[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/uaccess.h>
#include <linux/unistd.h>

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

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

extern void cpu_idle_sleep(void);

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

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

void machine_restart(char *cmd)
{
	__mtdr(DBGREG_DC, DC_DBE);
	__mtdr(DBGREG_DC, DC_RES);
	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)
{
	/* nothing to do */
}

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\n", log_lvl,
	       regs->sr & SR_H ? 'H' : 'h',
	       regs->sr & SR_R ? 'R' : 'r',
	       regs->sr & SR_J ? 'J' : 'j',
	       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)p->thread_info)) - 1;
	*childregs = *regs;

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

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