[deliverable/linux.git] / arch / sparc / kernel / process_32.c

/*  linux/arch/sparc/kernel/process.c
 *
 *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
 *  Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
 */

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

#include <stdarg.h>

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/smp.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/slab.h>

#include <asm/auxio.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/delay.h>
#include <asm/processor.h>
#include <asm/psr.h>
#include <asm/elf.h>
#include <asm/prom.h>
#include <asm/unistd.h>
#include <asm/setup.h>

/* 
 * Power management idle function 
 * Set in pm platform drivers (apc.c and pmc.c)
 */
void (*pm_idle)(void);
EXPORT_SYMBOL(pm_idle);

/* 
 * Power-off handler instantiation for pm.h compliance
 * This is done via auxio, but could be used as a fallback
 * handler when auxio is not present-- unused for now...
 */
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);

/*
 * sysctl - toggle power-off restriction for serial console 
 * systems in machine_power_off()
 */
int scons_pwroff = 1;

extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);

struct task_struct *last_task_used_math = NULL;
struct thread_info *current_set[NR_CPUS];

/*
 * the idle loop on a Sparc... ;)
 */
void cpu_idle(void)
{
	set_thread_flag(TIF_POLLING_NRFLAG);

	/* endless idle loop with no priority at all */
	for (;;) {
		while (!need_resched()) {
			if (pm_idle)
				(*pm_idle)();
			else
				cpu_relax();
		}
		schedule_preempt_disabled();
	}
}

/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
void machine_halt(void)
{
	local_irq_enable();
	mdelay(8);
	local_irq_disable();
	prom_halt();
	panic("Halt failed!");
}

void machine_restart(char * cmd)
{
	char *p;
	
	local_irq_enable();
	mdelay(8);
	local_irq_disable();

	p = strchr (reboot_command, '\n');
	if (p) *p = 0;
	if (cmd)
		prom_reboot(cmd);
	if (*reboot_command)
		prom_reboot(reboot_command);
	prom_feval ("reset");
	panic("Reboot failed!");
}

void machine_power_off(void)
{
	if (auxio_power_register &&
	    (strcmp(of_console_device->type, "serial") || scons_pwroff))
		*auxio_power_register |= AUXIO_POWER_OFF;
	machine_halt();
}

void show_regs(struct pt_regs *r)
{
	struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];

        printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx    %s\n",
	       r->psr, r->pc, r->npc, r->y, print_tainted());
	printk("PC: <%pS>\n", (void *) r->pc);
	printk("%%G: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
	       r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
	       r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
	printk("%%O: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
	       r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
	       r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
	printk("RPC: <%pS>\n", (void *) r->u_regs[15]);

	printk("%%L: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
	       rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
	       rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
	printk("%%I: %08lx %08lx  %08lx %08lx  %08lx %08lx  %08lx %08lx\n",
	       rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
	       rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
}

/*
 * The show_stack is an external API which we do not use ourselves.
 * The oops is printed in die_if_kernel.
 */
void show_stack(struct task_struct *tsk, unsigned long *_ksp)
{
	unsigned long pc, fp;
	unsigned long task_base;
	struct reg_window32 *rw;
	int count = 0;

	if (tsk != NULL)
		task_base = (unsigned long) task_stack_page(tsk);
	else
		task_base = (unsigned long) current_thread_info();

	fp = (unsigned long) _ksp;
	do {
		/* Bogus frame pointer? */
		if (fp < (task_base + sizeof(struct thread_info)) ||
		    fp >= (task_base + (PAGE_SIZE << 1)))
			break;
		rw = (struct reg_window32 *) fp;
		pc = rw->ins[7];
		printk("[%08lx : ", pc);
		printk("%pS ] ", (void *) pc);
		fp = rw->ins[6];
	} while (++count < 16);
	printk("\n");
}

void dump_stack(void)
{
	unsigned long *ksp;

	__asm__ __volatile__("mov	%%fp, %0"
			     : "=r" (ksp));
	show_stack(current, ksp);
}

EXPORT_SYMBOL(dump_stack);

/*
 * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
 */
unsigned long thread_saved_pc(struct task_struct *tsk)
{
	return task_thread_info(tsk)->kpc;
}

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
#ifndef CONFIG_SMP
	if(last_task_used_math == current) {
#else
	if (test_thread_flag(TIF_USEDFPU)) {
#endif
		/* Keep process from leaving FPU in a bogon state. */
		put_psr(get_psr() | PSR_EF);
		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
#ifndef CONFIG_SMP
		last_task_used_math = NULL;
#else
		clear_thread_flag(TIF_USEDFPU);
#endif
	}
}

void flush_thread(void)
{
	current_thread_info()->w_saved = 0;

#ifndef CONFIG_SMP
	if(last_task_used_math == current) {
#else
	if (test_thread_flag(TIF_USEDFPU)) {
#endif
		/* Clean the fpu. */
		put_psr(get_psr() | PSR_EF);
		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
#ifndef CONFIG_SMP
		last_task_used_math = NULL;
#else
		clear_thread_flag(TIF_USEDFPU);
#endif
	}

	/* This task is no longer a kernel thread. */
	if (current->thread.flags & SPARC_FLAG_KTHREAD) {
		current->thread.flags &= ~SPARC_FLAG_KTHREAD;

		/* We must fixup kregs as well. */
		/* XXX This was not fixed for ti for a while, worked. Unused? */
		current->thread.kregs = (struct pt_regs *)
		    (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
	}
}

static inline struct sparc_stackf __user *
clone_stackframe(struct sparc_stackf __user *dst,
		 struct sparc_stackf __user *src)
{
	unsigned long size, fp;
	struct sparc_stackf *tmp;
	struct sparc_stackf __user *sp;

	if (get_user(tmp, &src->fp))
		return NULL;

	fp = (unsigned long) tmp;
	size = (fp - ((unsigned long) src));
	fp = (unsigned long) dst;
	sp = (struct sparc_stackf __user *)(fp - size); 

	/* do_fork() grabs the parent semaphore, we must release it
	 * temporarily so we can build the child clone stack frame
	 * without deadlocking.
	 */
	if (__copy_user(sp, src, size))
		sp = NULL;
	else if (put_user(fp, &sp->fp))
		sp = NULL;

	return sp;
}

asmlinkage int sparc_do_fork(unsigned long clone_flags,
                             unsigned long stack_start,
                             struct pt_regs *regs,
                             unsigned long stack_size)
{
	unsigned long parent_tid_ptr, child_tid_ptr;
	unsigned long orig_i1 = regs->u_regs[UREG_I1];
	long ret;

	parent_tid_ptr = regs->u_regs[UREG_I2];
	child_tid_ptr = regs->u_regs[UREG_I4];

	ret = do_fork(clone_flags, stack_start,
		      regs, stack_size,
		      (int __user *) parent_tid_ptr,
		      (int __user *) child_tid_ptr);

	/* If we get an error and potentially restart the system
	 * call, we're screwed because copy_thread() clobbered
	 * the parent's %o1.  So detect that case and restore it
	 * here.
	 */
	if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
		regs->u_regs[UREG_I1] = orig_i1;

	return ret;
}

/* Copy a Sparc thread.  The fork() return value conventions
 * under SunOS are nothing short of bletcherous:
 * Parent -->  %o0 == childs  pid, %o1 == 0
 * Child  -->  %o0 == parents pid, %o1 == 1
 *
 * NOTE: We have a separate fork kpsr/kwim because
 *       the parent could change these values between
 *       sys_fork invocation and when we reach here
 *       if the parent should sleep while trying to
 *       allocate the task_struct and kernel stack in
 *       do_fork().
 * XXX See comment above sys_vfork in sparc64. todo.
 */
extern void ret_from_fork(void);

int copy_thread(unsigned long clone_flags, unsigned long sp,
		unsigned long unused,
		struct task_struct *p, struct pt_regs *regs)
{
	struct thread_info *ti = task_thread_info(p);
	struct pt_regs *childregs;
	char *new_stack;

#ifndef CONFIG_SMP
	if(last_task_used_math == current) {
#else
	if (test_thread_flag(TIF_USEDFPU)) {
#endif
		put_psr(get_psr() | PSR_EF);
		fpsave(&p->thread.float_regs[0], &p->thread.fsr,
		       &p->thread.fpqueue[0], &p->thread.fpqdepth);
#ifdef CONFIG_SMP
		clear_thread_flag(TIF_USEDFPU);
#endif
	}

	/*
	 *  p->thread_info         new_stack   childregs
	 *  !                      !           !             {if(PSR_PS) }
	 *  V                      V (stk.fr.) V  (pt_regs)  { (stk.fr.) }
	 *  +----- - - - - - ------+===========+============={+==========}+
	 */
	new_stack = task_stack_page(p) + THREAD_SIZE;
	if (regs->psr & PSR_PS)
		new_stack -= STACKFRAME_SZ;
	new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
	memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
	childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);

	/*
	 * A new process must start with interrupts closed in 2.5,
	 * because this is how Mingo's scheduler works (see schedule_tail
	 * and finish_arch_switch). If we do not do it, a timer interrupt hits
	 * before we unlock, attempts to re-take the rq->lock, and then we die.
	 * Thus, kpsr|=PSR_PIL.
	 */
	ti->ksp = (unsigned long) new_stack;
	ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
	ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
	ti->kwim = current->thread.fork_kwim;

	if(regs->psr & PSR_PS) {
		extern struct pt_regs fake_swapper_regs;

		p->thread.kregs = &fake_swapper_regs;
		new_stack += STACKFRAME_SZ + TRACEREG_SZ;
		childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
		p->thread.flags |= SPARC_FLAG_KTHREAD;
		p->thread.current_ds = KERNEL_DS;
		memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
		childregs->u_regs[UREG_G6] = (unsigned long) ti;
	} else {
		p->thread.kregs = childregs;
		childregs->u_regs[UREG_FP] = sp;
		p->thread.flags &= ~SPARC_FLAG_KTHREAD;
		p->thread.current_ds = USER_DS;

		if (sp != regs->u_regs[UREG_FP]) {
			struct sparc_stackf __user *childstack;
			struct sparc_stackf __user *parentstack;

			/*
			 * This is a clone() call with supplied user stack.
			 * Set some valid stack frames to give to the child.
			 */
			childstack = (struct sparc_stackf __user *)
				(sp & ~0xfUL);
			parentstack = (struct sparc_stackf __user *)
				regs->u_regs[UREG_FP];

#if 0
			printk("clone: parent stack:\n");
			show_stackframe(parentstack);
#endif

			childstack = clone_stackframe(childstack, parentstack);
			if (!childstack)
				return -EFAULT;

#if 0
			printk("clone: child stack:\n");
			show_stackframe(childstack);
#endif

			childregs->u_regs[UREG_FP] = (unsigned long)childstack;
		}
	}

#ifdef CONFIG_SMP
	/* FPU must be disabled on SMP. */
	childregs->psr &= ~PSR_EF;
#endif

	/* Set the return value for the child. */
	childregs->u_regs[UREG_I0] = current->pid;
	childregs->u_regs[UREG_I1] = 1;

	/* Set the return value for the parent. */
	regs->u_regs[UREG_I1] = 0;

	if (clone_flags & CLONE_SETTLS)
		childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];

	return 0;
}

/*
 * fill in the fpu structure for a core dump.
 */
int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
{
	if (used_math()) {
		memset(fpregs, 0, sizeof(*fpregs));
		fpregs->pr_q_entrysize = 8;
		return 1;
	}
#ifdef CONFIG_SMP
	if (test_thread_flag(TIF_USEDFPU)) {
		put_psr(get_psr() | PSR_EF);
		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
		if (regs != NULL) {
			regs->psr &= ~(PSR_EF);
			clear_thread_flag(TIF_USEDFPU);
		}
	}
#else
	if (current == last_task_used_math) {
		put_psr(get_psr() | PSR_EF);
		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
		if (regs != NULL) {
			regs->psr &= ~(PSR_EF);
			last_task_used_math = NULL;
		}
	}
#endif
	memcpy(&fpregs->pr_fr.pr_regs[0],
	       &current->thread.float_regs[0],
	       (sizeof(unsigned long) * 32));
	fpregs->pr_fsr = current->thread.fsr;
	fpregs->pr_qcnt = current->thread.fpqdepth;
	fpregs->pr_q_entrysize = 8;
	fpregs->pr_en = 1;
	if(fpregs->pr_qcnt != 0) {
		memcpy(&fpregs->pr_q[0],
		       &current->thread.fpqueue[0],
		       sizeof(struct fpq) * fpregs->pr_qcnt);
	}
	/* Zero out the rest. */
	memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
	       sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
	return 1;
}

/*
 * sparc_execve() executes a new program after the asm stub has set
 * things up for us.  This should basically do what I want it to.
 */
asmlinkage int sparc_execve(struct pt_regs *regs)
{
	int error, base = 0;
	char *filename;

	/* Check for indirect call. */
	if(regs->u_regs[UREG_G1] == 0)
		base = 1;

	filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
	error = PTR_ERR(filename);
	if(IS_ERR(filename))
		goto out;
	error = do_execve(filename,
			  (const char __user *const  __user *)
			  regs->u_regs[base + UREG_I1],
			  (const char __user *const  __user *)
			  regs->u_regs[base + UREG_I2],
			  regs);
	putname(filename);
out:
	return error;
}

/*
 * This is the mechanism for creating a new kernel thread.
 *
 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
 * who haven't done an "execve()") should use this: it will work within
 * a system call from a "real" process, but the process memory space will
 * not be freed until both the parent and the child have exited.
 */
pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
	long retval;

	__asm__ __volatile__("mov %4, %%g2\n\t"    /* Set aside fn ptr... */
			     "mov %5, %%g3\n\t"    /* and arg. */
			     "mov %1, %%g1\n\t"
			     "mov %2, %%o0\n\t"    /* Clone flags. */
			     "mov 0, %%o1\n\t"     /* usp arg == 0 */
			     "t 0x10\n\t"          /* Linux/Sparc clone(). */
			     "cmp %%o1, 0\n\t"
			     "be 1f\n\t"           /* The parent, just return. */
			     " nop\n\t"            /* Delay slot. */
			     "jmpl %%g2, %%o7\n\t" /* Call the function. */
			     " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
			     "mov %3, %%g1\n\t"
			     "t 0x10\n\t"          /* Linux/Sparc exit(). */
			     /* Notreached by child. */
			     "1: mov %%o0, %0\n\t" :
			     "=r" (retval) :
			     "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
			     "i" (__NR_exit),  "r" (fn), "r" (arg) :
			     "g1", "g2", "g3", "o0", "o1", "memory", "cc");
	return retval;
}
EXPORT_SYMBOL(kernel_thread);

unsigned long get_wchan(struct task_struct *task)
{
	unsigned long pc, fp, bias = 0;
	unsigned long task_base = (unsigned long) task;
        unsigned long ret = 0;
	struct reg_window32 *rw;
	int count = 0;

	if (!task || task == current ||
            task->state == TASK_RUNNING)
		goto out;

	fp = task_thread_info(task)->ksp + bias;
	do {
		/* Bogus frame pointer? */
		if (fp < (task_base + sizeof(struct thread_info)) ||
		    fp >= (task_base + (2 * PAGE_SIZE)))
			break;
		rw = (struct reg_window32 *) fp;
		pc = rw->ins[7];
		if (!in_sched_functions(pc)) {
			ret = pc;
			goto out;
		}
		fp = rw->ins[6] + bias;
	} while (++count < 16);

out:
	return ret;
}
Commit	Line	Data
64d329ee	1	/* linux/arch/sparc/kernel/process.c
1da177e4	2	*
4fe3ebec	3	* Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
1da177e4 LT	4	* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
	5	*/
	6
	7	/*
	8	* This file handles the architecture-dependent parts of process handling..
	9	*/
	10
	11	#include <stdarg.h>
	12
	13	#include <linux/errno.h>
	14	#include <linux/module.h>
	15	#include <linux/sched.h>
	16	#include <linux/kernel.h>
1da177e4 LT	17	#include <linux/mm.h>
	18	#include <linux/stddef.h>
	19	#include <linux/ptrace.h>
1da177e4	20	#include <linux/user.h>
1da177e4	21	#include <linux/smp.h>
1da177e4 LT	22	#include <linux/reboot.h>
	23	#include <linux/delay.h>
	24	#include <linux/pm.h>
	25	#include <linux/init.h>
5a0e3ad6	26	#include <linux/slab.h>
1da177e4 LT	27
	28	#include <asm/auxio.h>
	29	#include <asm/oplib.h>
	30	#include <asm/uaccess.h>
1da177e4 LT	31	#include <asm/page.h>
	32	#include <asm/pgalloc.h>
	33	#include <asm/pgtable.h>
	34	#include <asm/delay.h>
	35	#include <asm/processor.h>
	36	#include <asm/psr.h>
	37	#include <asm/elf.h>
c73fcc84	38	#include <asm/prom.h>
1da177e4	39	#include <asm/unistd.h>
d550bbd4	40	#include <asm/setup.h>
1da177e4 LT	41
	42	/*
	43	* Power management idle function
	44	* Set in pm platform drivers (apc.c and pmc.c)
	45	*/
	46	void (*pm_idle)(void);
6943f3da	47	EXPORT_SYMBOL(pm_idle);
1da177e4 LT	48
	49	/*
	50	* Power-off handler instantiation for pm.h compliance
	51	* This is done via auxio, but could be used as a fallback
	52	* handler when auxio is not present-- unused for now...
	53	*/
304cd3ef	54	void (*pm_power_off)(void) = machine_power_off;
89eb1693	55	EXPORT_SYMBOL(pm_power_off);
1da177e4 LT	56
	57	/*
	58	* sysctl - toggle power-off restriction for serial console
	59	* systems in machine_power_off()
	60	*/
	61	int scons_pwroff = 1;
	62
	63	extern void fpsave(unsigned long , unsigned long , void , unsigned long );
	64
	65	struct task_struct *last_task_used_math = NULL;
	66	struct thread_info *current_set[NR_CPUS];
	67
1da177e4 LT	68	/*
	69	* the idle loop on a Sparc... ;)
	70	*/
	71	void cpu_idle(void)
	72	{
3732106a	73	set_thread_flag(TIF_POLLING_NRFLAG);
1da177e4	74
1da177e4	75	/* endless idle loop with no priority at all */
3732106a SR	76	for (;;) {
	77	while (!need_resched()) {
	78	if (pm_idle)
2645e721	79	(*pm_idle)();
3732106a	80	else
2645e721 DH	81	cpu_relax();
2645e721 DH	82	}
bd2f5536	83	schedule_preempt_disabled();
1da177e4 LT	84	}
	85	}
	86
1da177e4 LT	87	/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
	88	void machine_halt(void)
	89	{
	90	local_irq_enable();
	91	mdelay(8);
	92	local_irq_disable();
1da177e4 LT	93	prom_halt();
	94	panic("Halt failed!");
	95	}
	96
1da177e4 LT	97	void machine_restart(char * cmd)
	98	{
	99	char *p;
	100
	101	local_irq_enable();
	102	mdelay(8);
	103	local_irq_disable();
	104
	105	p = strchr (reboot_command, '\n');
	106	if (p) *p = 0;
1da177e4 LT	107	if (cmd)
	108	prom_reboot(cmd);
	109	if (*reboot_command)
	110	prom_reboot(reboot_command);
	111	prom_feval ("reset");
	112	panic("Reboot failed!");
	113	}
	114
1da177e4 LT	115	void machine_power_off(void)
1da177e4 LT	116	{
c73fcc84 DM	117	if (auxio_power_register &&
c73fcc84 DM	118	(strcmp(of_console_device->type, "serial") \|\| scons_pwroff))
1da177e4	119	*auxio_power_register \|= AUXIO_POWER_OFF;
1da177e4 LT	120	machine_halt();
	121	}
	122
1da177e4 LT	123	void show_regs(struct pt_regs *r)
1da177e4 LT	124	{
4d7b92ad	125	struct reg_window32 rw = (struct reg_window32 ) r->u_regs[14];
1da177e4 LT	126
	127	printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
	128	r->psr, r->pc, r->npc, r->y, print_tainted());
4fe3ebec	129	printk("PC: <%pS>\n", (void *) r->pc);
1da177e4 LT	130	printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
	131	r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
	132	r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
	133	printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
	134	r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
	135	r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
4fe3ebec	136	printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
1da177e4 LT	137
	138	printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
	139	rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
	140	rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
	141	printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
	142	rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
	143	rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
	144	}
	145
	146	/*
	147	* The show_stack is an external API which we do not use ourselves.
	148	* The oops is printed in die_if_kernel.
	149	*/
	150	void show_stack(struct task_struct tsk, unsigned long _ksp)
	151	{
	152	unsigned long pc, fp;
	153	unsigned long task_base;
4d7b92ad	154	struct reg_window32 *rw;
1da177e4 LT	155	int count = 0;
	156
	157	if (tsk != NULL)
36483c6b	158	task_base = (unsigned long) task_stack_page(tsk);
1da177e4 LT	159	else
	160	task_base = (unsigned long) current_thread_info();
	161
	162	fp = (unsigned long) _ksp;
	163	do {
	164	/* Bogus frame pointer? */
	165	if (fp < (task_base + sizeof(struct thread_info)) \|\|
	166	fp >= (task_base + (PAGE_SIZE << 1)))
	167	break;
4d7b92ad	168	rw = (struct reg_window32 *) fp;
1da177e4 LT	169	pc = rw->ins[7];
1da177e4 LT	170	printk("[%08lx : ", pc);
4fe3ebec	171	printk("%pS ] ", (void *) pc);
1da177e4 LT	172	fp = rw->ins[6];
	173	} while (++count < 16);
	174	printk("\n");
	175	}
	176
24dc6ead TC	177	void dump_stack(void)
	178	{
	179	unsigned long *ksp;
	180
	181	__asm__ __volatile__("mov %%fp, %0"
	182	: "=r" (ksp));
	183	show_stack(current, ksp);
	184	}
	185
	186	EXPORT_SYMBOL(dump_stack);
	187
1da177e4 LT	188	/*
	189	* Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
	190	*/
	191	unsigned long thread_saved_pc(struct task_struct *tsk)
	192	{
d562ef6a	193	return task_thread_info(tsk)->kpc;
1da177e4 LT	194	}
	195
	196	/*
	197	* Free current thread data structures etc..
	198	*/
	199	void exit_thread(void)
	200	{
	201	#ifndef CONFIG_SMP
	202	if(last_task_used_math == current) {
	203	#else
54f565ea	204	if (test_thread_flag(TIF_USEDFPU)) {
1da177e4 LT	205	#endif
	206	/* Keep process from leaving FPU in a bogon state. */
	207	put_psr(get_psr() \| PSR_EF);
	208	fpsave(&current->thread.float_regs[0], &current->thread.fsr,
	209	&current->thread.fpqueue[0], &current->thread.fpqdepth);
	210	#ifndef CONFIG_SMP
	211	last_task_used_math = NULL;
	212	#else
54f565ea	213	clear_thread_flag(TIF_USEDFPU);
1da177e4 LT	214	#endif
	215	}
	216	}
	217
	218	void flush_thread(void)
	219	{
	220	current_thread_info()->w_saved = 0;
	221
1da177e4 LT	222	#ifndef CONFIG_SMP
	223	if(last_task_used_math == current) {
	224	#else
54f565ea	225	if (test_thread_flag(TIF_USEDFPU)) {
1da177e4 LT	226	#endif
	227	/* Clean the fpu. */
	228	put_psr(get_psr() \| PSR_EF);
	229	fpsave(&current->thread.float_regs[0], &current->thread.fsr,
	230	&current->thread.fpqueue[0], &current->thread.fpqdepth);
	231	#ifndef CONFIG_SMP
	232	last_task_used_math = NULL;
	233	#else
54f565ea	234	clear_thread_flag(TIF_USEDFPU);
1da177e4 LT	235	#endif
	236	}
	237
ddd53bf1	238	/* This task is no longer a kernel thread. */
1da177e4 LT	239	if (current->thread.flags & SPARC_FLAG_KTHREAD) {
	240	current->thread.flags &= ~SPARC_FLAG_KTHREAD;
	241
	242	/* We must fixup kregs as well. */
	243	/* XXX This was not fixed for ti for a while, worked. Unused? */
	244	current->thread.kregs = (struct pt_regs *)
36483c6b	245	(task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
1da177e4 LT	246	}
	247	}
	248
64d329ee	249	static inline struct sparc_stackf __user *
1da177e4 LT	250	clone_stackframe(struct sparc_stackf __user *dst,
	251	struct sparc_stackf __user *src)
	252	{
	253	unsigned long size, fp;
	254	struct sparc_stackf *tmp;
	255	struct sparc_stackf __user *sp;
	256
	257	if (get_user(tmp, &src->fp))
	258	return NULL;
	259
	260	fp = (unsigned long) tmp;
	261	size = (fp - ((unsigned long) src));
	262	fp = (unsigned long) dst;
	263	sp = (struct sparc_stackf __user *)(fp - size);
	264
	265	/* do_fork() grabs the parent semaphore, we must release it
	266	* temporarily so we can build the child clone stack frame
	267	* without deadlocking.
	268	*/
	269	if (__copy_user(sp, src, size))
	270	sp = NULL;
	271	else if (put_user(fp, &sp->fp))
	272	sp = NULL;
	273
	274	return sp;
	275	}
	276
	277	asmlinkage int sparc_do_fork(unsigned long clone_flags,
	278	unsigned long stack_start,
	279	struct pt_regs *regs,
	280	unsigned long stack_size)
	281	{
	282	unsigned long parent_tid_ptr, child_tid_ptr;
1e38c126 DM	283	unsigned long orig_i1 = regs->u_regs[UREG_I1];
1e38c126 DM	284	long ret;
1da177e4 LT	285
	286	parent_tid_ptr = regs->u_regs[UREG_I2];
	287	child_tid_ptr = regs->u_regs[UREG_I4];
	288
1e38c126 DM	289	ret = do_fork(clone_flags, stack_start,
	290	regs, stack_size,
	291	(int __user *) parent_tid_ptr,
	292	(int __user *) child_tid_ptr);
	293
	294	/* If we get an error and potentially restart the system
	295	* call, we're screwed because copy_thread() clobbered
	296	* the parent's %o1. So detect that case and restore it
	297	* here.
	298	*/
	299	if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
	300	regs->u_regs[UREG_I1] = orig_i1;
	301
	302	return ret;
1da177e4 LT	303	}
	304
	305	/* Copy a Sparc thread. The fork() return value conventions
	306	* under SunOS are nothing short of bletcherous:
	307	* Parent --> %o0 == childs pid, %o1 == 0
	308	* Child --> %o0 == parents pid, %o1 == 1
	309	*
	310	* NOTE: We have a separate fork kpsr/kwim because
	311	* the parent could change these values between
	312	* sys_fork invocation and when we reach here
	313	* if the parent should sleep while trying to
	314	* allocate the task_struct and kernel stack in
	315	* do_fork().
	316	* XXX See comment above sys_vfork in sparc64. todo.
	317	*/
	318	extern void ret_from_fork(void);
	319
6f2c55b8	320	int copy_thread(unsigned long clone_flags, unsigned long sp,
1da177e4 LT	321	unsigned long unused,
	322	struct task_struct p, struct pt_regs regs)
	323	{
36483c6b	324	struct thread_info *ti = task_thread_info(p);
1da177e4 LT	325	struct pt_regs *childregs;
	326	char *new_stack;
	327
	328	#ifndef CONFIG_SMP
	329	if(last_task_used_math == current) {
	330	#else
54f565ea	331	if (test_thread_flag(TIF_USEDFPU)) {
1da177e4 LT	332	#endif
	333	put_psr(get_psr() \| PSR_EF);
	334	fpsave(&p->thread.float_regs[0], &p->thread.fsr,
	335	&p->thread.fpqueue[0], &p->thread.fpqdepth);
	336	#ifdef CONFIG_SMP
54f565ea	337	clear_thread_flag(TIF_USEDFPU);
1da177e4 LT	338	#endif
	339	}
	340
	341	/*
	342	* p->thread_info new_stack childregs
	343	* ! ! ! {if(PSR_PS) }
	344	* V V (stk.fr.) V (pt_regs) { (stk.fr.) }
	345	* +----- - - - - - ------+===========+============={+==========}+
	346	*/
36483c6b	347	new_stack = task_stack_page(p) + THREAD_SIZE;
1da177e4 LT	348	if (regs->psr & PSR_PS)
	349	new_stack -= STACKFRAME_SZ;
	350	new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
	351	memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
	352	childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
	353
	354	/*
	355	* A new process must start with interrupts closed in 2.5,
	356	* because this is how Mingo's scheduler works (see schedule_tail
	357	* and finish_arch_switch). If we do not do it, a timer interrupt hits
	358	* before we unlock, attempts to re-take the rq->lock, and then we die.
	359	* Thus, kpsr\|=PSR_PIL.
	360	*/
	361	ti->ksp = (unsigned long) new_stack;
	362	ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
	363	ti->kpsr = current->thread.fork_kpsr \| PSR_PIL;
	364	ti->kwim = current->thread.fork_kwim;
	365
	366	if(regs->psr & PSR_PS) {
	367	extern struct pt_regs fake_swapper_regs;
	368
	369	p->thread.kregs = &fake_swapper_regs;
	370	new_stack += STACKFRAME_SZ + TRACEREG_SZ;
	371	childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
	372	p->thread.flags \|= SPARC_FLAG_KTHREAD;
	373	p->thread.current_ds = KERNEL_DS;
	374	memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
	375	childregs->u_regs[UREG_G6] = (unsigned long) ti;
	376	} else {
	377	p->thread.kregs = childregs;
	378	childregs->u_regs[UREG_FP] = sp;
	379	p->thread.flags &= ~SPARC_FLAG_KTHREAD;
	380	p->thread.current_ds = USER_DS;
	381
	382	if (sp != regs->u_regs[UREG_FP]) {
	383	struct sparc_stackf __user *childstack;
	384	struct sparc_stackf __user *parentstack;
	385
	386	/*
	387	* This is a clone() call with supplied user stack.
	388	* Set some valid stack frames to give to the child.
	389	*/
	390	childstack = (struct sparc_stackf __user *)
440ab7ac	391	(sp & ~0xfUL);
1da177e4 LT	392	parentstack = (struct sparc_stackf __user *)
	393	regs->u_regs[UREG_FP];
	394
	395	#if 0
	396	printk("clone: parent stack:\n");
	397	show_stackframe(parentstack);
	398	#endif
	399
	400	childstack = clone_stackframe(childstack, parentstack);
	401	if (!childstack)
	402	return -EFAULT;
	403
	404	#if 0
	405	printk("clone: child stack:\n");
	406	show_stackframe(childstack);
	407	#endif
	408
	409	childregs->u_regs[UREG_FP] = (unsigned long)childstack;
	410	}
	411	}
	412
	413	#ifdef CONFIG_SMP
	414	/* FPU must be disabled on SMP. */
	415	childregs->psr &= ~PSR_EF;
	416	#endif
	417
	418	/* Set the return value for the child. */
	419	childregs->u_regs[UREG_I0] = current->pid;
	420	childregs->u_regs[UREG_I1] = 1;
	421
	422	/* Set the return value for the parent. */
	423	regs->u_regs[UREG_I1] = 0;
	424
	425	if (clone_flags & CLONE_SETTLS)
	426	childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
	427
	428	return 0;
	429	}
	430
1da177e4 LT	431	/*
	432	* fill in the fpu structure for a core dump.
	433	*/
	434	int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
	435	{
	436	if (used_math()) {
	437	memset(fpregs, 0, sizeof(*fpregs));
	438	fpregs->pr_q_entrysize = 8;
	439	return 1;
	440	}
	441	#ifdef CONFIG_SMP
54f565ea	442	if (test_thread_flag(TIF_USEDFPU)) {
1da177e4 LT	443	put_psr(get_psr() \| PSR_EF);
	444	fpsave(&current->thread.float_regs[0], &current->thread.fsr,
	445	&current->thread.fpqueue[0], &current->thread.fpqdepth);
	446	if (regs != NULL) {
	447	regs->psr &= ~(PSR_EF);
54f565ea	448	clear_thread_flag(TIF_USEDFPU);
1da177e4 LT	449	}
	450	}
	451	#else
	452	if (current == last_task_used_math) {
	453	put_psr(get_psr() \| PSR_EF);
	454	fpsave(&current->thread.float_regs[0], &current->thread.fsr,
	455	&current->thread.fpqueue[0], &current->thread.fpqdepth);
	456	if (regs != NULL) {
	457	regs->psr &= ~(PSR_EF);
	458	last_task_used_math = NULL;
	459	}
	460	}
	461	#endif
	462	memcpy(&fpregs->pr_fr.pr_regs[0],
	463	&current->thread.float_regs[0],
	464	(sizeof(unsigned long) * 32));
	465	fpregs->pr_fsr = current->thread.fsr;
	466	fpregs->pr_qcnt = current->thread.fpqdepth;
	467	fpregs->pr_q_entrysize = 8;
	468	fpregs->pr_en = 1;
	469	if(fpregs->pr_qcnt != 0) {
	470	memcpy(&fpregs->pr_q[0],
	471	&current->thread.fpqueue[0],
	472	sizeof(struct fpq) * fpregs->pr_qcnt);
	473	}
	474	/* Zero out the rest. */
	475	memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
	476	sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
	477	return 1;
	478	}
	479
	480	/*
	481	* sparc_execve() executes a new program after the asm stub has set
	482	* things up for us. This should basically do what I want it to.
	483	*/
	484	asmlinkage int sparc_execve(struct pt_regs *regs)
	485	{
	486	int error, base = 0;
	487	char *filename;
	488
	489	/* Check for indirect call. */
	490	if(regs->u_regs[UREG_G1] == 0)
	491	base = 1;
	492
	493	filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
	494	error = PTR_ERR(filename);
	495	if(IS_ERR(filename))
	496	goto out;
	497	error = do_execve(filename,
d7627467 DH	498	(const char __user const __user )
	499	regs->u_regs[base + UREG_I1],
	500	(const char __user const __user )
	501	regs->u_regs[base + UREG_I2],
1da177e4 LT	502	regs);
1da177e4 LT	503	putname(filename);
1da177e4 LT	504	out:
	505	return error;
	506	}
	507
	508	/*
	509	* This is the mechanism for creating a new kernel thread.
	510	*
	511	* NOTE! Only a kernel-only process(ie the swapper or direct descendants
	512	* who haven't done an "execve()") should use this: it will work within
	513	* a system call from a "real" process, but the process memory space will
d1a78c32	514	* not be freed until both the parent and the child have exited.
1da177e4 LT	515	*/
	516	pid_t kernel_thread(int (fn)(void ), void * arg, unsigned long flags)
	517	{
	518	long retval;
	519
	520	__asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */
	521	"mov %5, %%g3\n\t" /* and arg. */
	522	"mov %1, %%g1\n\t"
	523	"mov %2, %%o0\n\t" /* Clone flags. */
	524	"mov 0, %%o1\n\t" /* usp arg == 0 */
	525	"t 0x10\n\t" /* Linux/Sparc clone(). */
	526	"cmp %%o1, 0\n\t"
	527	"be 1f\n\t" /* The parent, just return. */
	528	" nop\n\t" /* Delay slot. */
	529	"jmpl %%g2, %%o7\n\t" /* Call the function. */
	530	" mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
	531	"mov %3, %%g1\n\t"
	532	"t 0x10\n\t" /* Linux/Sparc exit(). */
	533	/* Notreached by child. */
	534	"1: mov %%o0, %0\n\t" :
	535	"=r" (retval) :
	536	"i" (__NR_clone), "r" (flags \| CLONE_VM \| CLONE_UNTRACED),
	537	"i" (__NR_exit), "r" (fn), "r" (arg) :
	538	"g1", "g2", "g3", "o0", "o1", "memory", "cc");
	539	return retval;
	540	}
6943f3da	541	EXPORT_SYMBOL(kernel_thread);
1da177e4 LT	542
	543	unsigned long get_wchan(struct task_struct *task)
	544	{
	545	unsigned long pc, fp, bias = 0;
	546	unsigned long task_base = (unsigned long) task;
	547	unsigned long ret = 0;
4d7b92ad	548	struct reg_window32 *rw;
1da177e4 LT	549	int count = 0;
	550
	551	if (!task \|\| task == current \|\|
	552	task->state == TASK_RUNNING)
	553	goto out;
	554
d562ef6a	555	fp = task_thread_info(task)->ksp + bias;
1da177e4 LT	556	do {
	557	/* Bogus frame pointer? */
	558	if (fp < (task_base + sizeof(struct thread_info)) \|\|
	559	fp >= (task_base + (2 * PAGE_SIZE)))
	560	break;
4d7b92ad	561	rw = (struct reg_window32 *) fp;
1da177e4 LT	562	pc = rw->ins[7];
	563	if (!in_sched_functions(pc)) {
	564	ret = pc;
	565	goto out;
	566	}
	567	fp = rw->ins[6] + bias;
	568	} while (++count < 16);
	569
	570	out:
	571	return ret;
	572	}
	573