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Subjectkernel_thread bogosity
Hi!

You see? Kernel_thread does not check is sys_clone() worked! Aha,
caller is responsible for that, but init/main.c does not seem too
carefull. Maybe kernel_thread should at least print a warning?

Plus, can someone explain me why it does not need to setup %%ecx with
either zero or address of stack?
Pavel

int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
long retval, d0;

__asm__ __volatile__(
"movl %%esp,%%esi\n\t"
"int $0x80\n\t" /* Linux/i386 system call */
"cmpl %%esp,%%esi\n\t" /* child or parent? */
"je 1f\n\t" /* parent - jump */
/* Load the argument into eax, and push it. That way,
it does
* not matter whether the called function is compiled
with
* -mregparm or not. */
"movl %4,%%eax\n\t"
"pushl %%eax\n\t"
"call *%5\n\t" /* call fn */
"movl %3,%0\n\t" /* exit */
"int $0x80\n"
"1:\t"
:"=&a" (retval), "=&S" (d0)
:"0" (__NR_clone), "i" (__NR_exit),
"r" (arg), "r" (fn),
"b" (flags | CLONE_VM)
: "memory");
return retval;
}

--
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
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