e4 LT	259	}
1da177e4 LT	260
652a12ef RK	261	void show_regs(struct pt_regs * regs)
	262	{
	263	printk("\n");
	264	printk("Pid: %d, comm: %20s\n", current->pid, current->comm);
	265	__show_regs(regs);
	266	__backtrace();
	267	}
	268
1da177e4 LT	269	void show_fpregs(struct user_fp *regs)
	270	{
	271	int i;
	272
	273	for (i = 0; i < 8; i++) {
	274	unsigned long *p;
	275	char type;
	276
	277	p = (unsigned long *)(regs->fpregs + i);
	278
	279	switch (regs->ftype[i]) {
	280	case 1: type = 'f'; break;
	281	case 2: type = 'd'; break;
	282	case 3: type = 'e'; break;
	283	default: type = '?'; break;
	284	}
	285	if (regs->init_flag)
	286	type = '?';
	287
	288	printk(" f%d(%c): %08lx %08lx %08lx%c",
	289	i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' ');
	290	}
	291
	292
	293	printk("FPSR: %08lx FPCR: %08lx\n",
	294	(unsigned long)regs->fpsr,
	295	(unsigned long)regs->fpcr);
	296	}
	297
1da177e4 LT	298	/*
	299	* Free current thread data structures etc..
	300	*/
	301	void exit_thread(void)
	302	{
	303	}
	304
d6551e88	305	ATOMIC_NOTIFIER_HEAD(thread_notify_head);
1da177e4	306
d6551e88	307	EXPORT_SYMBOL_GPL(thread_notify_head);
1da177e4 LT	308
	309	void flush_thread(void)
	310	{
	311	struct thread_info *thread = current_thread_info();
	312	struct task_struct *tsk = current;
	313
	314	memset(thread->used_cp, 0, sizeof(thread->used_cp));
	315	memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
d6551e88 RK	316	memset(&thread->fpstate, 0, sizeof(union fp_state));
	317
	318	thread_notify(THREAD_NOTIFY_FLUSH, thread);
1da177e4 LT	319	}
	320
	321	void release_thread(struct task_struct *dead_task)
	322	{
d6551e88 RK	323	struct thread_info *thread = task_thread_info(dead_task);
	324
	325	thread_notify(THREAD_NOTIFY_RELEASE, thread);
1da177e4 LT	326	}
	327
	328	asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
	329
	330	int
	331	copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
	332	unsigned long stk_sz, struct task_struct p, struct pt_regs regs)
	333	{
815d5ec8 AV	334	struct thread_info *thread = task_thread_info(p);
815d5ec8 AV	335	struct pt_regs *childregs = task_pt_regs(p);
1da177e4	336
1da177e4 LT	337	childregs = regs;
	338	childregs->ARM_r0 = 0;
	339	childregs->ARM_sp = stack_start;
	340
	341	memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
	342	thread->cpu_context.sp = (unsigned long)childregs;
	343	thread->cpu_context.pc = (unsigned long)ret_from_fork;
	344
	345	if (clone_flags & CLONE_SETTLS)
	346	thread->tp_value = regs->ARM_r3;
	347
	348	return 0;
	349	}
	350
	351	/*
	352	* fill in the fpe structure for a core dump...
	353	*/
	354	int dump_fpu (struct pt_regs regs, struct user_fp fp)
	355	{
	356	struct thread_info *thread = current_thread_info();
	357	int used_math = thread->used_cp[1] \| thread->used_cp[2];
	358
	359	if (used_math)
	360	memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
	361
	362	return used_math != 0;
	363	}
	364	EXPORT_SYMBOL(dump_fpu);
	365
	366	/*
	367	* fill in the user structure for a core dump..
	368	*/
	369	void dump_thread(struct pt_regs * regs, struct user * dump)
	370	{
	371	struct task_struct *tsk = current;
	372
	373	dump->magic = CMAGIC;
	374	dump->start_code = tsk->mm->start_code;
	375	dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1);
	376
	377	dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT;
	378	dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT;
	379	dump->u_ssize = 0;
	380
	381	dump->u_debugreg[0] = tsk->thread.debug.bp[0].address;
	382	dump->u_debugreg[1] = tsk->thread.debug.bp[1].address;
	383	dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn.arm;
	384	dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn.arm;
	385	dump->u_debugreg[4] = tsk->thread.debug.nsaved;
	386
	387	if (dump->start_stack < 0x04000000)
	388	dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT;
	389
	390	dump->regs = *regs;
	391	dump->u_fpvalid = dump_fpu (regs, &dump->u_fp);
	392	}
	393	EXPORT_SYMBOL(dump_thread);
	394
	395	/*
	396	* Shuffle the argument into the correct register before calling the
	397	* thread function. r1 is the thread argument, r2 is the pointer to
	398	* the thread function, and r3 points to the exit function.
	399	*/
	400	extern void kernel_thread_helper(void);
401	asm( ".section .text\n"
402	" .align\n"
403	" .type kernel_thread_helper, #function\n"
404	"kernel_thread_helper:\n"
405	" mov r0, r1\n"
406	" mov lr, r3\n"
407	" mov pc, r2\n"
408	" .size kernel_thread_helper, . - kernel_thread_helper\n"
409	" .previous");
410
411	/*
412	* Create a kernel thread.
413	*/
414	pid_t kernel_thread(int (fn)(void ), void *arg, unsigned long flags)
415	{
416	struct pt_regs regs;
417
418	memset(&regs, 0, sizeof(regs));
419
420	regs.ARM_r1 = (unsigned long)arg;
421	regs.ARM_r2 = (unsigned long)fn;
422	regs.ARM_r3 = (unsigned long)do_exit;
423	regs.ARM_pc = (unsigned long)kernel_thread_helper;
424	regs.ARM_cpsr = SVC_MODE;
425
426	return do_fork(flags\|CLONE_VM\|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
427	}
428	EXPORT_SYMBOL(kernel_thread);
429
430	unsigned long get_wchan(struct task_struct *p)
431	{
432	unsigned long fp, lr;
4f7a1812	433	unsigned long stack_start, stack_end;
1da177e4 LT	434	int count = 0;
	435	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	436	return 0;
	437
55205823	438	stack_start = (unsigned long)end_of_stack(p);
32d39a93	439	stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
4f7a1812	440
1da177e4 LT	441	fp = thread_saved_fp(p);
1da177e4 LT	442	do {
4f7a1812	443	if (fp < stack_start \|\| fp > stack_end)
1da177e4 LT	444	return 0;
	445	lr = pc_pointer (((unsigned long *)fp)[-1]);
	446	if (!in_sched_functions(lr))
	447	return lr;
	448	fp = (unsigned long ) (fp - 12);
	449	} while (count ++ < 16);
	450	return 0;
	451	}