[linux-2.6-block.git] / arch / avr32 / kernel / process.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * 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 <linux/sched.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
#include <linux/ptrace.h>
#include <linux/reboot.h>
#include <linux/tick.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>

#include <asm/sysreg.h>
#include <asm/ocd.h>

#include <asm/arch/pm.h>

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

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

void cpu_idle(void)
{
	/* endless idle loop with no priority at all */
	while (1) {
		tick_nohz_stop_sched_tick(1);
		while (!need_resched())
			cpu_idle_sleep();
		tick_nohz_restart_sched_tick();
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}

void machine_halt(void)
{
	/*
	 * Enter Stop mode. The 32 kHz oscillator will keep running so
	 * the RTC will keep the time properly and the system will
	 * boot quickly.
	 */
	asm volatile("sleep 3\n\t"
		     "sub pc, -2");
}

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

void machine_restart(char *cmd)
{
	ocd_write(DC, (1 << OCD_DC_DBE_BIT));
	ocd_write(DC, (1 << OCD_DC_RES_BIT));
	while (1) ;
}

/*
 * PC is actually discarded when returning from a system call -- the
 * return address must be stored in LR. This function will make sure
 * LR points to do_exit before starting the thread.
 *
 * Also, when returning from fork(), r12 is 0, so we must copy the
 * argument as well.
 *
 *  r0 : The argument to the main thread function
 *  r1 : The address of do_exit
 *  r2 : The address of the main thread function
 */
asmlinkage extern void kernel_thread_helper(void);
__asm__("	.type	kernel_thread_helper, @function\n"
	"kernel_thread_helper:\n"
	"	mov	r12, r0\n"
	"	mov	lr, r2\n"
	"	mov	pc, r1\n"
	"	.size	kernel_thread_helper, . - kernel_thread_helper");

int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
	struct pt_regs regs;

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

	regs.r0 = (unsigned long)arg;
	regs.r1 = (unsigned long)fn;
	regs.r2 = (unsigned long)do_exit;
	regs.lr = (unsigned long)kernel_thread_helper;
	regs.pc = (unsigned long)kernel_thread_helper;
	regs.sr = MODE_SUPERVISOR;

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

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

void flush_thread(void)
{
	/* nothing to do */
}

void release_thread(struct task_struct *dead_task)
{
	/* do nothing */
}

static void dump_mem(const char *str, const char *log_lvl,
		     unsigned long bottom, unsigned long top)
{
	unsigned long p;
	int i;

	printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top);

	for (p = bottom & ~31; p < top; ) {
		printk("%s%04lx: ", log_lvl, p & 0xffff);

		for (i = 0; i < 8; i++, p += 4) {
			unsigned int val;

			if (p < bottom || p >= top)
				printk("         ");
			else {
				if (__get_user(val, (unsigned int __user *)p)) {
					printk("\n");
					goto out;
				}
				printk("%08x ", val);
			}
		}
		printk("\n");
	}

out:
	return;
}

static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
{
	return (p > (unsigned long)tinfo)
		&& (p < (unsigned long)tinfo + THREAD_SIZE - 3);
}

#ifdef CONFIG_FRAME_POINTER
static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp,
			       struct pt_regs *regs, const char *log_lvl)
{
	unsigned long lr, fp;
	struct thread_info *tinfo;

	if (regs)
		fp = regs->r7;
	else if (tsk == current)
		asm("mov %0, r7" : "=r"(fp));
	else
		fp = tsk->thread.cpu_context.r7;

	/*
	 * Walk the stack as long as the frame pointer (a) is within
	 * the kernel stack of the task, and (b) it doesn't move
	 * downwards.
	 */
	tinfo = task_thread_info(tsk);
	printk("%sCall trace:\n", log_lvl);
	while (valid_stack_ptr(tinfo, fp)) {
		unsigned long new_fp;

		lr = *(unsigned long *)fp;
#ifdef CONFIG_KALLSYMS
		printk("%s [<%08lx>] ", log_lvl, lr);
#else
		printk(" [<%08lx>] ", lr);
#endif
		print_symbol("%s\n", lr);

		new_fp = *(unsigned long *)(fp + 4);
		if (new_fp <= fp)
			break;
		fp = new_fp;
	}
	printk("\n");
}
#else
static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp,
			       struct pt_regs *regs, const char *log_lvl)
{
	unsigned long addr;

	printk("%sCall trace:\n", log_lvl);

	while (!kstack_end(sp)) {
		addr = *sp++;
		if (kernel_text_address(addr)) {
#ifdef CONFIG_KALLSYMS
			printk("%s [<%08lx>] ", log_lvl, addr);
#else
			printk(" [<%08lx>] ", addr);
#endif
			print_symbol("%s\n", addr);
		}
	}
	printk("\n");
}
#endif

void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
			struct pt_regs *regs, const char *log_lvl)
{
	struct thread_info *tinfo;

	if (sp == 0) {
		if (tsk)
			sp = tsk->thread.cpu_context.ksp;
		else
			sp = (unsigned long)&tinfo;
	}
	if (!tsk)
		tsk = current;

	tinfo = task_thread_info(tsk);

	if (valid_stack_ptr(tinfo, sp)) {
		dump_mem("Stack: ", log_lvl, sp,
			 THREAD_SIZE + (unsigned long)tinfo);
		show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl);
	}
}

void show_stack(struct task_struct *tsk, unsigned long *stack)
{
	show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
}

void dump_stack(void)
{
	unsigned long stack;

	show_trace_log_lvl(current, &stack, NULL, "");
}
EXPORT_SYMBOL(dump_stack);

static const char *cpu_modes[] = {
	"Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
	"Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
};

void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl)
{
	unsigned long sp = regs->sp;
	unsigned long lr = regs->lr;
	unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT;

	if (!user_mode(regs)) {
		sp = (unsigned long)regs + FRAME_SIZE_FULL;

		printk("%s", log_lvl);
		print_symbol("PC is at %s\n", instruction_pointer(regs));
		printk("%s", log_lvl);
		print_symbol("LR is at %s\n", lr);
	}

	printk("%spc : [<%08lx>]    lr : [<%08lx>]    %s\n"
	       "%ssp : %08lx  r12: %08lx  r11: %08lx\n",
	       log_lvl, instruction_pointer(regs), lr, print_tainted(),
	       log_lvl, sp, regs->r12, regs->r11);
	printk("%sr10: %08lx  r9 : %08lx  r8 : %08lx\n",
	       log_lvl, regs->r10, regs->r9, regs->r8);
	printk("%sr7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
	       log_lvl, regs->r7, regs->r6, regs->r5, regs->r4);
	printk("%sr3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
	       log_lvl, regs->r3, regs->r2, regs->r1, regs->r0);
	printk("%sFlags: %c%c%c%c%c\n", log_lvl,
	       regs->sr & SR_Q ? 'Q' : 'q',
	       regs->sr & SR_V ? 'V' : 'v',
	       regs->sr & SR_N ? 'N' : 'n',
	       regs->sr & SR_Z ? 'Z' : 'z',
	       regs->sr & SR_C ? 'C' : 'c');
	printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl,
	       regs->sr & SR_H ? 'H' : 'h',
	       regs->sr & SR_J ? 'J' : 'j',
	       regs->sr & SR_DM ? 'M' : 'm',
	       regs->sr & SR_D ? 'D' : 'd',
	       regs->sr & SR_EM ? 'E' : 'e',
	       regs->sr & SR_I3M ? '3' : '.',
	       regs->sr & SR_I2M ? '2' : '.',
	       regs->sr & SR_I1M ? '1' : '.',
	       regs->sr & SR_I0M ? '0' : '.',
	       regs->sr & SR_GM ? 'G' : 'g');
	printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);
	printk("%sProcess: %s [%d] (task: %p thread: %p)\n",
	       log_lvl, current->comm, current->pid, current,
	       task_thread_info(current));
}

void show_regs(struct pt_regs *regs)
{
	unsigned long sp = regs->sp;

	if (!user_mode(regs))
		sp = (unsigned long)regs + FRAME_SIZE_FULL;

	show_regs_log_lvl(regs, "");
	show_trace_log_lvl(current, (unsigned long *)sp, regs, "");
}
EXPORT_SYMBOL(show_regs);

/* Fill in the fpu structure for a core dump. This is easy -- we don't have any */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
{
	/* Not valid */
	return 0;
}

asmlinkage void ret_from_fork(void);

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

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

	if (user_mode(regs))
		childregs->sp = usp;
	else
		childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;

	childregs->r12 = 0; /* Set return value for child */

	p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM;
	p->thread.cpu_context.ksp = (unsigned long)childregs;
	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;

	clear_tsk_thread_flag(p, TIF_DEBUG);
	if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
		ocd_enable(p);

	return 0;
}

/* r12-r8 are dummy parameters to force the compiler to use the stack */
asmlinkage int sys_fork(struct pt_regs *regs)
{
	return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL);
}

asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
			 unsigned long parent_tidptr,
			 unsigned long child_tidptr, struct pt_regs *regs)
{
	if (!newsp)
		newsp = regs->sp;
	return do_fork(clone_flags, newsp, regs, 0,
		       (int __user *)parent_tidptr,
		       (int __user *)child_tidptr);
}

asmlinkage int sys_vfork(struct pt_regs *regs)
{
	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp, regs,
		       0, NULL, NULL);
}

asmlinkage int sys_execve(char __user *ufilename, char __user *__user *uargv,
			  char __user *__user *uenvp, struct pt_regs *regs)
{
	int error;
	char *filename;

	filename = getname(ufilename);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;

	error = do_execve(filename, uargv, uenvp, regs);
	if (error == 0)
		current->ptrace &= ~PT_DTRACE;
	putname(filename);

out:
	return error;
}


/*
 * This function is supposed to answer the question "who called
 * schedule()?"
 */
unsigned long get_wchan(struct task_struct *p)
{
	unsigned long pc;
	unsigned long stack_page;

	if (!p || p == current || p->state == TASK_RUNNING)
		return 0;

	stack_page = (unsigned long)task_stack_page(p);
	BUG_ON(!stack_page);

	/*
	 * The stored value of PC is either the address right after
	 * the call to __switch_to() or ret_from_fork.
	 */
	pc = thread_saved_pc(p);
	if (in_sched_functions(pc)) {
#ifdef CONFIG_FRAME_POINTER
		unsigned long fp = p->thread.cpu_context.r7;
		BUG_ON(fp < stack_page || fp > (THREAD_SIZE + stack_page));
		pc = *(unsigned long *)fp;
#else
		/*
		 * We depend on the frame size of schedule here, which
		 * is actually quite ugly. It might be possible to
		 * determine the frame size automatically at build
		 * time by doing this:
		 *   - compile sched.c
		 *   - disassemble the resulting sched.o
		 *   - look for 'sub sp,??' shortly after '<schedule>:'
		 */
		unsigned long sp = p->thread.cpu_context.ksp + 16;
		BUG_ON(sp < stack_page || sp > (THREAD_SIZE + stack_page));
		pc = *(unsigned long *)sp;
#endif
	}

	return pc;
}
Commit	Line	Data
5f97f7f9 HS	1	/*
	2	* Copyright (C) 2004-2006 Atmel Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#include <linux/sched.h>
	9	#include <linux/module.h>
	10	#include <linux/kallsyms.h>
	11	#include <linux/fs.h>
	12	#include <linux/ptrace.h>
	13	#include <linux/reboot.h>
d45ad062	14	#include <linux/tick.h>
623b0355	15	#include <linux/uaccess.h>
5f97f7f9 HS	16	#include <linux/unistd.h>
	17
	18	#include <asm/sysreg.h>
	19	#include <asm/ocd.h>
	20
7e59128f HS	21	#include <asm/arch/pm.h>
7e59128f HS	22
5f97f7f9 HS	23	void (*pm_power_off)(void) = NULL;
	24	EXPORT_SYMBOL(pm_power_off);
	25
	26	/*
	27	* This file handles the architecture-dependent parts of process handling..
	28	*/
	29
	30	void cpu_idle(void)
	31	{
	32	/* endless idle loop with no priority at all */
	33	while (1) {
b8f8c3cf	34	tick_nohz_stop_sched_tick(1);
5f97f7f9	35	while (!need_resched())
19b7ce8b	36	cpu_idle_sleep();
d45ad062	37	tick_nohz_restart_sched_tick();
5f97f7f9 HS	38	preempt_enable_no_resched();
	39	schedule();
	40	preempt_disable();
	41	}
	42	}
	43
	44	void machine_halt(void)
	45	{
c2eb5090 HS	46	/*
	47	* Enter Stop mode. The 32 kHz oscillator will keep running so
	48	* the RTC will keep the time properly and the system will
	49	* boot quickly.
	50	*/
	51	asm volatile("sleep 3\n\t"
	52	"sub pc, -2");
5f97f7f9 HS	53	}
	54
	55	void machine_power_off(void)
	56	{
ed3fa7c9 PM	57	if (pm_power_off)
ed3fa7c9 PM	58	pm_power_off();
5f97f7f9 HS	59	}
	60
	61	void machine_restart(char *cmd)
	62	{
8dfe8f29 HS	63	ocd_write(DC, (1 << OCD_DC_DBE_BIT));
8dfe8f29 HS	64	ocd_write(DC, (1 << OCD_DC_RES_BIT));
5f97f7f9 HS	65	while (1) ;
	66	}
	67
	68	/*
	69	* PC is actually discarded when returning from a system call -- the
	70	* return address must be stored in LR. This function will make sure
	71	* LR points to do_exit before starting the thread.
	72	*
	73	* Also, when returning from fork(), r12 is 0, so we must copy the
	74	* argument as well.
	75	*
	76	* r0 : The argument to the main thread function
	77	* r1 : The address of do_exit
	78	* r2 : The address of the main thread function
	79	*/
	80	asmlinkage extern void kernel_thread_helper(void);
	81	__asm__(" .type kernel_thread_helper, @function\n"
	82	"kernel_thread_helper:\n"
	83	" mov r12, r0\n"
	84	" mov lr, r2\n"
	85	" mov pc, r1\n"
	86	" .size kernel_thread_helper, . - kernel_thread_helper");
	87
	88	int kernel_thread(int (fn)(void ), void *arg, unsigned long flags)
	89	{
	90	struct pt_regs regs;
	91
	92	memset(&regs, 0, sizeof(regs));
	93
	94	regs.r0 = (unsigned long)arg;
	95	regs.r1 = (unsigned long)fn;
	96	regs.r2 = (unsigned long)do_exit;
	97	regs.lr = (unsigned long)kernel_thread_helper;
	98	regs.pc = (unsigned long)kernel_thread_helper;
	99	regs.sr = MODE_SUPERVISOR;
	100
	101	return do_fork(flags \| CLONE_VM \| CLONE_UNTRACED,
	102	0, &regs, 0, NULL, NULL);
	103	}
	104	EXPORT_SYMBOL(kernel_thread);
	105
	106	/*
	107	* Free current thread data structures etc
	108	*/
	109	void exit_thread(void)
	110	{
13b54a50	111	ocd_disable(current);
5f97f7f9 HS	112	}
	113
	114	void flush_thread(void)
	115	{
	116	/* nothing to do */
	117	}
	118
	119	void release_thread(struct task_struct *dead_task)
	120	{
	121	/* do nothing */
	122	}
	123
623b0355 HS	124	static void dump_mem(const char str, const char log_lvl,
	125	unsigned long bottom, unsigned long top)
	126	{
	127	unsigned long p;
	128	int i;
	129
	130	printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top);
	131
	132	for (p = bottom & ~31; p < top; ) {
	133	printk("%s%04lx: ", log_lvl, p & 0xffff);
	134
	135	for (i = 0; i < 8; i++, p += 4) {
	136	unsigned int val;
	137
	138	if (p < bottom \|\| p >= top)
	139	printk(" ");
	140	else {
	141	if (__get_user(val, (unsigned int __user *)p)) {
	142	printk("\n");
	143	goto out;
	144	}
	145	printk("%08x ", val);
	146	}
	147	}
	148	printk("\n");
	149	}
	150
	151	out:
	152	return;
	153	}
	154
	155	static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
	156	{
	157	return (p > (unsigned long)tinfo)
	158	&& (p < (unsigned long)tinfo + THREAD_SIZE - 3);
	159	}
	160
	161	#ifdef CONFIG_FRAME_POINTER
	162	static void show_trace_log_lvl(struct task_struct tsk, unsigned long sp,
	163	struct pt_regs regs, const char log_lvl)
	164	{
	165	unsigned long lr, fp;
	166	struct thread_info *tinfo;
	167
	168	if (regs)
	169	fp = regs->r7;
	170	else if (tsk == current)
	171	asm("mov %0, r7" : "=r"(fp));
	172	else
	173	fp = tsk->thread.cpu_context.r7;
	174
	175	/*
	176	* Walk the stack as long as the frame pointer (a) is within
	177	* the kernel stack of the task, and (b) it doesn't move
	178	* downwards.
	179	*/
	180	tinfo = task_thread_info(tsk);
	181	printk("%sCall trace:\n", log_lvl);
	182	while (valid_stack_ptr(tinfo, fp)) {
	183	unsigned long new_fp;
	184
	185	lr = (unsigned long )fp;
	186	#ifdef CONFIG_KALLSYMS
	187	printk("%s [<%08lx>] ", log_lvl, lr);
188	#else
189	printk(" [<%08lx>] ", lr);
190	#endif
191	print_symbol("%s\n", lr);
192
193	new_fp = (unsigned long )(fp + 4);
194	if (new_fp <= fp)
195	break;
196	fp = new_fp;
197	}
198	printk("\n");
199	}
200	#else
201	static void show_trace_log_lvl(struct task_struct tsk, unsigned long sp,
202	struct pt_regs regs, const char log_lvl)
203	{
204	unsigned long addr;
205
206	printk("%sCall trace:\n", log_lvl);
207
208	while (!kstack_end(sp)) {
209	addr = *sp++;
210	if (kernel_text_address(addr)) {
211	#ifdef CONFIG_KALLSYMS
212	printk("%s [<%08lx>] ", log_lvl, addr);
213	#else
214	printk(" [<%08lx>] ", addr);
215	#endif
216	print_symbol("%s\n", addr);
217	}
218	}
219	printk("\n");
220	}
221	#endif
222
223	void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
224	struct pt_regs regs, const char log_lvl)
225	{
226	struct thread_info *tinfo;
227
228	if (sp == 0) {
229	if (tsk)
230	sp = tsk->thread.cpu_context.ksp;
231	else
232	sp = (unsigned long)&tinfo;
233	}
234	if (!tsk)
235	tsk = current;
236
237	tinfo = task_thread_info(tsk);
238
239	if (valid_stack_ptr(tinfo, sp)) {
240	dump_mem("Stack: ", log_lvl, sp,
241	THREAD_SIZE + (unsigned long)tinfo);
242	show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl);
243	}
244	}
245
246	void show_stack(struct task_struct tsk, unsigned long stack)
247	{
248	show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
249	}
250
251	void dump_stack(void)
252	{
253	unsigned long stack;
254
255	show_trace_log_lvl(current, &stack, NULL, "");
256	}
257	EXPORT_SYMBOL(dump_stack);
258
5f97f7f9 HS	259	static const char *cpu_modes[] = {
	260	"Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
	261	"Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
	262	};
	263
623b0355	264	void show_regs_log_lvl(struct pt_regs regs, const char log_lvl)
5f97f7f9 HS	265	{
	266	unsigned long sp = regs->sp;
	267	unsigned long lr = regs->lr;
	268	unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT;
	269
623b0355	270	if (!user_mode(regs)) {
5f97f7f9 HS	271	sp = (unsigned long)regs + FRAME_SIZE_FULL;
5f97f7f9 HS	272
623b0355 HS	273	printk("%s", log_lvl);
	274	print_symbol("PC is at %s\n", instruction_pointer(regs));
	275	printk("%s", log_lvl);
	276	print_symbol("LR is at %s\n", lr);
	277	}
	278
	279	printk("%spc : [<%08lx>] lr : [<%08lx>] %s\n"
	280	"%ssp : %08lx r12: %08lx r11: %08lx\n",
	281	log_lvl, instruction_pointer(regs), lr, print_tainted(),
	282	log_lvl, sp, regs->r12, regs->r11);
	283	printk("%sr10: %08lx r9 : %08lx r8 : %08lx\n",
	284	log_lvl, regs->r10, regs->r9, regs->r8);
	285	printk("%sr7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
	286	log_lvl, regs->r7, regs->r6, regs->r5, regs->r4);
	287	printk("%sr3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
	288	log_lvl, regs->r3, regs->r2, regs->r1, regs->r0);
	289	printk("%sFlags: %c%c%c%c%c\n", log_lvl,
5f97f7f9 HS	290	regs->sr & SR_Q ? 'Q' : 'q',
	291	regs->sr & SR_V ? 'V' : 'v',
	292	regs->sr & SR_N ? 'N' : 'n',
	293	regs->sr & SR_Z ? 'Z' : 'z',
	294	regs->sr & SR_C ? 'C' : 'c');
df679771	295	printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl,
5f97f7f9	296	regs->sr & SR_H ? 'H' : 'h',
5f97f7f9	297	regs->sr & SR_J ? 'J' : 'j',
df679771 HS	298	regs->sr & SR_DM ? 'M' : 'm',
df679771 HS	299	regs->sr & SR_D ? 'D' : 'd',
5f97f7f9 HS	300	regs->sr & SR_EM ? 'E' : 'e',
	301	regs->sr & SR_I3M ? '3' : '.',
	302	regs->sr & SR_I2M ? '2' : '.',
	303	regs->sr & SR_I1M ? '1' : '.',
	304	regs->sr & SR_I0M ? '0' : '.',
	305	regs->sr & SR_GM ? 'G' : 'g');
623b0355 HS	306	printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);
	307	printk("%sProcess: %s [%d] (task: %p thread: %p)\n",
	308	log_lvl, current->comm, current->pid, current,
	309	task_thread_info(current));
	310	}
	311
	312	void show_regs(struct pt_regs *regs)
	313	{
	314	unsigned long sp = regs->sp;
	315
	316	if (!user_mode(regs))
	317	sp = (unsigned long)regs + FRAME_SIZE_FULL;
5f97f7f9	318
623b0355 HS	319	show_regs_log_lvl(regs, "");
623b0355 HS	320	show_trace_log_lvl(current, (unsigned long *)sp, regs, "");
5f97f7f9 HS	321	}
	322	EXPORT_SYMBOL(show_regs);
	323
	324	/* Fill in the fpu structure for a core dump. This is easy -- we don't have any */
	325	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpu)
	326	{
	327	/* Not valid */
	328	return 0;
	329	}
	330
	331	asmlinkage void ret_from_fork(void);
	332
	333	int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	334	unsigned long unused,
	335	struct task_struct p, struct pt_regs regs)
	336	{
	337	struct pt_regs *childregs;
	338
c9f4f06d	339	childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long)task_stack_page(p))) - 1;
5f97f7f9 HS	340	childregs = regs;
	341
	342	if (user_mode(regs))
	343	childregs->sp = usp;
	344	else
c9f4f06d	345	childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
5f97f7f9 HS	346
	347	childregs->r12 = 0; /* Set return value for child */
	348
	349	p->thread.cpu_context.sr = MODE_SUPERVISOR \| SR_GM;
	350	p->thread.cpu_context.ksp = (unsigned long)childregs;
	351	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
	352
325d6f55	353	clear_tsk_thread_flag(p, TIF_DEBUG);
13b54a50 HS	354	if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
	355	ocd_enable(p);
	356
5f97f7f9 HS	357	return 0;
	358	}
	359
	360	/* r12-r8 are dummy parameters to force the compiler to use the stack */
	361	asmlinkage int sys_fork(struct pt_regs *regs)
	362	{
	363	return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL);
	364	}
	365
	366	asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
	367	unsigned long parent_tidptr,
	368	unsigned long child_tidptr, struct pt_regs *regs)
	369	{
	370	if (!newsp)
	371	newsp = regs->sp;
	372	return do_fork(clone_flags, newsp, regs, 0,
	373	(int __user *)parent_tidptr,
	374	(int __user *)child_tidptr);
	375	}
	376
	377	asmlinkage int sys_vfork(struct pt_regs *regs)
	378	{
	379	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, regs->sp, regs,
	380	0, NULL, NULL);
	381	}
	382
	383	asmlinkage int sys_execve(char __user ufilename, char __user __user *uargv,
	384	char __user __user uenvp, struct pt_regs *regs)
	385	{
	386	int error;
	387	char *filename;
	388
	389	filename = getname(ufilename);
	390	error = PTR_ERR(filename);
	391	if (IS_ERR(filename))
	392	goto out;
	393
	394	error = do_execve(filename, uargv, uenvp, regs);
	395	if (error == 0)
	396	current->ptrace &= ~PT_DTRACE;
	397	putname(filename);
	398
	399	out:
	400	return error;
	401	}
	402
	403
	404	/*
	405	* This function is supposed to answer the question "who called
	406	* schedule()?"
	407	*/
	408	unsigned long get_wchan(struct task_struct *p)
	409	{
	410	unsigned long pc;
	411	unsigned long stack_page;
	412
	413	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	414	return 0;
	415
c9f4f06d	416	stack_page = (unsigned long)task_stack_page(p);
5f97f7f9 HS	417	BUG_ON(!stack_page);
	418
	419	/*
	420	* The stored value of PC is either the address right after
	421	* the call to __switch_to() or ret_from_fork.
	422	*/
	423	pc = thread_saved_pc(p);
	424	if (in_sched_functions(pc)) {
	425	#ifdef CONFIG_FRAME_POINTER
	426	unsigned long fp = p->thread.cpu_context.r7;
	427	BUG_ON(fp < stack_page \|\| fp > (THREAD_SIZE + stack_page));
	428	pc = (unsigned long )fp;
	429	#else
	430	/*
	431	* We depend on the frame size of schedule here, which
	432	* is actually quite ugly. It might be possible to
	433	* determine the frame size automatically at build
	434	* time by doing this:
	435	* - compile sched.c
	436	* - disassemble the resulting sched.o
	437	* - look for 'sub sp,??' shortly after '<schedule>:'
	438	*/
	439	unsigned long sp = p->thread.cpu_context.ksp + 16;
	440	BUG_ON(sp < stack_page \|\| sp > (THREAD_SIZE + stack_page));
	441	pc = (unsigned long )sp;
	442	#endif
	443	}
	444
	445	return pc;
	446	}