[deliverable/linux.git] / arch / h8300 / kernel / process.c

/*
 *  linux/arch/h8300/kernel/process.c
 *
 * Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 *  Based on:
 *
 *  linux/arch/m68knommu/kernel/process.c
 *
 *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
 *                      Kenneth Albanowski <kjahds@kjahds.com>,
 *                      The Silver Hammer Group, Ltd.
 *
 *  linux/arch/m68k/kernel/process.c
 *
 *  Copyright (C) 1995  Hamish Macdonald
 *
 *  68060 fixes by Jesper Skov
 */

/*
 * This file handles the architecture-dependent parts of process handling..
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/fs.h>

#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/pgtable.h>

void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);

asmlinkage void ret_from_fork(void);

/*
 * The idle loop on an H8/300..
 */
#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
static void default_idle(void)
{
	local_irq_disable();
	if (!need_resched()) {
		local_irq_enable();
		/* XXX: race here! What if need_resched() gets set now? */
		__asm__("sleep");
	} else
		local_irq_enable();
}
#else
static void default_idle(void)
{
	cpu_relax();
}
#endif
void (*idle)(void) = default_idle;

/*
 * The idle thread. There's no useful work to be
 * done, so just try to conserve power and have a
 * low exit latency (ie sit in a loop waiting for
 * somebody to say that they'd like to reschedule)
 */
void cpu_idle(void)
{
	while (1) {
		while (!need_resched())
			idle();
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}

void machine_restart(char * __unused)
{
	local_irq_disable();
	__asm__("jmp @@0"); 
}

void machine_halt(void)
{
	local_irq_disable();
	__asm__("sleep");
	for (;;);
}

void machine_power_off(void)
{
	local_irq_disable();
	__asm__("sleep");
	for (;;);
}

void show_regs(struct pt_regs * regs)
{
	printk("\nPC: %08lx  Status: %02x",
	       regs->pc, regs->ccr);
	printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
	       regs->orig_er0, regs->er0, regs->er1);
	printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
	       regs->er2, regs->er3, regs->er4, regs->er5);
	printk("\nER6' %08lx ",regs->er6);
	if (user_mode(regs))
		printk("USP: %08lx\n", rdusp());
	else
		printk("\n");
}

/*
 * Create a kernel thread
 */
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
	long retval;
	long clone_arg;
	mm_segment_t fs;

	fs = get_fs();
	set_fs (KERNEL_DS);
	clone_arg = flags | CLONE_VM;
	__asm__("mov.l sp,er3\n\t"
		"sub.l er2,er2\n\t"
		"mov.l %2,er1\n\t"
		"mov.l %1,er0\n\t"
		"trapa #0\n\t"
		"cmp.l sp,er3\n\t"
		"beq 1f\n\t"
		"mov.l %4,er0\n\t"
		"mov.l %3,er1\n\t"
		"jsr @er1\n\t"
		"mov.l %5,er0\n\t"
		"trapa #0\n"
		"1:\n\t"
		"mov.l er0,%0"
		:"=r"(retval)
		:"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
		:"er0","er1","er2","er3");
	set_fs (fs);
	return retval;
}

void flush_thread(void)
{
}

/*
 * "h8300_fork()".. By the time we get here, the
 * non-volatile registers have also been saved on the
 * stack. We do some ugly pointer stuff here.. (see
 * also copy_thread)
 */

asmlinkage int h8300_fork(struct pt_regs *regs)
{
	return -EINVAL;
}

asmlinkage int h8300_vfork(struct pt_regs *regs)
{
	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
}

asmlinkage int h8300_clone(struct pt_regs *regs)
{
	unsigned long clone_flags;
	unsigned long newsp;

	/* syscall2 puts clone_flags in er1 and usp in er2 */
	clone_flags = regs->er1;
	newsp = regs->er2;
	if (!newsp)
		newsp  = rdusp();
	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);

}

int copy_thread(int nr, unsigned long clone_flags,
                unsigned long usp, unsigned long topstk,
		 struct task_struct * p, struct pt_regs * regs)
{
	struct pt_regs * childregs;

	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;

	*childregs = *regs;
	childregs->retpc = (unsigned long) ret_from_fork;
	childregs->er0 = 0;

	p->thread.usp = usp;
	p->thread.ksp = (unsigned long)childregs;

	return 0;
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...)
{
	int error;
	char * filename;
	struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);

	lock_kernel();
	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename, argv, envp, regs);
	putname(filename);
out:
	unlock_kernel();
	return error;
}

unsigned long thread_saved_pc(struct task_struct *tsk)
{
	return ((struct pt_regs *)tsk->thread.esp0)->pc;
}

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

	stack_page = (unsigned long)p;
	fp = ((struct pt_regs *)p->thread.ksp)->er6;
	do {
		if (fp < stack_page+sizeof(struct thread_info) ||
		    fp >= 8184+stack_page)
			return 0;
		pc = ((unsigned long *)fp)[1];
		if (!in_sched_functions(pc))
			return pc;
		fp = *(unsigned long *) fp;
	} while (count++ < 16);
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/h8300/kernel/process.c
	3	*
	4	* Yoshinori Sato <ysato@users.sourceforge.jp>
	5	*
	6	* Based on:
	7	*
	8	* linux/arch/m68knommu/kernel/process.c
	9	*
	10	* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
	11	* Kenneth Albanowski <kjahds@kjahds.com>,
	12	* The Silver Hammer Group, Ltd.
	13	*
	14	* linux/arch/m68k/kernel/process.c
	15	*
	16	* Copyright (C) 1995 Hamish Macdonald
	17	*
	18	* 68060 fixes by Jesper Skov
	19	*/
	20
	21	/*
	22	* This file handles the architecture-dependent parts of process handling..
	23	*/
	24
1da177e4 LT	25	#include <linux/errno.h>
	26	#include <linux/module.h>
	27	#include <linux/sched.h>
	28	#include <linux/kernel.h>
	29	#include <linux/mm.h>
	30	#include <linux/smp.h>
	31	#include <linux/smp_lock.h>
	32	#include <linux/stddef.h>
	33	#include <linux/unistd.h>
	34	#include <linux/ptrace.h>
	35	#include <linux/slab.h>
	36	#include <linux/user.h>
	37	#include <linux/a.out.h>
	38	#include <linux/interrupt.h>
	39	#include <linux/reboot.h>
0cd82ef1	40	#include <linux/fs.h>
1da177e4 LT	41
	42	#include <asm/uaccess.h>
	43	#include <asm/system.h>
	44	#include <asm/traps.h>
	45	#include <asm/setup.h>
	46	#include <asm/pgtable.h>
	47
47f3fc94 AB	48	void (*pm_power_off)(void) = NULL;
	49	EXPORT_SYMBOL(pm_power_off);
	50
1da177e4 LT	51	asmlinkage void ret_from_fork(void);
	52
	53	/*
	54	* The idle loop on an H8/300..
	55	*/
	56	#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
cdb04527	57	static void default_idle(void)
1da177e4	58	{
5bfb5d69 NP	59	local_irq_disable();
	60	if (!need_resched()) {
	61	local_irq_enable();
	62	/* XXX: race here! What if need_resched() gets set now? */
	63	__asm__("sleep");
	64	} else
	65	local_irq_enable();
1da177e4 LT	66	}
1da177e4 LT	67	#else
cdb04527	68	static void default_idle(void)
1da177e4	69	{
5bfb5d69	70	cpu_relax();
1da177e4 LT	71	}
	72	#endif
	73	void (*idle)(void) = default_idle;
	74
	75	/*
	76	* The idle thread. There's no useful work to be
	77	* done, so just try to conserve power and have a
	78	* low exit latency (ie sit in a loop waiting for
	79	* somebody to say that they'd like to reschedule)
	80	*/
	81	void cpu_idle(void)
	82	{
5bfb5d69 NP	83	while (1) {
	84	while (!need_resched())
	85	idle();
	86	preempt_enable_no_resched();
	87	schedule();
	88	preempt_disable();
	89	}
1da177e4 LT	90	}
	91
	92	void machine_restart(char * __unused)
	93	{
	94	local_irq_disable();
	95	__asm__("jmp @@0");
	96	}
	97
1da177e4 LT	98	void machine_halt(void)
	99	{
	100	local_irq_disable();
	101	__asm__("sleep");
	102	for (;;);
	103	}
	104
1da177e4 LT	105	void machine_power_off(void)
	106	{
	107	local_irq_disable();
	108	__asm__("sleep");
	109	for (;;);
	110	}
	111
1da177e4 LT	112	void show_regs(struct pt_regs * regs)
	113	{
	114	printk("\nPC: %08lx Status: %02x",
	115	regs->pc, regs->ccr);
	116	printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
	117	regs->orig_er0, regs->er0, regs->er1);
	118	printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
	119	regs->er2, regs->er3, regs->er4, regs->er5);
	120	printk("\nER6' %08lx ",regs->er6);
	121	if (user_mode(regs))
	122	printk("USP: %08lx\n", rdusp());
	123	else
	124	printk("\n");
	125	}
	126
	127	/*
	128	* Create a kernel thread
	129	*/
	130	int kernel_thread(int (fn)(void ), void * arg, unsigned long flags)
	131	{
	132	long retval;
	133	long clone_arg;
	134	mm_segment_t fs;
	135
	136	fs = get_fs();
	137	set_fs (KERNEL_DS);
	138	clone_arg = flags \| CLONE_VM;
	139	__asm__("mov.l sp,er3\n\t"
	140	"sub.l er2,er2\n\t"
	141	"mov.l %2,er1\n\t"
	142	"mov.l %1,er0\n\t"
	143	"trapa #0\n\t"
	144	"cmp.l sp,er3\n\t"
	145	"beq 1f\n\t"
	146	"mov.l %4,er0\n\t"
	147	"mov.l %3,er1\n\t"
	148	"jsr @er1\n\t"
	149	"mov.l %5,er0\n\t"
	150	"trapa #0\n"
	151	"1:\n\t"
	152	"mov.l er0,%0"
	153	:"=r"(retval)
	154	:"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
	155	:"er0","er1","er2","er3");
	156	set_fs (fs);
	157	return retval;
	158	}
	159
	160	void flush_thread(void)
	161	{
	162	}
	163
	164	/*
	165	* "h8300_fork()".. By the time we get here, the
	166	* non-volatile registers have also been saved on the
	167	* stack. We do some ugly pointer stuff here.. (see
	168	* also copy_thread)
	169	*/
	170
	171	asmlinkage int h8300_fork(struct pt_regs *regs)
	172	{
	173	return -EINVAL;
	174	}
	175
176	asmlinkage int h8300_vfork(struct pt_regs *regs)
177	{
178	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, rdusp(), regs, 0, NULL, NULL);
179	}
180
181	asmlinkage int h8300_clone(struct pt_regs *regs)
182	{
183	unsigned long clone_flags;
184	unsigned long newsp;
185
186	/* syscall2 puts clone_flags in er1 and usp in er2 */
187	clone_flags = regs->er1;
188	newsp = regs->er2;
189	if (!newsp)
190	newsp = rdusp();
191	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
192
193	}
194
195	int copy_thread(int nr, unsigned long clone_flags,
196	unsigned long usp, unsigned long topstk,
197	struct task_struct * p, struct pt_regs * regs)
198	{
199	struct pt_regs * childregs;
200
68f8b1f8	201	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
1da177e4 LT	202
	203	childregs = regs;
	204	childregs->retpc = (unsigned long) ret_from_fork;
	205	childregs->er0 = 0;
	206
	207	p->thread.usp = usp;
	208	p->thread.ksp = (unsigned long)childregs;
	209
	210	return 0;
	211	}
	212
1da177e4 LT	213	/*
	214	* sys_execve() executes a new program.
	215	*/
	216	asmlinkage int sys_execve(char name, char argv, char *envp,int dummy,...)
	217	{
	218	int error;
	219	char * filename;
	220	struct pt_regs regs = (struct pt_regs ) ((unsigned char *)&dummy-4);
	221
	222	lock_kernel();
	223	filename = getname(name);
	224	error = PTR_ERR(filename);
	225	if (IS_ERR(filename))
	226	goto out;
	227	error = do_execve(filename, argv, envp, regs);
	228	putname(filename);
	229	out:
	230	unlock_kernel();
	231	return error;
	232	}
	233
	234	unsigned long thread_saved_pc(struct task_struct *tsk)
	235	{
	236	return ((struct pt_regs *)tsk->thread.esp0)->pc;
	237	}
	238
	239	unsigned long get_wchan(struct task_struct *p)
	240	{
	241	unsigned long fp, pc;
	242	unsigned long stack_page;
	243	int count = 0;
	244	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	245	return 0;
	246
	247	stack_page = (unsigned long)p;
	248	fp = ((struct pt_regs *)p->thread.ksp)->er6;
	249	do {
	250	if (fp < stack_page+sizeof(struct thread_info) \|\|
	251	fp >= 8184+stack_page)
	252	return 0;
	253	pc = ((unsigned long *)fp)[1];
	254	if (!in_sched_functions(pc))
	255	return pc;
	256	fp = (unsigned long ) fp;
	257	} while (count++ < 16);
	258	return 0;
	259	}