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h8300: generic kernel_thread()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-10-10 13:17:31 -04:00
parent ddffeb8c4d
commit 557e1995a9
6 changed files with 21 additions and 36 deletions
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41
arch/h8300/kernel/process.c
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@@ -47,6 +47,7 @@ void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
/*
* The idle loop on an H8/300..
@@ -122,39 +123,6 @@ void show_regs(struct pt_regs * regs)
printk("\n");
}
/*
* Create a kernel thread
*/
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
long retval;
long clone_arg;
mm_segment_t fs;
fs = get_fs();
set_fs (KERNEL_DS);
clone_arg = flags | CLONE_VM;
__asm__("mov.l sp,er3\n\t"
"sub.l er2,er2\n\t"
"mov.l %2,er1\n\t"
"mov.l %1,er0\n\t"
"trapa #0\n\t"
"cmp.l sp,er3\n\t"
"beq 1f\n\t"
"mov.l %4,er0\n\t"
"mov.l %3,er1\n\t"
"jsr @er1\n\t"
"mov.l %5,er0\n\t"
"trapa #0\n"
"1:\n\t"
"mov.l er0,%0"
:"=r"(retval)
:"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
:"er0","er1","er2","er3");
set_fs (fs);
return retval;
}
void flush_thread(void)
{
}
@@ -198,6 +166,13 @@ int copy_thread(unsigned long clone_flags,
childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->retpc = (unsigned long) ret_from_kernel_thread;
childregs->er4 = topstk; /* arg */
childregs->er5 = usp; /* fn */
p->thread.ksp = (unsigned long)childregs;
}
*childregs = *regs;
childregs->retpc = (unsigned long) ret_from_fork;
childregs->er0 = 0;