[mirror_ubuntu-bionic-kernel.git] / arch / sh / kernel / process_64.c

/*
 * arch/sh/kernel/process_64.c
 *
 * This file handles the architecture-dependent parts of process handling..
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003 - 2007  Paul Mundt
 * Copyright (C) 2003, 2004 Richard Curnow
 *
 * Started from SH3/4 version:
 *   Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 *
 *   In turn started from i386 version:
 *     Copyright (C) 1995  Linus Torvalds
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/ptrace.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/io.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>

struct task_struct *last_task_used_math = NULL;

static int hlt_counter = 1;

#define HARD_IDLE_TIMEOUT (HZ / 3)

void disable_hlt(void)
{
	hlt_counter++;
}

void enable_hlt(void)
{
	hlt_counter--;
}

static int __init nohlt_setup(char *__unused)
{
	hlt_counter = 1;
	return 1;
}

static int __init hlt_setup(char *__unused)
{
	hlt_counter = 0;
	return 1;
}

__setup("nohlt", nohlt_setup);
__setup("hlt", hlt_setup);

static inline void hlt(void)
{
	__asm__ __volatile__ ("sleep" : : : "memory");
}

/*
 * The idle loop on a uniprocessor SH..
 */
void cpu_idle(void)
{
	/* endless idle loop with no priority at all */
	while (1) {
		if (hlt_counter) {
			while (!need_resched())
				cpu_relax();
		} else {
			local_irq_disable();
			while (!need_resched()) {
				local_irq_enable();
				hlt();
				local_irq_disable();
			}
			local_irq_enable();
		}
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}

}

void machine_restart(char * __unused)
{
	extern void phys_stext(void);

	phys_stext();
}

void machine_halt(void)
{
	for (;;);
}

void machine_power_off(void)
{
#if 0
	/* Disable watchdog timer */
	ctrl_outl(0xa5000000, WTCSR);
	/* Configure deep standby on sleep */
	ctrl_outl(0x03, STBCR);
#endif

	__asm__ __volatile__ (
		"sleep\n\t"
		"synci\n\t"
		"nop;nop;nop;nop\n\t"
	);

	panic("Unexpected wakeup!\n");
}

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

void show_regs(struct pt_regs * regs)
{
	unsigned long long ah, al, bh, bl, ch, cl;

	printk("\n");

	ah = (regs->pc) >> 32;
	al = (regs->pc) & 0xffffffff;
	bh = (regs->regs[18]) >> 32;
	bl = (regs->regs[18]) & 0xffffffff;
	ch = (regs->regs[15]) >> 32;
	cl = (regs->regs[15]) & 0xffffffff;
	printk("PC  : %08Lx%08Lx LINK: %08Lx%08Lx SP  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->sr) >> 32;
	al = (regs->sr) & 0xffffffff;
        asm volatile ("getcon   " __TEA ", %0" : "=r" (bh));
        asm volatile ("getcon   " __TEA ", %0" : "=r" (bl));
	bh = (bh) >> 32;
	bl = (bl) & 0xffffffff;
        asm volatile ("getcon   " __KCR0 ", %0" : "=r" (ch));
        asm volatile ("getcon   " __KCR0 ", %0" : "=r" (cl));
	ch = (ch) >> 32;
	cl = (cl) & 0xffffffff;
	printk("SR  : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[0]) >> 32;
	al = (regs->regs[0]) & 0xffffffff;
	bh = (regs->regs[1]) >> 32;
	bl = (regs->regs[1]) & 0xffffffff;
	ch = (regs->regs[2]) >> 32;
	cl = (regs->regs[2]) & 0xffffffff;
	printk("R0  : %08Lx%08Lx R1  : %08Lx%08Lx R2  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[3]) >> 32;
	al = (regs->regs[3]) & 0xffffffff;
	bh = (regs->regs[4]) >> 32;
	bl = (regs->regs[4]) & 0xffffffff;
	ch = (regs->regs[5]) >> 32;
	cl = (regs->regs[5]) & 0xffffffff;
	printk("R3  : %08Lx%08Lx R4  : %08Lx%08Lx R5  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[6]) >> 32;
	al = (regs->regs[6]) & 0xffffffff;
	bh = (regs->regs[7]) >> 32;
	bl = (regs->regs[7]) & 0xffffffff;
	ch = (regs->regs[8]) >> 32;
	cl = (regs->regs[8]) & 0xffffffff;
	printk("R6  : %08Lx%08Lx R7  : %08Lx%08Lx R8  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[9]) >> 32;
	al = (regs->regs[9]) & 0xffffffff;
	bh = (regs->regs[10]) >> 32;
	bl = (regs->regs[10]) & 0xffffffff;
	ch = (regs->regs[11]) >> 32;
	cl = (regs->regs[11]) & 0xffffffff;
	printk("R9  : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[12]) >> 32;
	al = (regs->regs[12]) & 0xffffffff;
	bh = (regs->regs[13]) >> 32;
	bl = (regs->regs[13]) & 0xffffffff;
	ch = (regs->regs[14]) >> 32;
	cl = (regs->regs[14]) & 0xffffffff;
	printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[16]) >> 32;
	al = (regs->regs[16]) & 0xffffffff;
	bh = (regs->regs[17]) >> 32;
	bl = (regs->regs[17]) & 0xffffffff;
	ch = (regs->regs[19]) >> 32;
	cl = (regs->regs[19]) & 0xffffffff;
	printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[20]) >> 32;
	al = (regs->regs[20]) & 0xffffffff;
	bh = (regs->regs[21]) >> 32;
	bl = (regs->regs[21]) & 0xffffffff;
	ch = (regs->regs[22]) >> 32;
	cl = (regs->regs[22]) & 0xffffffff;
	printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[23]) >> 32;
	al = (regs->regs[23]) & 0xffffffff;
	bh = (regs->regs[24]) >> 32;
	bl = (regs->regs[24]) & 0xffffffff;
	ch = (regs->regs[25]) >> 32;
	cl = (regs->regs[25]) & 0xffffffff;
	printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[26]) >> 32;
	al = (regs->regs[26]) & 0xffffffff;
	bh = (regs->regs[27]) >> 32;
	bl = (regs->regs[27]) & 0xffffffff;
	ch = (regs->regs[28]) >> 32;
	cl = (regs->regs[28]) & 0xffffffff;
	printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[29]) >> 32;
	al = (regs->regs[29]) & 0xffffffff;
	bh = (regs->regs[30]) >> 32;
	bl = (regs->regs[30]) & 0xffffffff;
	ch = (regs->regs[31]) >> 32;
	cl = (regs->regs[31]) & 0xffffffff;
	printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[32]) >> 32;
	al = (regs->regs[32]) & 0xffffffff;
	bh = (regs->regs[33]) >> 32;
	bl = (regs->regs[33]) & 0xffffffff;
	ch = (regs->regs[34]) >> 32;
	cl = (regs->regs[34]) & 0xffffffff;
	printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[35]) >> 32;
	al = (regs->regs[35]) & 0xffffffff;
	bh = (regs->regs[36]) >> 32;
	bl = (regs->regs[36]) & 0xffffffff;
	ch = (regs->regs[37]) >> 32;
	cl = (regs->regs[37]) & 0xffffffff;
	printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[38]) >> 32;
	al = (regs->regs[38]) & 0xffffffff;
	bh = (regs->regs[39]) >> 32;
	bl = (regs->regs[39]) & 0xffffffff;
	ch = (regs->regs[40]) >> 32;
	cl = (regs->regs[40]) & 0xffffffff;
	printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[41]) >> 32;
	al = (regs->regs[41]) & 0xffffffff;
	bh = (regs->regs[42]) >> 32;
	bl = (regs->regs[42]) & 0xffffffff;
	ch = (regs->regs[43]) >> 32;
	cl = (regs->regs[43]) & 0xffffffff;
	printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[44]) >> 32;
	al = (regs->regs[44]) & 0xffffffff;
	bh = (regs->regs[45]) >> 32;
	bl = (regs->regs[45]) & 0xffffffff;
	ch = (regs->regs[46]) >> 32;
	cl = (regs->regs[46]) & 0xffffffff;
	printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[47]) >> 32;
	al = (regs->regs[47]) & 0xffffffff;
	bh = (regs->regs[48]) >> 32;
	bl = (regs->regs[48]) & 0xffffffff;
	ch = (regs->regs[49]) >> 32;
	cl = (regs->regs[49]) & 0xffffffff;
	printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[50]) >> 32;
	al = (regs->regs[50]) & 0xffffffff;
	bh = (regs->regs[51]) >> 32;
	bl = (regs->regs[51]) & 0xffffffff;
	ch = (regs->regs[52]) >> 32;
	cl = (regs->regs[52]) & 0xffffffff;
	printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[53]) >> 32;
	al = (regs->regs[53]) & 0xffffffff;
	bh = (regs->regs[54]) >> 32;
	bl = (regs->regs[54]) & 0xffffffff;
	ch = (regs->regs[55]) >> 32;
	cl = (regs->regs[55]) & 0xffffffff;
	printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[56]) >> 32;
	al = (regs->regs[56]) & 0xffffffff;
	bh = (regs->regs[57]) >> 32;
	bl = (regs->regs[57]) & 0xffffffff;
	ch = (regs->regs[58]) >> 32;
	cl = (regs->regs[58]) & 0xffffffff;
	printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[59]) >> 32;
	al = (regs->regs[59]) & 0xffffffff;
	bh = (regs->regs[60]) >> 32;
	bl = (regs->regs[60]) & 0xffffffff;
	ch = (regs->regs[61]) >> 32;
	cl = (regs->regs[61]) & 0xffffffff;
	printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[62]) >> 32;
	al = (regs->regs[62]) & 0xffffffff;
	bh = (regs->tregs[0]) >> 32;
	bl = (regs->tregs[0]) & 0xffffffff;
	ch = (regs->tregs[1]) >> 32;
	cl = (regs->tregs[1]) & 0xffffffff;
	printk("R62 : %08Lx%08Lx T0  : %08Lx%08Lx T1  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->tregs[2]) >> 32;
	al = (regs->tregs[2]) & 0xffffffff;
	bh = (regs->tregs[3]) >> 32;
	bl = (regs->tregs[3]) & 0xffffffff;
	ch = (regs->tregs[4]) >> 32;
	cl = (regs->tregs[4]) & 0xffffffff;
	printk("T2  : %08Lx%08Lx T3  : %08Lx%08Lx T4  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->tregs[5]) >> 32;
	al = (regs->tregs[5]) & 0xffffffff;
	bh = (regs->tregs[6]) >> 32;
	bl = (regs->tregs[6]) & 0xffffffff;
	ch = (regs->tregs[7]) >> 32;
	cl = (regs->tregs[7]) & 0xffffffff;
	printk("T5  : %08Lx%08Lx T6  : %08Lx%08Lx T7  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	/*
	 * If we're in kernel mode, dump the stack too..
	 */
	if (!user_mode(regs)) {
		void show_stack(struct task_struct *tsk, unsigned long *sp);
		unsigned long sp = regs->regs[15] & 0xffffffff;
		struct task_struct *tsk = get_current();

		tsk->thread.kregs = regs;

		show_stack(tsk, (unsigned long *)sp);
	}
}

struct task_struct * alloc_task_struct(void)
{
	/* Get task descriptor pages */
	return (struct task_struct *)
		__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE));
}

void free_task_struct(struct task_struct *p)
{
	free_pages((unsigned long) p, get_order(THREAD_SIZE));
}

/*
 * Create a kernel thread
 */
ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
{
	do_exit(fn(arg));
}

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

	memset(&regs, 0, sizeof(regs));
	regs.regs[2] = (unsigned long)arg;
	regs.regs[3] = (unsigned long)fn;

	regs.pc = (unsigned long)kernel_thread_helper;
	regs.sr = (1 << 30);

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

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
	/* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC.

	   The SH-5 FPU save/restore approach relies on last_task_used_math
	   pointing to a live task_struct.  When another task tries to use the
	   FPU for the 1st time, the FPUDIS trap handling (see
	   arch/sh64/kernel/fpu.c) will save the existing FPU state to the
	   FP regs field within last_task_used_math before re-loading the new
	   task's FPU state (or initialising it if the FPU has been used
	   before).  So if last_task_used_math is stale, and its page has already been
	   re-allocated for another use, the consequences are rather grim. Unless we
	   null it here, there is no other path through which it would get safely
	   nulled. */

#ifdef CONFIG_SH_FPU
	if (last_task_used_math == current) {
		last_task_used_math = NULL;
	}
#endif
}

void flush_thread(void)
{

	/* Called by fs/exec.c (flush_old_exec) to remove traces of a
	 * previously running executable. */
#ifdef CONFIG_SH_FPU
	if (last_task_used_math == current) {
		last_task_used_math = NULL;
	}
	/* Force FPU state to be reinitialised after exec */
	clear_used_math();
#endif

	/* if we are a kernel thread, about to change to user thread,
         * update kreg
         */
	if(current->thread.kregs==&fake_swapper_regs) {
          current->thread.kregs =
             ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
	  current->thread.uregs = current->thread.kregs;
	}
}

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

/* Fill in the fpu structure for a core dump.. */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
{
#ifdef CONFIG_SH_FPU
	int fpvalid;
	struct task_struct *tsk = current;

	fpvalid = !!tsk_used_math(tsk);
	if (fpvalid) {
		if (current == last_task_used_math) {
			enable_fpu();
			save_fpu(tsk, regs);
			disable_fpu();
			last_task_used_math = 0;
			regs->sr |= SR_FD;
		}

		memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
	}

	return fpvalid;
#else
	return 0; /* Task didn't use the fpu at all. */
#endif
}

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;
	unsigned long long se;			/* Sign extension */

#ifdef CONFIG_SH_FPU
	if(last_task_used_math == current) {
		enable_fpu();
		save_fpu(current, regs);
		disable_fpu();
		last_task_used_math = NULL;
		regs->sr |= SR_FD;
	}
#endif
	/* Copy from sh version */
	childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;

	*childregs = *regs;

	if (user_mode(regs)) {
		childregs->regs[15] = usp;
		p->thread.uregs = childregs;
	} else {
		childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE;
	}

	childregs->regs[9] = 0; /* Set return value for child */
	childregs->sr |= SR_FD; /* Invalidate FPU flag */

	p->thread.sp = (unsigned long) childregs;
	p->thread.pc = (unsigned long) ret_from_fork;

	/*
	 * Sign extend the edited stack.
         * Note that thread.pc and thread.pc will stay
	 * 32-bit wide and context switch must take care
	 * of NEFF sign extension.
	 */

	se = childregs->regs[15];
	se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se;
	childregs->regs[15] = se;

	return 0;
}

asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
			unsigned long r4, unsigned long r5,
			unsigned long r6, unsigned long r7,
			struct pt_regs *pregs)
{
	return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
}

asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
			 unsigned long r4, unsigned long r5,
			 unsigned long r6, unsigned long r7,
			 struct pt_regs *pregs)
{
	if (!newsp)
		newsp = pregs->regs[15];
	return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
}

/*
 * This is trivial, and on the face of it looks like it
 * could equally well be done in user mode.
 *
 * Not so, for quite unobvious reasons - register pressure.
 * In user mode vfork() cannot have a stack frame, and if
 * done by calling the "clone()" system call directly, you
 * do not have enough call-clobbered registers to hold all
 * the information you need.
 */
asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
			 unsigned long r4, unsigned long r5,
			 unsigned long r6, unsigned long r7,
			 struct pt_regs *pregs)
{
	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(char *ufilename, char **uargv,
			  char **uenvp, unsigned long r5,
			  unsigned long r6, unsigned long r7,
			  struct pt_regs *pregs)
{
	int error;
	char *filename;

	lock_kernel();
	filename = getname((char __user *)ufilename);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;

	error = do_execve(filename,
			  (char __user * __user *)uargv,
			  (char __user * __user *)uenvp,
			  pregs);
	if (error == 0) {
		task_lock(current);
		current->ptrace &= ~PT_DTRACE;
		task_unlock(current);
	}
	putname(filename);
out:
	unlock_kernel();
	return error;
}

/*
 * These bracket the sleeping functions..
 */
extern void interruptible_sleep_on(wait_queue_head_t *q);

#define mid_sched	((unsigned long) interruptible_sleep_on)

static int in_sh64_switch_to(unsigned long pc)
{
	extern char __sh64_switch_to_end;
	/* For a sleeping task, the PC is somewhere in the middle of the function,
	   so we don't have to worry about masking the LSB off */
	return (pc >= (unsigned long) sh64_switch_to) &&
	       (pc < (unsigned long) &__sh64_switch_to_end);
}

unsigned long get_wchan(struct task_struct *p)
{
	unsigned long schedule_fp;
	unsigned long sh64_switch_to_fp;
	unsigned long schedule_caller_pc;
	unsigned long pc;

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

	/*
	 * The same comment as on the Alpha applies here, too ...
	 */
	pc = thread_saved_pc(p);

#ifdef CONFIG_FRAME_POINTER
	if (in_sh64_switch_to(pc)) {
		sh64_switch_to_fp = (long) p->thread.sp;
		/* r14 is saved at offset 4 in the sh64_switch_to frame */
		schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);

		/* and the caller of 'schedule' is (currently!) saved at offset 24
		   in the frame of schedule (from disasm) */
		schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
		return schedule_caller_pc;
	}
#endif
	return pc;
}

/* Provide a /proc/asids file that lists out the
   ASIDs currently associated with the processes.  (If the DM.PC register is
   examined through the debug link, this shows ASID + PC.  To make use of this,
   the PID->ASID relationship needs to be known.  This is primarily for
   debugging.)
   */

#if defined(CONFIG_SH64_PROC_ASIDS)
static int
asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data)
{
	int len=0;
	struct task_struct *p;
	read_lock(&tasklist_lock);
	for_each_process(p) {
		int pid = p->pid;

		if (!pid)
			continue;
		if (p->mm)
			len += sprintf(buf+len, "%5d : %02lx\n", pid,
				       asid_cache(smp_processor_id()));
		else
			len += sprintf(buf+len, "%5d : (none)\n", pid);
	}
	read_unlock(&tasklist_lock);
	*eof = 1;
	return len;
}

static int __init register_proc_asids(void)
{
	create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL);
	return 0;
}
__initcall(register_proc_asids);
#endif
Commit	Line	Data
1da177e4	1	/*
5a4f7c66	2	* arch/sh/kernel/process_64.c
1da177e4	3	*
5a4f7c66	4	* This file handles the architecture-dependent parts of process handling..
1da177e4 LT	5	*
1da177e4 LT	6	* Copyright (C) 2000, 2001 Paolo Alberelli
5a4f7c66	7	* Copyright (C) 2003 - 2007 Paul Mundt
1da177e4 LT	8	* Copyright (C) 2003, 2004 Richard Curnow
	9	*
	10	* Started from SH3/4 version:
	11	* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
	12	*
	13	* In turn started from i386 version:
	14	* Copyright (C) 1995 Linus Torvalds
	15	*
5a4f7c66 PM	16	* This file is subject to the terms and conditions of the GNU General Public
	17	* License. See the file "COPYING" in the main directory of this archive
	18	* for more details.
1da177e4	19	*/
1da177e4	20	#include <linux/mm.h>
78d98277	21	#include <linux/fs.h>
1da177e4	22	#include <linux/ptrace.h>
1da177e4 LT	23	#include <linux/reboot.h>
1da177e4 LT	24	#include <linux/init.h>
821278a7	25	#include <linux/module.h>
c26056bc	26	#include <linux/proc_fs.h>
a7aa92d1	27	#include <linux/io.h>
1da177e4 LT	28	#include <asm/uaccess.h>
1da177e4 LT	29	#include <asm/pgtable.h>
df0fb256	30	#include <asm/mmu_context.h>
1da177e4 LT	31
	32	struct task_struct *last_task_used_math = NULL;
	33
1da177e4 LT	34	static int hlt_counter = 1;
	35
	36	#define HARD_IDLE_TIMEOUT (HZ / 3)
	37
	38	void disable_hlt(void)
	39	{
	40	hlt_counter++;
	41	}
	42
	43	void enable_hlt(void)
	44	{
	45	hlt_counter--;
	46	}
	47
	48	static int __init nohlt_setup(char *__unused)
	49	{
	50	hlt_counter = 1;
	51	return 1;
	52	}
	53
	54	static int __init hlt_setup(char *__unused)
	55	{
	56	hlt_counter = 0;
	57	return 1;
	58	}
	59
	60	__setup("nohlt", nohlt_setup);
	61	__setup("hlt", hlt_setup);
	62
	63	static inline void hlt(void)
	64	{
1da177e4 LT	65	__asm__ __volatile__ ("sleep" : : : "memory");
	66	}
	67
	68	/*
	69	* The idle loop on a uniprocessor SH..
	70	*/
64c7c8f8	71	void cpu_idle(void)
1da177e4 LT	72	{
	73	/* endless idle loop with no priority at all */
	74	while (1) {
	75	if (hlt_counter) {
64c7c8f8 NP	76	while (!need_resched())
64c7c8f8 NP	77	cpu_relax();
1da177e4 LT	78	} else {
	79	local_irq_disable();
	80	while (!need_resched()) {
	81	local_irq_enable();
1da177e4 LT	82	hlt();
	83	local_irq_disable();
	84	}
	85	local_irq_enable();
	86	}
5bfb5d69	87	preempt_enable_no_resched();
1da177e4	88	schedule();
5bfb5d69	89	preempt_disable();
1da177e4	90	}
1da177e4	91
1da177e4 LT	92	}
	93
	94	void machine_restart(char * __unused)
	95	{
	96	extern void phys_stext(void);
	97
	98	phys_stext();
	99	}
	100
	101	void machine_halt(void)
	102	{
	103	for (;;);
	104	}
	105
	106	void machine_power_off(void)
	107	{
a7aa92d1 PM	108	#if 0
	109	/* Disable watchdog timer */
	110	ctrl_outl(0xa5000000, WTCSR);
	111	/* Configure deep standby on sleep */
	112	ctrl_outl(0x03, STBCR);
	113	#endif
	114
	115	__asm__ __volatile__ (
	116	"sleep\n\t"
	117	"synci\n\t"
	118	"nop;nop;nop;nop\n\t"
	119	);
	120
	121	panic("Unexpected wakeup!\n");
1da177e4 LT	122	}
1da177e4 LT	123
1bb99a64 PM	124	void (*pm_power_off)(void) = machine_power_off;
	125	EXPORT_SYMBOL(pm_power_off);
	126
1da177e4 LT	127	void show_regs(struct pt_regs * regs)
	128	{
	129	unsigned long long ah, al, bh, bl, ch, cl;
	130
	131	printk("\n");
	132
	133	ah = (regs->pc) >> 32;
	134	al = (regs->pc) & 0xffffffff;
	135	bh = (regs->regs[18]) >> 32;
	136	bl = (regs->regs[18]) & 0xffffffff;
	137	ch = (regs->regs[15]) >> 32;
	138	cl = (regs->regs[15]) & 0xffffffff;
	139	printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
	140	ah, al, bh, bl, ch, cl);
	141
	142	ah = (regs->sr) >> 32;
	143	al = (regs->sr) & 0xffffffff;
	144	asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
	145	asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
	146	bh = (bh) >> 32;
	147	bl = (bl) & 0xffffffff;
	148	asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
	149	asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
	150	ch = (ch) >> 32;
	151	cl = (cl) & 0xffffffff;
	152	printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
	153	ah, al, bh, bl, ch, cl);
	154
	155	ah = (regs->regs[0]) >> 32;
	156	al = (regs->regs[0]) & 0xffffffff;
	157	bh = (regs->regs[1]) >> 32;
	158	bl = (regs->regs[1]) & 0xffffffff;
	159	ch = (regs->regs[2]) >> 32;
	160	cl = (regs->regs[2]) & 0xffffffff;
	161	printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
	162	ah, al, bh, bl, ch, cl);
	163
	164	ah = (regs->regs[3]) >> 32;
	165	al = (regs->regs[3]) & 0xffffffff;
	166	bh = (regs->regs[4]) >> 32;
	167	bl = (regs->regs[4]) & 0xffffffff;
	168	ch = (regs->regs[5]) >> 32;
	169	cl = (regs->regs[5]) & 0xffffffff;
	170	printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
	171	ah, al, bh, bl, ch, cl);
	172
	173	ah = (regs->regs[6]) >> 32;
	174	al = (regs->regs[6]) & 0xffffffff;
	175	bh = (regs->regs[7]) >> 32;
	176	bl = (regs->regs[7]) & 0xffffffff;
	177	ch = (regs->regs[8]) >> 32;
	178	cl = (regs->regs[8]) & 0xffffffff;
	179	printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
	180	ah, al, bh, bl, ch, cl);
	181
	182	ah = (regs->regs[9]) >> 32;
	183	al = (regs->regs[9]) & 0xffffffff;
	184	bh = (regs->regs[10]) >> 32;
	185	bl = (regs->regs[10]) & 0xffffffff;
	186	ch = (regs->regs[11]) >> 32;
	187	cl = (regs->regs[11]) & 0xffffffff;
	188	printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
	189	ah, al, bh, bl, ch, cl);
	190
191	ah = (regs->regs[12]) >> 32;
192	al = (regs->regs[12]) & 0xffffffff;
193	bh = (regs->regs[13]) >> 32;
194	bl = (regs->regs[13]) & 0xffffffff;
195	ch = (regs->regs[14]) >> 32;
196	cl = (regs->regs[14]) & 0xffffffff;
197	printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
198	ah, al, bh, bl, ch, cl);
199
200	ah = (regs->regs[16]) >> 32;
201	al = (regs->regs[16]) & 0xffffffff;
202	bh = (regs->regs[17]) >> 32;
203	bl = (regs->regs[17]) & 0xffffffff;
204	ch = (regs->regs[19]) >> 32;
205	cl = (regs->regs[19]) & 0xffffffff;
206	printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
207	ah, al, bh, bl, ch, cl);
208
209	ah = (regs->regs[20]) >> 32;
210	al = (regs->regs[20]) & 0xffffffff;
211	bh = (regs->regs[21]) >> 32;
212	bl = (regs->regs[21]) & 0xffffffff;
213	ch = (regs->regs[22]) >> 32;
214	cl = (regs->regs[22]) & 0xffffffff;
215	printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
216	ah, al, bh, bl, ch, cl);
217
218	ah = (regs->regs[23]) >> 32;
219	al = (regs->regs[23]) & 0xffffffff;
220	bh = (regs->regs[24]) >> 32;
221	bl = (regs->regs[24]) & 0xffffffff;
222	ch = (regs->regs[25]) >> 32;
223	cl = (regs->regs[25]) & 0xffffffff;
224	printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
225	ah, al, bh, bl, ch, cl);
226
227	ah = (regs->regs[26]) >> 32;
228	al = (regs->regs[26]) & 0xffffffff;
229	bh = (regs->regs[27]) >> 32;
230	bl = (regs->regs[27]) & 0xffffffff;
231	ch = (regs->regs[28]) >> 32;
232	cl = (regs->regs[28]) & 0xffffffff;
233	printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
234	ah, al, bh, bl, ch, cl);
235
236	ah = (regs->regs[29]) >> 32;
237	al = (regs->regs[29]) & 0xffffffff;
238	bh = (regs->regs[30]) >> 32;
239	bl = (regs->regs[30]) & 0xffffffff;
240	ch = (regs->regs[31]) >> 32;
241	cl = (regs->regs[31]) & 0xffffffff;
242	printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
243	ah, al, bh, bl, ch, cl);
244
245	ah = (regs->regs[32]) >> 32;
246	al = (regs->regs[32]) & 0xffffffff;
247	bh = (regs->regs[33]) >> 32;
248	bl = (regs->regs[33]) & 0xffffffff;
249	ch = (regs->regs[34]) >> 32;
250	cl = (regs->regs[34]) & 0xffffffff;
251	printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
252	ah, al, bh, bl, ch, cl);
253
254	ah = (regs->regs[35]) >> 32;
255	al = (regs->regs[35]) & 0xffffffff;
256	bh = (regs->regs[36]) >> 32;
257	bl = (regs->regs[36]) & 0xffffffff;
258	ch = (regs->regs[37]) >> 32;
259	cl = (regs->regs[37]) & 0xffffffff;
260	printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
261	ah, al, bh, bl, ch, cl);
262
263	ah = (regs->regs[38]) >> 32;
264	al = (regs->regs[38]) & 0xffffffff;
265	bh = (regs->regs[39]) >> 32;
266	bl = (regs->regs[39]) & 0xffffffff;
267	ch = (regs->regs[40]) >> 32;
268	cl = (regs->regs[40]) & 0xffffffff;
269	printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
270	ah, al, bh, bl, ch, cl);
271
272	ah = (regs->regs[41]) >> 32;
273	al = (regs->regs[41]) & 0xffffffff;
274	bh = (regs->regs[42]) >> 32;
275	bl = (regs->regs[42]) & 0xffffffff;
276	ch = (regs->regs[43]) >> 32;
277	cl = (regs->regs[43]) & 0xffffffff;
278	printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
279	ah, al, bh, bl, ch, cl);
280
281	ah = (regs->regs[44]) >> 32;
282	al = (regs->regs[44]) & 0xffffffff;
283	bh = (regs->regs[45]) >> 32;
284	bl = (regs->regs[45]) & 0xffffffff;
285	ch = (regs->regs[46]) >> 32;
286	cl = (regs->regs[46]) & 0xffffffff;
287	printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
288	ah, al, bh, bl, ch, cl);
289
290	ah = (regs->regs[47]) >> 32;
291	al = (regs->regs[47]) & 0xffffffff;
292	bh = (regs->regs[48]) >> 32;
293	bl = (regs->regs[48]) & 0xffffffff;
294	ch = (regs->regs[49]) >> 32;
295	cl = (regs->regs[49]) & 0xffffffff;
296	printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
297	ah, al, bh, bl, ch, cl);
298
299	ah = (regs->regs[50]) >> 32;
300	al = (regs->regs[50]) & 0xffffffff;
301	bh = (regs->regs[51]) >> 32;
302	bl = (regs->regs[51]) & 0xffffffff;
303	ch = (regs->regs[52]) >> 32;
304	cl = (regs->regs[52]) & 0xffffffff;
305	printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
306	ah, al, bh, bl, ch, cl);
307
308	ah = (regs->regs[53]) >> 32;
309	al = (regs->regs[53]) & 0xffffffff;
310	bh = (regs->regs[54]) >> 32;
311	bl = (regs->regs[54]) & 0xffffffff;
312	ch = (regs->regs[55]) >> 32;
313	cl = (regs->regs[55]) & 0xffffffff;
314	printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
315	ah, al, bh, bl, ch, cl);
316
317	ah = (regs->regs[56]) >> 32;
318	al = (regs->regs[56]) & 0xffffffff;
319	bh = (regs->regs[57]) >> 32;
320	bl = (regs->regs[57]) & 0xffffffff;
321	ch = (regs->regs[58]) >> 32;
322	cl = (regs->regs[58]) & 0xffffffff;
323	printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
324	ah, al, bh, bl, ch, cl);
325
326	ah = (regs->regs[59]) >> 32;
327	al = (regs->regs[59]) & 0xffffffff;
328	bh = (regs->regs[60]) >> 32;
329	bl = (regs->regs[60]) & 0xffffffff;
330	ch = (regs->regs[61]) >> 32;
331	cl = (regs->regs[61]) & 0xffffffff;
332	printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
333	ah, al, bh, bl, ch, cl);
334
335	ah = (regs->regs[62]) >> 32;
336	al = (regs->regs[62]) & 0xffffffff;
337	bh = (regs->tregs[0]) >> 32;
338	bl = (regs->tregs[0]) & 0xffffffff;
339	ch = (regs->tregs[1]) >> 32;
340	cl = (regs->tregs[1]) & 0xffffffff;
341	printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
342	ah, al, bh, bl, ch, cl);
343
344	ah = (regs->tregs[2]) >> 32;
345	al = (regs->tregs[2]) & 0xffffffff;
346	bh = (regs->tregs[3]) >> 32;
347	bl = (regs->tregs[3]) & 0xffffffff;
348	ch = (regs->tregs[4]) >> 32;
349	cl = (regs->tregs[4]) & 0xffffffff;
350	printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
351	ah, al, bh, bl, ch, cl);
352
353	ah = (regs->tregs[5]) >> 32;
354	al = (regs->tregs[5]) & 0xffffffff;
355	bh = (regs->tregs[6]) >> 32;
356	bl = (regs->tregs[6]) & 0xffffffff;
357	ch = (regs->tregs[7]) >> 32;
358	cl = (regs->tregs[7]) & 0xffffffff;
359	printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
360	ah, al, bh, bl, ch, cl);
361
362	/*
363	* If we're in kernel mode, dump the stack too..
364	*/
365	if (!user_mode(regs)) {
366	void show_stack(struct task_struct tsk, unsigned long sp);
367	unsigned long sp = regs->regs[15] & 0xffffffff;
368	struct task_struct *tsk = get_current();
369
370	tsk->thread.kregs = regs;
371
372	show_stack(tsk, (unsigned long *)sp);
373	}
374	}
375
376	struct task_struct * alloc_task_struct(void)
377	{
378	/* Get task descriptor pages */
379	return (struct task_struct *)
380	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE));
381	}
382
383	void free_task_struct(struct task_struct *p)
384	{
385	free_pages((unsigned long) p, get_order(THREAD_SIZE));
386	}
387
388	/*
389	* Create a kernel thread
390	*/
821278a7 AB	391	ATTRIB_NORET void kernel_thread_helper(void arg, int (fn)(void *))
	392	{
	393	do_exit(fn(arg));
	394	}
1da177e4 LT	395
	396	/*
	397	* This is the mechanism for creating a new kernel thread.
	398	*
	399	* NOTE! Only a kernel-only process(ie the swapper or direct descendants
	400	* who haven't done an "execve()") should use this: it will work within
	401	* a system call from a "real" process, but the process memory space will
0a354775	402	* not be freed until both the parent and the child have exited.
1da177e4 LT	403	*/
	404	int kernel_thread(int (fn)(void ), void * arg, unsigned long flags)
	405	{
821278a7	406	struct pt_regs regs;
1da177e4	407
821278a7 AB	408	memset(&regs, 0, sizeof(regs));
	409	regs.regs[2] = (unsigned long)arg;
	410	regs.regs[3] = (unsigned long)fn;
1da177e4	411
821278a7 AB	412	regs.pc = (unsigned long)kernel_thread_helper;
821278a7 AB	413	regs.sr = (1 << 30);
1da177e4	414
821278a7 AB	415	return do_fork(flags \| CLONE_VM \| CLONE_UNTRACED, 0,
821278a7 AB	416	&regs, 0, NULL, NULL);
1da177e4 LT	417	}
	418
	419	/*
	420	* Free current thread data structures etc..
	421	*/
	422	void exit_thread(void)
	423	{
	424	/* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC.
	425
	426	The SH-5 FPU save/restore approach relies on last_task_used_math
	427	pointing to a live task_struct. When another task tries to use the
	428	FPU for the 1st time, the FPUDIS trap handling (see
	429	arch/sh64/kernel/fpu.c) will save the existing FPU state to the
	430	FP regs field within last_task_used_math before re-loading the new
	431	task's FPU state (or initialising it if the FPU has been used
	432	before). So if last_task_used_math is stale, and its page has already been
	433	re-allocated for another use, the consequences are rather grim. Unless we
	434	null it here, there is no other path through which it would get safely
	435	nulled. */
	436
	437	#ifdef CONFIG_SH_FPU
	438	if (last_task_used_math == current) {
	439	last_task_used_math = NULL;
	440	}
	441	#endif
	442	}
	443
	444	void flush_thread(void)
	445	{
	446
	447	/* Called by fs/exec.c (flush_old_exec) to remove traces of a
	448	* previously running executable. */
	449	#ifdef CONFIG_SH_FPU
	450	if (last_task_used_math == current) {
	451	last_task_used_math = NULL;
	452	}
	453	/* Force FPU state to be reinitialised after exec */
	454	clear_used_math();
	455	#endif
	456
	457	/* if we are a kernel thread, about to change to user thread,
	458	* update kreg
	459	*/
	460	if(current->thread.kregs==&fake_swapper_regs) {
	461	current->thread.kregs =
	462	((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
	463	current->thread.uregs = current->thread.kregs;
	464	}
	465	}
	466
	467	void release_thread(struct task_struct *dead_task)
	468	{
	469	/* do nothing */
	470	}
	471
	472	/* Fill in the fpu structure for a core dump.. */
	473	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpu)
	474	{
	475	#ifdef CONFIG_SH_FPU
	476	int fpvalid;
	477	struct task_struct *tsk = current;
	478
	479	fpvalid = !!tsk_used_math(tsk);
	480	if (fpvalid) {
481	if (current == last_task_used_math) {
600ee240	482	enable_fpu();
332fd57b	483	save_fpu(tsk, regs);
600ee240	484	disable_fpu();
1da177e4 LT	485	last_task_used_math = 0;
	486	regs->sr \|= SR_FD;
	487	}
	488
	489	memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
	490	}
	491
	492	return fpvalid;
	493	#else
	494	return 0; /* Task didn't use the fpu at all. */
	495	#endif
	496	}
	497
	498	asmlinkage void ret_from_fork(void);
	499
	500	int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	501	unsigned long unused,
	502	struct task_struct p, struct pt_regs regs)
	503	{
	504	struct pt_regs *childregs;
	505	unsigned long long se; /* Sign extension */
	506
	507	#ifdef CONFIG_SH_FPU
	508	if(last_task_used_math == current) {
600ee240	509	enable_fpu();
332fd57b	510	save_fpu(current, regs);
600ee240	511	disable_fpu();
1da177e4 LT	512	last_task_used_math = NULL;
	513	regs->sr \|= SR_FD;
	514	}
	515	#endif
	516	/* Copy from sh version */
ee8c1dd4	517	childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
1da177e4 LT	518
	519	childregs = regs;
	520
	521	if (user_mode(regs)) {
	522	childregs->regs[15] = usp;
	523	p->thread.uregs = childregs;
	524	} else {
ee8c1dd4	525	childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE;
1da177e4 LT	526	}
	527
	528	childregs->regs[9] = 0; /* Set return value for child */
	529	childregs->sr \|= SR_FD; /* Invalidate FPU flag */
	530
	531	p->thread.sp = (unsigned long) childregs;
	532	p->thread.pc = (unsigned long) ret_from_fork;
	533
	534	/*
	535	* Sign extend the edited stack.
	536	* Note that thread.pc and thread.pc will stay
	537	* 32-bit wide and context switch must take care
	538	* of NEFF sign extension.
	539	*/
	540
	541	se = childregs->regs[15];
	542	se = (se & NEFF_SIGN) ? (se \| NEFF_MASK) : se;
	543	childregs->regs[15] = se;
	544
	545	return 0;
	546	}
	547
1da177e4 LT	548	asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
	549	unsigned long r4, unsigned long r5,
	550	unsigned long r6, unsigned long r7,
	551	struct pt_regs *pregs)
	552	{
	553	return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
	554	}
	555
	556	asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
	557	unsigned long r4, unsigned long r5,
	558	unsigned long r6, unsigned long r7,
	559	struct pt_regs *pregs)
	560	{
	561	if (!newsp)
	562	newsp = pregs->regs[15];
	563	return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
	564	}
	565
	566	/*
	567	* This is trivial, and on the face of it looks like it
	568	* could equally well be done in user mode.
	569	*
	570	* Not so, for quite unobvious reasons - register pressure.
	571	* In user mode vfork() cannot have a stack frame, and if
	572	* done by calling the "clone()" system call directly, you
	573	* do not have enough call-clobbered registers to hold all
	574	* the information you need.
	575	*/
	576	asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
	577	unsigned long r4, unsigned long r5,
	578	unsigned long r6, unsigned long r7,
	579	struct pt_regs *pregs)
	580	{
	581	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
	582	}
	583
	584	/*
	585	* sys_execve() executes a new program.
	586	*/
	587	asmlinkage int sys_execve(char ufilename, char *uargv,
	588	char **uenvp, unsigned long r5,
	589	unsigned long r6, unsigned long r7,
	590	struct pt_regs *pregs)
	591	{
	592	int error;
	593	char *filename;
	594
	595	lock_kernel();
	596	filename = getname((char __user *)ufilename);
	597	error = PTR_ERR(filename);
	598	if (IS_ERR(filename))
	599	goto out;
	600
	601	error = do_execve(filename,
	602	(char __user * __user *)uargv,
	603	(char __user * __user *)uenvp,
	604	pregs);
	605	if (error == 0) {
	606	task_lock(current);
	607	current->ptrace &= ~PT_DTRACE;
	608	task_unlock(current);
	609	}
	610	putname(filename);
	611	out:
612	unlock_kernel();
613	return error;
614	}
615
616	/*
617	* These bracket the sleeping functions..
618	*/
619	extern void interruptible_sleep_on(wait_queue_head_t *q);
620
621	#define mid_sched ((unsigned long) interruptible_sleep_on)
622
623	static int in_sh64_switch_to(unsigned long pc)
624	{
625	extern char __sh64_switch_to_end;
626	/* For a sleeping task, the PC is somewhere in the middle of the function,
627	so we don't have to worry about masking the LSB off */
628	return (pc >= (unsigned long) sh64_switch_to) &&
629	(pc < (unsigned long) &__sh64_switch_to_end);
630	}
631
632	unsigned long get_wchan(struct task_struct *p)
633	{
634	unsigned long schedule_fp;
635	unsigned long sh64_switch_to_fp;
636	unsigned long schedule_caller_pc;
637	unsigned long pc;
638
639	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
640	return 0;
641
642	/*
643	* The same comment as on the Alpha applies here, too ...
644	*/
645	pc = thread_saved_pc(p);
646
647	#ifdef CONFIG_FRAME_POINTER
648	if (in_sh64_switch_to(pc)) {
649	sh64_switch_to_fp = (long) p->thread.sp;
650	/* r14 is saved at offset 4 in the sh64_switch_to frame */
651	schedule_fp = (unsigned long ) (long)(sh64_switch_to_fp + 4);
652
653	/* and the caller of 'schedule' is (currently!) saved at offset 24
654	in the frame of schedule (from disasm) */
655	schedule_caller_pc = (unsigned long ) (long)(schedule_fp + 24);
656	return schedule_caller_pc;
657	}
658	#endif
659	return pc;
660	}
661
662	/* Provide a /proc/asids file that lists out the
663	ASIDs currently associated with the processes. (If the DM.PC register is
664	examined through the debug link, this shows ASID + PC. To make use of this,
665	the PID->ASID relationship needs to be known. This is primarily for
666	debugging.)
667	*/
668
669	#if defined(CONFIG_SH64_PROC_ASIDS)
1da177e4 LT	670	static int
	671	asids_proc_info(char buf, char start, off_t fpos, int length, int eof, void *data)
	672	{
	673	int len=0;
	674	struct task_struct *p;
	675	read_lock(&tasklist_lock);
	676	for_each_process(p) {
	677	int pid = p->pid;
df0fb256 PM	678
	679	if (!pid)
	680	continue;
	681	if (p->mm)
	682	len += sprintf(buf+len, "%5d : %02lx\n", pid,
	683	asid_cache(smp_processor_id()));
	684	else
1da177e4	685	len += sprintf(buf+len, "%5d : (none)\n", pid);
1da177e4 LT	686	}
	687	read_unlock(&tasklist_lock);
	688	*eof = 1;
	689	return len;
	690	}
	691
	692	static int __init register_proc_asids(void)
	693	{
c26056bc PM	694	create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL);
c26056bc PM	695	return 0;
1da177e4	696	}
1da177e4 LT	697	__initcall(register_proc_asids);
1da177e4 LT	698	#endif